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Versions: 00 01 02 03 04 05 rfc2558                                     
          Internet Draft        SONET/SDH Objects      September 1, 1998
          
          
                          Definitions of Managed Objects
                         for the SONET/SDH Interface Type
          
                                September 1, 1998
          
          
                              AToM MIB Working Group
          
                                    Kaj Tesink
                                     Bellcore
                             331 Newman Springs Road
                               Red Bank, NJ  07701
          
                               kaj@cc.bellcore.com
          
          
          
          
          1.  Status of this Memo
          
          This document is an Internet-Draft.  Internet-Drafts are
          working documents of the Internet Engineering Task Force
          (IETF), its areas, and its working groups.  Note that other
          groups may also distribute working documents as Internet-
          Drafts.
          
          Internet-Drafts are draft documents valid for a maximum of six
          months and may be updated, replaced, or obsoleted by other
          documents at any time.  It is inappropriate to use Internet-
          Drafts as reference material or to cite them other than as
          ``work in progress.''
          
          To learn the current status of any Internet-Draft, please
          check the ``1id-abstracts.txt'' listing contained in the
          Internet- Drafts Shadow Directories on ftp.ietf.org (US East
          Coast), nic.nordu.net (Europe), ftp.isi.edu (US West Coast),
          or munnari.oz.au (Pacific Rim).
          
          Copyright Notice
          
          Copyright (C) The Internet Society (1998).  All Rights
          Reserved.
          
          
          
          
          
          
          
          
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          Internet Draft        SONET/SDH Objects      September 1, 1998
          
          
          2.  Abstract
          
          This memo defines a portion of the Management Information Base
          (MIB) for use with network management protocols in TCP/IP-
          based internets.  In particular, it defines objects for
          managing Synchronous Optical Network/Synchronous Digital
          Hierarchy (SONET/SDH) interfaces.  This document is a
          companion to the documents that define Managed Objects for the
          DS1/E1/DS2/E2 and DS3/E3 Interface Types [24][25].
          
          This memo specifies a MIB module in a manner that is both
          compliant to the SNMPv2 SMI, and semantically identical to the
          peer SNMPv1 definitions.
          
          Textual Conventions used in this MIB are defined in [6] and
          [36].
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          Internet Draft        SONET/SDH Objects      September 1, 1998
          
          
          3.  The SNMP Network Management Framework
          
          The SNMP Management Framework presently consists of five major
          components:
          
          0    An overall architecture, described in RFC 2271 [1].
          
          0    Mechanisms for describing and naming objects and events
               for the purpose of management.  The first version of this
               Structure of Management Information (SMI) is called SMIv1
               and described in RFC 1155 [2], RFC 1212 [3] and RFC 1215
               [4].  The second version, called SMIv2, is described in
               RFC 1902 [5], RFC 1903 [6] and RFC 1904 [7].
          
          0    Message protocols for transferring management
               information.  The first version of the SNMP message
               protocol is called SNMPv1 and described in RFC 1157 [8].
               A second version of the SNMP message protocol, which is
               not an Internet standards track protocol, is called
               SNMPv2c and described in RFC 1901 [9] and RFC 1906 [10].
               The third version of the message protocol is called
               SNMPv3 and described in RFC 1906 [10], RFC 2272 [11] and
               RFC 2274 [12].
          
          0    Protocol operations for accessing management information.
               The first set of protocol operations and associated PDU
               formats is described in RFC 1157 [8].  A second set of
               protocol operations and associated PDU formats is
               described in RFC 1905 [13].
          
          0    A set of fundamental applications described in RFC 2273
               [14] and the view-based access control mechanism
               described in RFC 2275 [15].
          
          Managed objects are accessed via a virtual information store,
          termed the Management Information Base or MIB.  Objects in the
          MIB are defined using the mechanisms defined in the SMI.
          
          This memo specifies a MIB module that is compliant to the
          SMIv2.  A MIB conforming to the SMIv1 can be produced through
          the appropriate translations.  The resulting translated MIB
          must be semantically equivalent, except where objects or
          events are omitted because no translation is possible (e.g.,
          use of Counter64).  Some machine readable information in SMIv2
          will be converted into textual descriptions in SMIv1 during
          
          
          
          
          
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          Internet Draft        SONET/SDH Objects      September 1, 1998
          
          
          the translation process.  However, this loss of machine
          readable information is not considered to change the semantics
          of the MIB.
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          Internet Draft        SONET/SDH Objects      September 1, 1998
          
          
          4.  Overview
          
          These objects are used when the particular media being used to
          realize an interface is a SONET/SDH interface.  At present,
          this applies to these values of the ifType variable in the
          Internet-standard MIB:
          
               sonet (39), sonetPath (50), sonetVT (51)
          
          The definitions contained herein are based on the SONET/SDH
          specifications in ANSI T1.105 and T1.106-1988 [19][20][21] and
          CCITT G.707, 708, 709, and G.783 [26][27][28][29].
          
          4.1.  Use of the ifTable
          
          This section specifies how the MIB II interfaces group, as
          defined in [23], is used for SONET/SDH interfaces.  The
          SONET/SDH layers support several multiplexing possibilities.
          
          For example in SONET, an Synchronous Transport Signal 3 (STS-
          3) has 3 SONET Paths, and a STS-3c has 1 SONET Path. Another
          example could be a STS-12 having 4 SONET STS-3c Paths.
          Similarly, a SONET Synchronous Payload Envelope (SPE) can
          carry many Virtual Tributaries (VTs), for example, one SONET
          SPE can carry 28 VT1.5s.  It is important to note that an SPE
          and a VT in SONET is collectively referred to as a Virtual
          Container (VC) in SDH.  Also, an STS is called Synchronous
          Transport Module (STM) in SDH.
          
          Not all SONET/SDH equipment terminate all SONET/SDH layers.
          For example, an SONET/SDH STE regenerator terminates SONET/SDH
          Sections only, and is transparent for all layers above that.
          SONET/SDH Add-Drop multiplexers and Digital Cross Connect
          Systems terminate SONET/SDH Lines. SONET/SDH Terminal
          Multiplexers may also terminate SONET/SDH Paths and VTs/VCs.
          
          MIB II [16], as extended by [23], accommodates these cases by
          appropriate use of the MIB II system group, and the interfaces
          group. The system group can name and describe the type of
          managed resource. The interfaces group defines which SONET/SDH
          layers apply, how these layers are configured and multiplexed.
          This is achieved by proper representation of SONET/SDH Layers
          by ifEntries as defined in [23], as follows:
          
          
          
          
          
          
          
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          Internet Draft        SONET/SDH Objects      September 1, 1998
          
          
                        _____________________________
                       |             |          |    |  >
                       |             |          |    |  |
                       |    VT 1     |..........|VT K|   > K ifEntries
                       |             |          |    |  |
                       |_____________|__________|____|  >
                       |               |      |      |  >
                       |               |      |      |  |
                       |    Path 1     |......|Path L|   > L ifEntries
                       |               |      |      |  |
                       |_______________|______|______|  >
                       |                             |  >
                       |                             |  |
                       |    Line                     |  |
                       |                             |  |
                       |_____________________________|  |
                       |                             |  |
                       |                             |  |
                       |    Section Layer            |   > 1 ifEntry
                       |                             |  |
                       |_____________________________|  |
                       |                             |  |
                       |                             |  |
                       |    Physical Medium Layer    |  |
                       |                             |  |
                       |_____________________________|  >
          
                       Use of ifTable for a SONET/SDH port
          
          The exact configuration and multiplexing of the layers is
          maintained in the ifStackTable [23].
          
          4.2.  Use of ifTable for SONET/SDH Medium/Section/Line Layer
          
          Only the ifGeneralInformationGroup needs to be supported.
          
          ifTable Object    Use for combined SONET/SDH
                            Medium/Section/Line Layer
          ======================================================================
           ifIndex           Interface index.
          
           ifDescr           SONET/SDH Medium/Section/Line
          
           ifType            sonet(39)
          
          
          
          
          
          
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          Internet Draft        SONET/SDH Objects      September 1, 1998
          
          
           ifSpeed           Speed of line rate for SONET/SDH,
                             (e.g., 155520000 bps).
          
           ifPhysAddress     The value of the Circuit Identifier.
                             If no Circuit Identifier has been assigned
                             this object should have an octet string with
                             zero length.
          
           ifAdminStatus     Supports read-only access.
                             The desired administrative status of the
                             interface.
          
           ifOperStatus      The value testing(3) is not used.
                             This object assumes the value down(2),
                             if the objects sonetSectionCurrentStatus
                             and sonetLineCurrentStatus have
                             any other value than sonetSectionNoDefect(1)
                             and sonetLineNoDefect(1), respectively.
          
           ifLastChange      sysUpTime at the last change in ifOperStatus.
          
           ifName            Textual name of the interface or an OCTET STRING
                             of zero length.
          
           ifLinkUpDownTrapEnable   Set to enabled(1).
                                    Supports read-only access.
          
           ifHighSpeed       Speed of line in Mega-bits per second
                             (e.g., 155 Mbps)
          
           ifConnectorPresent Set to true(1).
          
           ifAlias            The (non-volatile) alias name for this interface
                              as assigned by the network manager.
          
          4.3.  Use of ifTable for SONET/SDH Paths
          
          Only the ifGeneralInformationGroup needs to be supported.
          
          ifTable Object    Use for SONET/SDH Paths
          =========================================
           ifIndex           Interface index.
          
           ifDescr           SONET/SDH Path
          
          
          
          
          
          
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          Internet Draft        SONET/SDH Objects      September 1, 1998
          
          
           ifType            sonetPath(50)
          
           ifSpeed           set to speed of SONET/SDH path
                             (e.g., an STS-1 path has a
                             rate of 50112000 bps.)
          
           ifPhysAddress     Circuit Identifier or OCTET STRING of zero length.
          
           ifAdminStatus     Supports read-only access.
                             The desired administrative status of the
                             interface.
          
           ifOperStatus      This object assumes the value down(2),
                             if the object sonetPathCurrentStatus has
                             any other value than sonetPathNoDefect(1).
          
           ifLastChange      sysUpTime at the last change in ifOperStatus.
          
           ifName            Textual name of the interface or an OCTET STRING
                             of zero length.
          
           ifLinkUpDownTrapEnable   Default value is disabled(2).
                                    Just read-only access may be supported.
          
           ifHighSpeed       Set to rate of SONET/SDH path
                             in Mega-bits per second.
          
           ifConnectorPresent Set to false(2).
          
           ifAlias            The (non-volatile) alias name for this interface
                              as assigned by the network manager.
          
          
          4.4.  Use of ifTable for SONET/SDH VTs/VCs
          
          Only the ifGeneralInformationGroup needs to be supported.
          
          ifTable Object    Use for SONET/SDH VTs/VCs
          ===========================================
           ifIndex           Interface index.
          
           ifDescr           SONET/SDH VT/VC
          
           ifType            sonetVT(51)
          
          
          
          
          
          
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          Internet Draft        SONET/SDH Objects      September 1, 1998
          
          
           ifSpeed           Set to speed of VT/VC
                             (e.g., a VT1.5 has a rate of
                             1728000 bps.)
          
           ifPhysAddress     Circuit Identifier or OCTET STRING of zero length.
          
           ifAdminStatus     Supports read-only access.
                             The desired administrative status of the
                             interface.
          
           ifOperStatus      This object assumes the value down(2),
                             if the object sonetVTCurrentStatus has
                             any other value than sonetVTNoDefect(1).
          
           ifLastChange      sysUpTime at the last change in ifOperStatus.
          
           ifName            Textual name of the interface or an OCTET STRING
                             of zero length.
          
           ifLinkUpDownTrapEnable   Default value is disabled(2).
                                    Just read-only access may be supported.
          
           ifHighSpeed       Set to rate of VT in Mega-bits per second.
          
           ifConnectorPresent Set to false(2).
          
           ifAlias            The (non-volatile) alias name for this interface
                              as assigned by the network manager.
          
          
          4.5.  SONET/SDH Terminology
          
          The terminology used in this document to describe error
          conditions on a SONET circuit as monitored by a SONET system
          are from the T1.231 [22][31][35].  The terminology used in
          this document to describe error conditions on a SDH circuit as
          monitored by a SDH system are from the CCITT G.783 [29].  Only
          the SONET Performance Monitoring terminology is defined in
          this document.  The definitions for SDH Performance Monitoring
          terms are similar but not identical, and they can be found in
          [29].  If the definition in this document does not match the
          definition in the T1.231 document, the implementer should
          follow the definition described in this document.  In some
          cases other or additional references are used as compared with
          the ones cited above. This will be indicated in the text.
          
          
          
          
          
          Expires 3/1/1999                                      [Page 9]


          Internet Draft        SONET/SDH Objects      September 1, 1998
          
          
          Section Loss Of Frame Failure (Out of Frame Event, Severely
               Errored Frame Defect)
               An Out of Frame (OOF) event (or Severely Errored Frame
               defect) is the occurrence of four contiguous errored
               frame alignment words.  A frame alignment work occupies
               the A1 and A2 bytes of an STS frame, and is defined in
               T1.105.  The SEF defect is terminated when two contiguous
               error-free frame words are detected.  Any implementation
               of the frame recovery circuitry which achieves
               realignment following an OOF within the 250 microsecond
               (two frames) interval implied by this definition is
               acceptable.
          
               A Loss of Frame (LOF) defect is declared when an OOF/SEF
               defect persists for a period of 3 milliseconds.  The LOF
               defect is terminated when the incoming signal remains
               continuously in-frame for a period of 1 ms to 3 ms.
          
               A LOF failure is declared when the LOF defect persists
               for a period of 2.5 +/- 0.5 seconds, except when an LOS
               defect or failure is present.  The LOF failure is cleared
               when the LOS failure is declared, or when the LOF defect
               is absent for 10 +/- 0.5 seconds.
          
          Loss of Signal
               The Loss of Signal (LOS) defect is declared when no
               transitions are detected on the incoming signal (before
               descrambling).  The LOS defect is detected  upon
               observing 2.3 to 100 microseconds of no transitions.  The
               LOS defect is cleared after a 125 microsecond interval
               (one frame) during which no LOS defect is detected.
          
               The LOS failure is declared when the LOS defect persists
               for a period of 2.5 +/- 0.5 seconds, or if LOS defect is
               present when the criteria for LOF failure declaration
               have been met.  The LOS failure is cleared when the LOS
               defect is absent for a period of 10 +/- 0.5 seconds.
               Declaration of LOS failure clears any existing LOF
               failure.  Clearing the LOS failure allows immediate
               declaration of the LOF failure if conditions warrant.
          
          STS-Path Loss of Pointer
               A Loss of Pointer (LOP) defect is declared when either a
               valid pointer is not detected in eight consecutive
               frames, or when eight consecutive frames are detected
          
          
          
          
          
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          Internet Draft        SONET/SDH Objects      September 1, 1998
          
          
               with the New Data Flag (NDF) set to "1001" without a
               valid concatenation indicator (see ANSI T1.105).  A LOP
               defect is terminated when either a valid pointer with a
               normal NDF set to "0110", or a valid concatenation
               indicator is detected for three contiguous frames.
               Incoming STS-Path AIS shall not result in the declaration
               of a LOP defect.
          
               An STS-Path LOP failure is declared when the STS-Path LOP
               defect persists for a period of 2.5 +/- 0.5 seconds.  A
               STS-Path LOP failure is cleared when the STS-Path LOP
               defect is absent for 10 +/- 0.5 seconds.
          
          VT Loss of Pointer
               A VT LOP defect is declared when either a valid pointer
               is not detected in eight consecutive VT superframes, or
               when eight consecutive VT superframes are detected with
               the NDF set to "1001" without a valid concatenation
               indicator.  A VT LOP defect is terminated when either a
               valid pointer with a normal NDF set to "0110", or a valid
               concatenation indicator is detected for three contiguous
               VT superframes.  Incoming VT-Path AIS shall not result in
               declaring a VT LOP defect.
          
               A VT LOP failure is declared when the VT LOP defect
               persists for 2.5 +/- 0.5 seconds.  A VT LOP failure is
               cleared when the VT LOP defect is absent for 10 +/- 0.5
               seconds.
          
          Line Alarm Indication Signal
               A Line Alarm Indication Signal (L-AIS) is defined in ANSI
               T1.105.  The following criteria are specific to the L-AIS
               defect:
          
               --  Line AIS defect is detected as a "111" pattern in
               bits 6, 7, and 8 of the K2 byte in five consecutive
               frames.
          
               --  Line AIS defect is terminated when bits 6, 7, and 8
               of the K2 byte do not contain the code "111" for five
               consecutive frames.
          
               A Line AIS failure is declared when the Line AIS defect
               persists for a period of 20.5 +/- 0.5 seconds.  A Line
               AIS failure is cleared when the Line AIS defect is absent
          
          
          
          
          
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          Internet Draft        SONET/SDH Objects      September 1, 1998
          
          
               for 10 +/- 0.5 seconds.
          
          STS-Path Alarm Indication Signal
               The STS-Path Alarm Indication Signal (AIS) is defined in
               ANSI T1.105 as all ones in bytes H1, H2, and H3 as well
               as all ones in the entire STS SPE.  The following
               criteria are specific to the STS-Path AIS defect:
          
               -- STS-Path AIS defect is detected as all ones in bytes
               H1 and H2 in three contiguous frames.
          
               -- The STS-Path AIS defect is terminated when a valid STS
               Pointer is detected with the NDF set to "1001" (inverted)
               for one frame, or  "0110" (normal) for three contiguous
               frames.
          
               An STS-Path AIS failure is declared when the STS-Path AIS
               defect persists for 2.5 +/- 0.5 seconds.  An STS-Path AIS
               failure is cleared when the STS-Path AIS defect is absent
               for 10 +/- 0.5 seconds.
          
          VT-Path Alarm Indication Signal
               The VT-Path Alarm Indication Signal (AIS) is only
               applicable for VTs in the floating mode of operation.
               VT-Path AIS is used to alert the downstream VT Path
               Terminating Entity (PTE) of an upstream failure.  Upon
               detection of a failure, Line AIS, or STS-Path AIS, an STS
               PTE will generate downstream VT-Path AIS if the STS
               Synchronous Payload Envelope (SPE) is carrying floating
               VTs.  VT-Path AIS is specified in ANSI T1.105 as all ones
               in bytes V1, V2, V3, and V4, as well as all ones in the
               entire VT SPE.  The following criteria are specific to
               VT-Path AIS defect:
          
               --  VT-Path AIS defect is detected by a VT PTE as all
               ones in bytes V1 and V2 in three contiguous VT
               superframes.
          
               --  VT-Path AIS defect is terminated when valid VT
               pointer with a valid VT size is detected with the NDF set
               to "1001" (inverted) for one VT superframe, or "0110"
               (normal) for three contiguous VT superframes are
               detected.
          
               A VT-Path AIS failure is declared when the VT-Path AIS
          
          
          
          
          
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               defect persists for 2.5 +/- 0.5 seconds.  A VT-Path AIS
               failure is cleared when the VT-Path AIS defect is absent
               for 10 +/- 0.5 seconds.
          
          Line Remote Defect Indication
               Line Remote Defect Indication (RDI) (aka Line FERF)
               signal is the occurrence of a "110" pattern in bit
               positions 6, 7, and 8 of the K2 byte in STS-1 #1 of the
               STS-N signal.  Line RDI is defined in ANSI T1.105.  The
               following criteria are specific to Line RDI defect:
          
               --  Line RDI defect is a "110" code in bits 6, 7, and 8
               of the K2 byte of in STS-1 #1 in x consecutive frames,
               where x = 5 [31][35] or 10 [35].
          
               --  Line RDI defect is terminated when any code other
               than "110" is detected in bits 6, 7, and 8 of the K2 byte
               in x consecutive frames, where x = 5 [31][35] or 10 [35].
          
               A Line Remote Failure Indication (RFI) failure is
               declared when the incoming Line RDI defects lasts for 2.5
               +/- 0.5 seconds.  The Line RFI failure is cleared when no
               Line RDI defects are detected for 10 +/- 0.5 seconds.
          
          STS-Path Remote Defect Indication
               STS-Path RDI (aka STS-Path FERF) signal shall be
               generated within 100 milliseconds by the STS PTE upon
               detection of an AIS or LOP defect.  Transmission of the
               STS-Path RDI signal shall cease within 100 milliseconds
               when the STS PTE no longer detects STS-Path AIS or STS-
               Path LOP defect.  The STS-Path RDI  shall accurately
               report the presence or absence of STS-Path AIS or STS-
               Path LOP defects.  STS-Path RDI defect is defined in ANSI
               T1.105.  The following requirements are specific to the
               STS-Path RDI defect:
          
               --  STS-Path RDI is detected by all STS PTEs.  STS-Path
               RDI is detected by the upstream STS PTE as a "1" in bit
               five of the Path Status byte (G1) for x consecutive
               frames, where x = 5 [31] or 10 [35].
          
               --  Removal of STS-Path Remote Defect Indication is
               detected by a "0" in bit 5 of the G1 byte in x
               consecutive frames, where x = 5 [31] or 10 [35].
          
          
          
          
          
          
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               An STS-Path Remote Failure Indication (RFI) failure is
               declared when the incoming STS-Path RDI defects lasts for
               2.5 +/- 0.5 seconds.  The STS-Path RFI failure is cleared
               when no STS-Path RDI defects are detected for 10 +/- 0.5
               seconds.
          
          VT-Path Remote Defect Indication
               VT Path RDI (aka VT Path FERF) signal shall be generated
               within 100 milliseconds by the VT PTE upon detection of a
               VT-Path AIS or LOP defect.  Transmission of the VT-Path
               RDI signal shall cease within 100 milliseconds when the
               VT PTE no longer detects VT-Path AIS or VT-Path LOP
               defect.  The VT-Path RDI  shall accurately report the
               presence or absence of VT-Path AIS or VT-Path LOP
               defects.  VT-Path RDI defect is defined in ANSI T1.105.
               The following requirements are specific to VT-Path RDI
               defect:
          
               --  VT-Path RDI defect is the occurrence of a "1" in bit
               4 of the VT-Path Overhead byte (V5) in x consecutive
               frames, where x = 5 [31] or 10 [35].
          
               --  VT-Path RDI defect is terminated when a "0" is
               detected in bit 4 of the VT-Path Overhead byte (V5) for x
               consecutive frames, where x = 5 [31] or 10 [35].
          
               A VT-Path Remote Failure Indication (RFI) (derived)
               failure is declared when the incoming VT-Path RDI defects
               lasts for 2.5 +/- 0.5 seconds.  The VT-Path RFI failure
               is cleared when no VT-Path RDI defects are detected for
               10 +/- 0.5 seconds.
          
          VT-Path Remote Failure Indication
               The VT-Path RFI signal is only required for the case of
               byte synch mapped DS1s where the DS1 frame bit is not
               mapped.  The VT-Path RFI is specified in ANSI T1.105,
               where it is currently called VT path yellow.  When
               provided, the VT-Path RFI signal is used to indicate the
               occurrence of far-end failures.  When the VT-Path RFI is
               not provided, far-end failures are derived from local
               timing of the VT-Path RDI defect.  The VT-Path RFI
               failure is declared within 5 ms of detecting the incoming
               VT-Path RFI Signal.  The VT-Path Remote Failure
               Indication (RFI) failure is cleared within 50 ms of
               detecting the removal of the incoming VT-Path RFI signal.
          
          
          
          
          
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          Coding Violation
               Coding Violations (CV) are Bit Interleaved Parity (BIP)
               errors that are detected in the incoming signal.  CV
               counters are incremented for each BIP error detected.
               That is, each BIP-8 can detect up to eight errors per
               STS-N frame, with each error incrementing the CV counter.
               Section CVs shall be collected using the BIP-8 in the B1
               byte located in the Section Overhead of STS-1 #1.  Line
               CVs shall be collected using the BIP-8s in B2 bytes
               located in the Line Overhead of each STS-1 (since all CVs
               on an STS-N line are counted together, this is equivalent
               to counting each error in the BIP-8*N contained in the B2
               bytes of the STS-N Line Overhead).  Thus, on an STS-N
               signal, up to 8 x N CVs may occur in each frame.  Path
               CVs shall be collected using the BIP-8 in the B3 byte of
               the STS-Path Overhead of the STS SPE.  VT CVs shall be
               collected using the BIP-2 in the V5 overhead byte of the
               floating VT.
          
          Errored Seconds
               At each layer, an Errored Second (ES) is a second with
               one or more Coding Violations at that layer OR one or
               more incoming defects (e.g., SEF, LOS, AIS, LOP) at that
               layer has occurred.
          
          Severely Errored Seconds
               According to [22][31][32][34][35] at each layer, an
               Severely Errored Second (SES) is a second with x or more
               CVs at that layer, or a second during which at least one
               or more incoming defects at that layer has occurred.  The
               values of x  in RFC1595[30] were based on [22] and [32]
               (see Appendix B). These values have subsequently been
               relaxed in [31][34][35]. In addition, according to G.826
               [33] SESs are measured as a percentage of errored blocks.
          
               To deal with these sets of definitions this memo defines
               an object sonetSESThresholdSet that determines the
               correct interpretation of SES. For backward
               compatibility, if this object is not implemented the
               interpretation of Appendix B shall apply.  Otherwise, a
               more recent interpretation is suggested.  An agent is not
               required to support all sets of definitions.
          
               Note that if a manager changes the value of this object
               all SES statistics collected prior to this change shall
          
          
          
          
          
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               be invalidated.
          
          Severely Errored Framing Seconds
               A Severely Errored Framing Second (SEFS) is a seconds
               with containing one or more SEF events.  This counter is
               only counted at the Section Layer.
          
          Unavailable Seconds
               At the Line, Path, and VT layers, an unavailable second
               is calculated by counting the number of seconds that the
               interface is unavailable.  At each layer, the SONET/SDH
               interface is said to be unavailable at the onset of 10
               contiguous SESs.  The 10 SESs are included in unavailable
               time.  Once unavailable, the SONET/SDH interface becomes
               available at the onset of 10 contiguous seconds with no
               SESs.  The 10 seconds with no SESs are excluded from
               unavailable time.  With respect to the SONET/SDH error
               counts at each layer, all counters at that layer are
               incremented while the SONET/SDH interface is deemed
               available at that layer.  While the interface is deemed
               unavailable at that layer, the only count that is
               incremented is UASs at that layer.
          
               Note that this definition implies that the agent cannot
               determine until after a ten second interval has passed
               whether a given one-second interval belongs to available
               or unavailable time.  If the agent chooses to update the
               various performance statistics in real time then it must
               be prepared to retroactively reduce the ES, SES, and SEFS
               counts by 10 and increase the UAS count by 10 when it
               determines that available time has been entered.  It must
               also be prepared to reduce the CV count by the number of
               violations counted since the onset of unavailable time.
               The agent must be similarly prepared to retroactively
               decrease the UAS count by 10 and increase the ES and CV
               counts as necessary upon entering available time.  A
               special case exists when the 10 second period leading to
               available or unavailable time crosses a 900 second
               statistics window boundary, as the foregoing description
               implies that the CV, ES, SES, SEFS, and UAS counts the
               PREVIOUS interval must be adjusted.  In this case
               successive GETs of the affected sonetPathIntervalSES and
               sonetPathIntervalUAS objects (and the analogous Line and
               VT objects also) objects will return differing values if
               the first GET occurs during the first few seconds of the
          
          
          
          
          
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               window.
          
               According to ANSI T1.231 unavailable time begins at the
               _onset_ of 10 contiguous severely errored seconds -- that
               is, unavailable time starts with the _first_ of the 10
               contiguous SESs.  Also, while an interface is deemed
               unavailable all counters for that interface are frozen
               except for the UAS count.  It follows that an
               implementation which strictly complies with this standard
               must _not_ increment any counters other than the UAS
               count -- even temporarily -- as a result of anything that
               happens during those 10 seconds.  Since changes in the
               signal state lag the data to which they apply by 10
               seconds, an ANSI-compliant implementation must pass the
               one-second statistics through a 10-second delay line
               prior to updating any counters.  That can be done by
               performing the following steps at the end of each one
               second interval.
          
          i)   Read near/far end CV counter and alarm status flags from
               the hardware.
          
          ii)  Accumulate the CV counts for the preceding second and
               compare them to the ES and SES threshold for the layer in
               question.  Update the signal state and shift the one-
               second CV counts and ES/SES flags into the 10-element
               delay line.  Note that far-end one-second statistics are
               to be flagged as "absent" during any second in which
               there is an incoming defect at the layer in question or
               at any lower layer.
          
          iii) Update the current interval statistics using the signal
               state from the _previous_ update cycle and the one-second
               CV counts and ES/SES flags shifted out of the 10-element
               delay line.
          
               This approach is further described in Appendix A. An
               agent may choose to use this approach in lieu of
               retroactive adjustments to the counters.
          
               In any case, a linkDown trap shall be sent only after the
               agent has determined for certain that the unavailable
               state has been entered, but the time on the trap will be
               that of the first UAS (i.e., 10 seconds earlier).  A
               linkUp trap shall be handled similarly.
          
          
          
          
          
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          Unequipped
               If a Path or VT connection is not provisioned (idle) the
               SONET equipment will signal this state by transmitting
               the Path or VT Signal Label as follows:
               - byte C2 of the STS Path Overhead equal to 0 for an
               unequipped Path,
               - byte V5 of the VT Path Overhead equal to 0 for an
               unequipped VT.
          
          Signal Label Mismatch
               A Path or VT connection is not correctly provisioned if a
               received Path or VT Signal Label mismatch occurs.  A
               received Signal Label is considered mismatched if it does
               not equal either the locally provisioned value or the
               value 'equipped non-specific' (1 hex). Note that any
               received non-zero Signal Label is considered a locally
               provisioned value of 'equipped non-specific'.  Only in-
               service, provisioned Path Terminating equipment can
               detect mismatched Signal labels. It is considered
               provisioned if it has been configured for a mapping and
               has been assigned signals to and from which the mapping
               takes place.  While a Path is unequipped or has
               mismatched signal labels ES/SES counts continue, but
               these conditions do not themselves contribute to ES/SES.
          
          Circuit Identifier
               This is a character string specified by the circuit
               vendor, and is useful when communicating with the vendor
               during the troubleshooting process.
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          5.  Object Definitions
          
          SONET-MIB DEFINITIONS ::= BEGIN
          
          
          IMPORTS
              MODULE-IDENTITY, OBJECT-TYPE,
              Integer32, transmission
                    FROM SNMPv2-SMI
              DisplayString, TruthValue
                    FROM SNMPv2-TC
              MODULE-COMPLIANCE, OBJECT-GROUP
                    FROM SNMPv2-CONF
              ifIndex FROM IF-MIB
              PerfCurrentCount, PerfIntervalCount
                    FROM PerfHist-TC-MIB;
          
          --  This is the MIB module for the SONET/SDH Interface objects.
          
          
          sonetMIB MODULE-IDENTITY
              LAST-UPDATED "9809010000Z"
              ORGANIZATION "IETF AToM MIB Working Group"
              CONTACT-INFO
                "Kaj Tesink
                 Bellcore
                 Tel: (732) 758-5254
                 Fax: (732) 758-2269
                 E-mail: kaj@cc.bellcore.com."
              DESCRIPTION
                   "The MIB module to describe
                   SONET/SDH interfaces objects."
              ::= { transmission 39 }
          
          
          --  This is the MIB module for the SONET/SDH objects
          
          sonetObjects      OBJECT IDENTIFIER ::= { sonetMIB 1 }
          
          sonetObjectsPath  OBJECT IDENTIFIER ::= { sonetMIB 2 }
          
          sonetObjectsVT    OBJECT IDENTIFIER ::= { sonetMIB 3 }
          
          
          -- groups in the SONET/SDH MIB module
          
          
          
          
          
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          sonetMedium        OBJECT IDENTIFIER ::= { sonetObjects 1 }
          
          sonetSection       OBJECT IDENTIFIER ::= { sonetObjects 2 }
          
          sonetLine          OBJECT IDENTIFIER ::= { sonetObjects 3 }
          
          sonetFarEndLine    OBJECT IDENTIFIER ::= { sonetObjects 4 }
          
          sonetPath          OBJECT IDENTIFIER ::= { sonetObjectsPath 1 }
          
          sonetFarEndPath    OBJECT IDENTIFIER ::= { sonetObjectsPath 2 }
          
          sonetVT            OBJECT IDENTIFIER ::= { sonetObjectsVT 1 }
          
          sonetFarEndVT      OBJECT IDENTIFIER ::= { sonetObjectsVT 2 }
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          -- the SONET/SDH Medium group
          
          -- SONET/SDH interfaces for some applications may be electrical
          -- interfaces and not optical interfaces.  This group handles
          -- the configuration information for both optical SONET/SDH
          -- interfaces
          -- and electrical SONET/SDH interfaces.
          
          sonetMediumTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF SonetMediumEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
                 "The SONET/SDH Medium table."
               ::= { sonetMedium 1 }
          
          sonetMediumEntry OBJECT-TYPE
              SYNTAX  SonetMediumEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
                 "An entry in the SONET/SDH Medium table."
              INDEX   { ifIndex }
               ::= { sonetMediumTable 1 }
          
          SonetMediumEntry ::=
              SEQUENCE {
                   sonetMediumType               INTEGER,
                   sonetMediumTimeElapsed        Integer32,
                   sonetMediumValidIntervals     Integer32,
                   sonetMediumLineCoding         INTEGER,
                   sonetMediumLineType           INTEGER,
                   sonetMediumCircuitIdentifier  DisplayString,
                   sonetMediumInvalidIntervals   Integer32,
                   sonetMediumLoopbackConfig     BITS
              }
          
          
          sonetMediumType OBJECT-TYPE
              SYNTAX  INTEGER  {
                         sonet(1),
                         sdh(2)
                      }
              MAX-ACCESS  read-write
              STATUS  current
          
          
          
          
          
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              DESCRIPTION
                 "This variable identifies whether a SONET
                 or a SDH signal is used across this interface."
              ::= { sonetMediumEntry 1 }
          
          sonetMediumTimeElapsed OBJECT-TYPE
              SYNTAX  Integer32 (1..900)
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                 "The number of seconds, that have elapsed since
                 the beginning of the current measurement period.
                 If, for some reason, such as an adjustment in the
                 system's time-of-day clock, the current interval
                 exceeds the maximum value, the agent will return
                 the maximum value."
              ::= { sonetMediumEntry 2 }
          
          sonetMediumValidIntervals OBJECT-TYPE
              SYNTAX  Integer32 (0..96)
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                 "The number of previous 15-minute intervals
                 for which valid data was collected.
                 A SONET/SDH interface must be capable
                 of supporting at least n intervals.
                 The minimum value of n is 4.
                 The default of n is 32.
                 The maximum value of n is 96.
                 The value will be <n> unless the measurement was
                 (re-)started within the last (<n>*15) minutes, in which
                 case the value will be the number of complete 15
                 minute intervals for which the agent has at least
                 some valid data. In certain cases (e.g., in the case
                 where the agent is a proxy) it is possible that some
                 intervals are unavailable.  In this case, this
                 interval is the maximum interval number for
                 which valid data is available. "
              ::= { sonetMediumEntry 3 }
          
          sonetMediumLineCoding OBJECT-TYPE
              SYNTAX  INTEGER {
                          sonetMediumOther(1),
                          sonetMediumB3ZS(2),
          
          
          
          
          
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                          sonetMediumCMI(3),
                          sonetMediumNRZ(4),
                          sonetMediumRZ(5)
                      }
              MAX-ACCESS  read-write
              STATUS  current
              DESCRIPTION
                 "This variable describes the line coding for
                 this interface. The B3ZS and CMI are used for
                 electrical SONET/SDH signals (STS-1 and STS-3).
                 The Non-Return to Zero (NRZ) and the Return
                 to Zero are used for optical SONET/SDH signals."
              ::= { sonetMediumEntry 4 }
          
          sonetMediumLineType OBJECT-TYPE
              SYNTAX  INTEGER {
                          sonetOther(1),
                          sonetShortSingleMode(2),
                          sonetLongSingleMode(3),
                          sonetMultiMode(4),
                          sonetCoax(5),
                          sonetUTP(6)
                      }
              MAX-ACCESS  read-write
              STATUS  current
              DESCRIPTION
                 "This variable describes the line type for
                 this interface. The line types are
                 Short and Long Range
                 Single Mode fiber or Multi-Mode fiber interfaces,
                 and coax and UTP for electrical interfaces.  The
                 value sonetOther should be used when the Line Type is
                 not one of the listed values."
              ::= { sonetMediumEntry 5 }
          
          sonetMediumCircuitIdentifier OBJECT-TYPE
              SYNTAX  DisplayString (SIZE (0..255))
              MAX-ACCESS  read-write
              STATUS  current
              DESCRIPTION
                 "This variable contains the transmission
                 vendor's circuit identifier, for the
                 purpose of facilitating troubleshooting.
                 Note that the circuit identifier, if available,
                 is also represented by ifPhysAddress."
          
          
          
          
          
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              ::= { sonetMediumEntry 6 }
          
          sonetMediumInvalidIntervals OBJECT-TYPE
              SYNTAX  Integer32 (0..96)
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                  "The number of intervals in the range from
                  0 to sonetMediumValidIntervals for which no
                  data is available. This object will typically
                  be zero except in cases where the data for some
                  intervals are not available (e.g., in proxy
                  situations)."
              ::= { sonetMediumEntry 7 }
          
          sonetMediumLoopbackConfig OBJECT-TYPE
              SYNTAX      BITS {
                            sonetNoLoop(0),
                            sonetFacilityLoop(1),
                            sonetTerminalLoop(2),
                            sonetOtherLoop(3) }
              MAX-ACCESS  read-write
              STATUS      current
              DESCRIPTION
                 "The current loopback state of the SONET/SDH interface.  The
                  values mean:
          
                    sonetNoLoop
                       Not in the loopback state. A device that is not
                       capable of performing a loopback on this interface
                       shall always return this value.
          
                    sonetFacilityLoop
                       The received signal at this interface is looped back
                       out through the corresponding transmitter in the return
                       direction.
          
                    sonetTerminalLoop
                       The signal that is about to be transmitted is connected
                       to the associated incoming receiver.
          
                    sonetOtherLoop
                       Loopbacks that are not defined here."
          
              ::= { sonetMediumEntry 8 }
          
          
          
          
          
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          sonetSESthresholdSet    OBJECT-TYPE
              SYNTAX   INTEGER {
                         other(1),
                         bellcore1991(2),
                         ansi1993(3),
                         itu1995(4),
                         ansi1997(5)
                                }
              MAX-ACCESS      read-write
              STATUS          current
              DESCRIPTION
                "An enumerated integer indicating which
                 recognized set of SES thresholds that
                 the agent uses for determining severely
                 errored seconds and unavailable time.
          
                 other(1)
                   None of the following.
          
                 bellcore1991(2)
                   Bellcore TR-NWT-000253, 1991 [32], or
                   ANSI T1M1.3/93-005R2, 1993 [22].
                   See also Appendix B.
          
                 ansi1993(3)
                   ANSI T1.231, 1993 [31], or
                   Bellcore GR-253-CORE, Issue 2, 1995 [34]
          
                 itu1995(4)
                   ITU Recommendation G.826, 1995 [33]
          
                 ansi1997(5)
                   ANSI T1.231, 1997 [35]
          
                 If a manager changes the value of this
                 object then the SES statistics collected
                 prior to this change must be invalidated."
               ::= { sonetMedium 2 }
          
          
          
          
          
          
          
          
          
          
          
          
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          -- the SONET/SDH Section group
          
          -- this group consists of 2 tables:
          -- - the SONET/SDH Section Current Table
          -- - the SONET/SDH Section Interval Table
          
          
          
          -- the SONET/SDH Section Current Table
          
          -- The SONET/SDH Section
          -- current table contains various statistics
          -- being collected for the current 15 minute interval.
          
          sonetSectionCurrentTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF SonetSectionCurrentEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
                 "The SONET/SDH Section Current table."
               ::= { sonetSection 1 }
          
          sonetSectionCurrentEntry OBJECT-TYPE
              SYNTAX  SonetSectionCurrentEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
                 "An entry in the SONET/SDH Section Current table."
              INDEX   { ifIndex }
               ::= { sonetSectionCurrentTable 1 }
          
          SonetSectionCurrentEntry ::=
              SEQUENCE {
                  sonetSectionCurrentStatus   Integer32,
                  sonetSectionCurrentESs      PerfCurrentCount,
                  sonetSectionCurrentSESs     PerfCurrentCount,
                  sonetSectionCurrentSEFSs    PerfCurrentCount,
                  sonetSectionCurrentCVs      PerfCurrentCount
              }
          
          
          sonetSectionCurrentStatus OBJECT-TYPE
              SYNTAX  Integer32 (1..6)
              MAX-ACCESS  read-only
              STATUS  current
          
          
          
          
          
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              DESCRIPTION
                 "This variable indicates the
                 status of the interface.
                 The sonetSectionCurrentStatus
                 is a bit map represented
                 as a sum, therefore,
                 it can represent multiple defects
                 simultaneously.
                 The sonetSectionNoDefect should be
                 set if and only if
                 no other flag is set.
          
                 The various bit positions are:
                       1   sonetSectionNoDefect
                       2   sonetSectionLOS
                       4   sonetSectionLOF"
               ::= { sonetSectionCurrentEntry 1 }
          
          sonetSectionCurrentESs OBJECT-TYPE
              SYNTAX  PerfCurrentCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                 "The counter associated with the number of Errored
                 Seconds encountered by a SONET/SDH
                 Section in the current 15 minute interval."
               ::= { sonetSectionCurrentEntry 2 }
          
          sonetSectionCurrentSESs OBJECT-TYPE
              SYNTAX  PerfCurrentCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                 "The counter associated with the number of
                 Severely Errored Seconds
                 encountered by a SONET/SDH Section in the current 15
                 minute interval."
               ::= { sonetSectionCurrentEntry 3 }
          
          sonetSectionCurrentSEFSs OBJECT-TYPE
              SYNTAX  PerfCurrentCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                 "The counter associated with the number of
          
          
          
          
          
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                 Severely Errored Framing Seconds
                 encountered by a SONET/SDH Section in the current
                 15 minute interval."
              ::= { sonetSectionCurrentEntry 4 }
          
          sonetSectionCurrentCVs OBJECT-TYPE
              SYNTAX  PerfCurrentCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                 "The counter associated with the number of Coding
                 Violations encountered by a
                 SONET/SDH Section in the current 15 minute interval."
               ::= { sonetSectionCurrentEntry 5 }
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          -- the SONET/SDH Section Interval Table
          
          -- The SONET/SDH Section Interval Table
          -- contains various statistics
          -- collected by each system over a maximum
          -- of the previous 24 hours of
          -- operation.  The past 24 hours may be broken into 96
          -- completed 15 minute intervals.
          -- A system is required to store at
          -- least 4 completed 15 minute interval.
          -- The default value is 32 intervals.
          
          sonetSectionIntervalTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF SonetSectionIntervalEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
                 "The SONET/SDH Section Interval table."
               ::= { sonetSection 2 }
          
          sonetSectionIntervalEntry OBJECT-TYPE
              SYNTAX  SonetSectionIntervalEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
                 "An entry in the SONET/SDH Section Interval table."
              INDEX   { ifIndex,
                        sonetSectionIntervalNumber }
               ::= { sonetSectionIntervalTable 1 }
          
          SonetSectionIntervalEntry ::=
              SEQUENCE {
                   sonetSectionIntervalNumber  Integer32,
                   sonetSectionIntervalESs     PerfIntervalCount,
                   sonetSectionIntervalSESs    PerfIntervalCount,
                   sonetSectionIntervalSEFSs   PerfIntervalCount,
                   sonetSectionIntervalCVs     PerfIntervalCount,
                   sonetSectionIntervalValidData  TruthValue
              }
          
          
          sonetSectionIntervalNumber OBJECT-TYPE
              SYNTAX  Integer32 (1..96)
              MAX-ACCESS  not-accessible
              STATUS  current
          
          
          
          
          
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              DESCRIPTION
                "A number between 1 and 96, which identifies the
                interval for which the set of statistics is available.
                The interval identified by 1 is the most recently
                completed 15 minute interval,
                and the interval identified
                by N is the interval immediately preceding the
                one identified
                by N-1."
               ::= { sonetSectionIntervalEntry 1 }
          
          sonetSectionIntervalESs OBJECT-TYPE
              SYNTAX  PerfIntervalCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                 "The counter associated with the number of
                 Errored Seconds encountered
                 by a SONET/SDH Section in a
                 particular 15-minute interval
                 in the past 24 hours."
               ::= { sonetSectionIntervalEntry 2 }
          
          sonetSectionIntervalSESs OBJECT-TYPE
              SYNTAX  PerfIntervalCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                 "The counter associated with the number of
                 Severely Errored Seconds
                 encountered by a SONET/SDH Section in a
                 particular 15-minute interval
                 in the past 24 hours."
              ::= { sonetSectionIntervalEntry 3 }
          
          sonetSectionIntervalSEFSs OBJECT-TYPE
              SYNTAX  PerfIntervalCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                 "The counter associated with the number of
                 Severely Errored Framing Seconds
                 encountered by a SONET/SDH Section in a
                 particular 15-minute interval
                 in the past 24 hours."
          
          
          
          
          
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              ::= { sonetSectionIntervalEntry 4 }
          
          sonetSectionIntervalCVs OBJECT-TYPE
              SYNTAX  PerfIntervalCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                 "The counter associated with the number of Coding
                 Violations encountered by a
                 SONET/SDH Section in a particular 15-minute interval
                 in the past 24 hours."
              ::= { sonetSectionIntervalEntry 5 }
          
          sonetSectionIntervalValidData OBJECT-TYPE
              SYNTAX  TruthValue
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                 "This variable indicates if the data for this
                  interval is valid."
              ::= { sonetSectionIntervalEntry 6 }
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          -- the SONET/SDH Line group
          
          -- this group consists of 2 tables:
          -- - the SONET/SDH Line Current Table
          -- - the SONET/SDH Line Interval Table
          
          
          -- the SONET/SDH Line Current Table
          
          -- The SONET/SDH Line
          -- current table contains various statistics
          -- being collected for the current 15 minute interval.
          
          sonetLineCurrentTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF SonetLineCurrentEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
                "The SONET/SDH Line Current table."
              ::= { sonetLine 1 }
          
          sonetLineCurrentEntry OBJECT-TYPE
              SYNTAX  SonetLineCurrentEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
                "An entry in the SONET/SDH Line Current table."
              INDEX   { ifIndex }
              ::= { sonetLineCurrentTable 1 }
          
          SonetLineCurrentEntry ::=
              SEQUENCE {
                   sonetLineCurrentStatus    Integer32,
                   sonetLineCurrentESs       PerfCurrentCount,
                   sonetLineCurrentSESs      PerfCurrentCount,
                   sonetLineCurrentCVs       PerfCurrentCount,
                   sonetLineCurrentUASs      PerfCurrentCount
               }
          
          
          sonetLineCurrentStatus OBJECT-TYPE
              SYNTAX  Integer32 (1..6)
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
          
          
          
          
          
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                 "This variable indicates the
                 status of the interface.
                 The sonetLineCurrentStatus
                 is a bit map represented
                 as a sum, therefore,
                 it can represent multiple defects
                 simultaneously.
                 The sonetLineNoDefect should be
                 set if and only if
                 no other flag is set.
          
                 The various bit positions are:
                  1   sonetLineNoDefect
                  2   sonetLineAIS
                  4   sonetLineRDI"
               ::= { sonetLineCurrentEntry 1 }
          
          sonetLineCurrentESs OBJECT-TYPE
              SYNTAX  PerfCurrentCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
               "The counter associated with the number of Errored
               Seconds encountered by a SONET/SDH
               Line in the current 15 minute interval."
              ::= { sonetLineCurrentEntry 2 }
          
          sonetLineCurrentSESs OBJECT-TYPE
              SYNTAX  PerfCurrentCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
               "The counter associated with the number of
               Severely Errored Seconds
               encountered by a SONET/SDH Line in the current 15
               minute
               interval."
              ::= { sonetLineCurrentEntry 3 }
          
          sonetLineCurrentCVs OBJECT-TYPE
              SYNTAX  PerfCurrentCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
               "The counter associated with the number of Coding
          
          
          
          
          
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               Violations encountered by a
               SONET/SDH Line in the current 15 minute interval."
              ::= { sonetLineCurrentEntry 4 }
          
          sonetLineCurrentUASs OBJECT-TYPE
              SYNTAX  PerfCurrentCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
               "The counter associated with the number of
               Unavailable Seconds
               encountered by a SONET/SDH Line in the current 15
               minute
               interval."
              ::= { sonetLineCurrentEntry 5 }
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          -- the SONET/SDH Line Interval Table
          
          -- The SONET/SDH Line Interval Table
          -- contains various statistics
          -- collected by each system over a maximum
          -- of the previous 24 hours of
          -- operation.  The past 24 hours may be broken into 96
          -- completed 15 minute intervals.
          -- A system is required to store at
          -- least 4 completed 15 minute interval.
          -- The default value is 32 intervals.
          
          sonetLineIntervalTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF SonetLineIntervalEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
                 "The SONET/SDH Line Interval table."
               ::= { sonetLine 2 }
          
          sonetLineIntervalEntry OBJECT-TYPE
              SYNTAX  SonetLineIntervalEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
                 "An entry in the SONET/SDH Line Interval table."
             INDEX   { ifIndex,
                       sonetLineIntervalNumber }
             ::= { sonetLineIntervalTable 1 }
          
          SonetLineIntervalEntry ::=
              SEQUENCE {
                  sonetLineIntervalNumber    Integer32,
                  sonetLineIntervalESs       PerfIntervalCount,
                  sonetLineIntervalSESs      PerfIntervalCount,
                  sonetLineIntervalCVs       PerfIntervalCount,
                  sonetLineIntervalUASs      PerfIntervalCount,
                  sonetLineIntervalValidData TruthValue
              }
          
          
          sonetLineIntervalNumber OBJECT-TYPE
              SYNTAX  Integer32 (1..96)
              MAX-ACCESS  not-accessible
              STATUS  current
          
          
          
          
          
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              DESCRIPTION
                  "A number between 1 and 96, which identifies the
                  interval for which the set of statistics is available.
                  The interval identified by 1 is the most recently
                  completed 15 minute interval,
                  and the interval identified
                  by N is the interval immediately preceding the
                  one identified
                  by N-1."
               ::= { sonetLineIntervalEntry 1 }
          
          sonetLineIntervalESs OBJECT-TYPE
              SYNTAX  PerfIntervalCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                 "The counter associated with the number of
                 Errored Seconds encountered
                 by a SONET/SDH Line in a
                 particular 15-minute interval
                 in the past 24 hours."
               ::= { sonetLineIntervalEntry 2 }
          
          sonetLineIntervalSESs OBJECT-TYPE
              SYNTAX  PerfIntervalCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                 "The counter associated with the number of
                 Severely Errored Seconds
                 encountered by a SONET/SDH Line in a
                 particular 15-minute interval
                 in the past 24 hours."
                ::= { sonetLineIntervalEntry 3 }
          
          sonetLineIntervalCVs OBJECT-TYPE
              SYNTAX  PerfIntervalCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                "The counter associated with the number of Coding
                Violations encountered by a
                SONET/SDH Line in a
                particular 15-minute interval
                in the past 24 hours."
          
          
          
          
          
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              ::= { sonetLineIntervalEntry 4 }
          
          sonetLineIntervalUASs OBJECT-TYPE
              SYNTAX  PerfIntervalCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                "The counter associated with the
                number of Unavailable Seconds
                encountered by a SONET/SDH Line in
                a particular 15-minute interval
                in the past 24 hours."
              ::= { sonetLineIntervalEntry 5 }
          
          sonetLineIntervalValidData OBJECT-TYPE
              SYNTAX  TruthValue
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                 "This variable indicates if the data for this
                  interval is valid."
              ::= { sonetLineIntervalEntry 6 }
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          -- The SONET/SDH Far End Line group.
          -- This group may only be implemented by SONET/SDH (LTEs)
          -- systems that provide for a far end block error (FEBE)
          -- information at the SONET/SDH Line Layer.
          
          -- This group consists of two tables:
          --    SONET/SDH Far End Line Current Table
          --    SONET/SDH Far End Line Interval Table
          
          
          
          -- The SONET/SDH Far End Line Current Table
          
          -- The SONET/SDH Far End Line Current table contains
          -- various statistics being
          -- collected for the current 15 minute interval.
          -- The statistics are collected from the far end
          -- block error code (FEBE)
          -- within the third Z2 byte of the Line Overhead
          -- in Broadband ISDN applications.
          -- The definitions are the same as described for
          -- the near-end information.
          
          sonetFarEndLineCurrentTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF SonetFarEndLineCurrentEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
                "The SONET/SDH Far End Line Current table."
              ::= { sonetFarEndLine 1 }
          
          sonetFarEndLineCurrentEntry OBJECT-TYPE
              SYNTAX  SonetFarEndLineCurrentEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
                "An entry in the SONET/SDH Far End Line Current table."
              INDEX   { ifIndex }
              ::= { sonetFarEndLineCurrentTable 1 }
          
          SonetFarEndLineCurrentEntry ::=
              SEQUENCE {
                  sonetFarEndLineCurrentESs       PerfCurrentCount,
                  sonetFarEndLineCurrentSESs      PerfCurrentCount,
                  sonetFarEndLineCurrentCVs       PerfCurrentCount,
          
          
          
          
          
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                  sonetFarEndLineCurrentUASs      PerfCurrentCount
                 }
          
          sonetFarEndLineCurrentESs OBJECT-TYPE
             SYNTAX  PerfCurrentCount
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                 "The counter associated with the number of Far
                 End Errored Seconds encountered by a SONET/SDH
                 interface in the current 15 minute interval."
             ::= { sonetFarEndLineCurrentEntry 1 }
          
          sonetFarEndLineCurrentSESs OBJECT-TYPE
             SYNTAX  PerfCurrentCount
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                 "The counter associated with the number of
                 Far End Severely Errored Seconds
                 encountered by a SONET/SDH Medium/Section/Line
                 interface in the current 15 minute
                 interval."
             ::= { sonetFarEndLineCurrentEntry 2 }
          
          sonetFarEndLineCurrentCVs OBJECT-TYPE
             SYNTAX  PerfCurrentCount
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                 "The counter associated with the number of
                 Far End Coding Violations reported via
                 the far end block error count
                 encountered by a
                 SONET/SDH Medium/Section/Line
                 interface in the current 15 minute interval."
             ::= { sonetFarEndLineCurrentEntry 3 }
          
          sonetFarEndLineCurrentUASs OBJECT-TYPE
             SYNTAX  PerfCurrentCount
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                 "The counter associated with the number of
                 Far End Unavailable Seconds
          
          
          
          
          
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                 encountered by a
                 SONET/SDH Medium/Section/Line
                 interface in the current 15 minute interval."
             ::= { sonetFarEndLineCurrentEntry 4 }
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          -- The SONET/SDH Far End Line Interval Table
          
          -- The SONET/SDH Far End Line Interval Table
          -- contains various statistics
          -- collected by each system over a maximum
          -- of the previous 24 hours of
          -- operation.  The past 24 hours may be broken into 96
          -- completed 15 minute intervals.
          -- A system is required to store at
          -- least 4 completed 15 minute interval.
          -- The default value is 32 intervals.
          
          sonetFarEndLineIntervalTable OBJECT-TYPE
             SYNTAX  SEQUENCE OF SonetFarEndLineIntervalEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
                "The SONET/SDH Far End Line Interval table."
             ::= { sonetFarEndLine 2 }
          
          sonetFarEndLineIntervalEntry OBJECT-TYPE
             SYNTAX  SonetFarEndLineIntervalEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
               "An entry in the SONET/SDH Far
               End Line Interval table."
             INDEX   { ifIndex,
                       sonetFarEndLineIntervalNumber }
             ::= { sonetFarEndLineIntervalTable 1 }
          
          SonetFarEndLineIntervalEntry ::=
              SEQUENCE {
                   sonetFarEndLineIntervalNumber    Integer32,
                   sonetFarEndLineIntervalESs       PerfIntervalCount,
                   sonetFarEndLineIntervalSESs      PerfIntervalCount,
                   sonetFarEndLineIntervalCVs       PerfIntervalCount,
                   sonetFarEndLineIntervalUASs      PerfIntervalCount,
                   sonetFarEndLineIntervalValidData TruthValue
              }
          
          
          sonetFarEndLineIntervalNumber OBJECT-TYPE
             SYNTAX  Integer32 (1..96)
             MAX-ACCESS  not-accessible
          
          
          
          
          
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             STATUS  current
             DESCRIPTION
                   "A number between 1 and 96, which identifies the
                   interval for which the set of statistics is available.
                   The interval identified by 1 is the most recently
                   completed 15 minute interval,
                   and the interval identified
                   by N is the interval immediately preceding the
                   one identified
                   by N-1."
             ::= { sonetFarEndLineIntervalEntry 1 }
          
          sonetFarEndLineIntervalESs OBJECT-TYPE
             SYNTAX  PerfIntervalCount
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                  "The counter associated with the number of
                  Far End Errored Seconds encountered
                  by a SONET/SDH Line
                  interface in a particular 15-minute interval
                  in the past 24 hours."
            ::= { sonetFarEndLineIntervalEntry 2 }
          
          sonetFarEndLineIntervalSESs OBJECT-TYPE
             SYNTAX  PerfIntervalCount
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                  "The counter associated with the number of
                  Far End Severely Errored Seconds
                  encountered by a SONET/SDH Line
                  interface in a particular 15-minute interval
                  in the past 24 hours."
            ::= { sonetFarEndLineIntervalEntry 3 }
          
          sonetFarEndLineIntervalCVs OBJECT-TYPE
              SYNTAX  PerfIntervalCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                   "The counter associated with the number of
                   Far End Coding Violations reported via
                   the far end block error count
                   encountered by a
          
          
          
          
          
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                   SONET/SDH Line
                   interface in a particular 15-minute interval
                   in the past 24 hours."
              ::= { sonetFarEndLineIntervalEntry 4 }
          
          sonetFarEndLineIntervalUASs OBJECT-TYPE
             SYNTAX  PerfIntervalCount
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                 "The counter associated with the number of
                 Far End Unavailable Seconds
                 encountered by a
                 SONET/SDH Line
                 interface in a particular 15-minute interval
                 in the past 24 hours."
             ::= { sonetFarEndLineIntervalEntry 5 }
          
          sonetFarEndLineIntervalValidData OBJECT-TYPE
              SYNTAX  TruthValue
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                 "This variable indicates if the data for this
                  interval is valid."
              ::= { sonetFarEndLineIntervalEntry 6 }
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          -- the SONET/SDH Path group
          
          -- this group consists of 2 tables:
          -- - the SONET/SDH Path Current Table
          -- - the SONET/SDH Path Interval Table
          
          
          -- the SONET/SDH Path Current Table
          
          -- The SONET/SDH Path
          -- current table contains various statistics
          -- being collected for the current 15 minute interval.
          
          sonetPathCurrentTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF SonetPathCurrentEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
               "The SONET/SDH Path Current table."
          ::= { sonetPath 1 }
          
          sonetPathCurrentEntry OBJECT-TYPE
              SYNTAX  SonetPathCurrentEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
               "An entry in the SONET/SDH Path Current table."
              INDEX   { ifIndex }
          ::= { sonetPathCurrentTable 1 }
          
          SonetPathCurrentEntry ::=
              SEQUENCE {
                  sonetPathCurrentWidth      INTEGER,
                  sonetPathCurrentStatus     Integer32,
                  sonetPathCurrentESs        PerfCurrentCount,
                  sonetPathCurrentSESs       PerfCurrentCount,
                  sonetPathCurrentCVs        PerfCurrentCount,
                  sonetPathCurrentUASs       PerfCurrentCount
              }
          
          
          sonetPathCurrentWidth OBJECT-TYPE
              SYNTAX  INTEGER  {
                      sts1(1),
                      sts3cSTM1(2),
          
          
          
          
          
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                      sts12cSTM4(3),
                      sts24c(4),
                      sts48cSTM16(5)
               }
              MAX-ACCESS  read-write
              STATUS  current
              DESCRIPTION
               "A value that indicates the type of the SONET/SDH
               Path.  For SONET, the assigned types are
               the STS-Nc SPEs, where N = 1, 3, 12, 24, and 48.
               STS-1 is equal to 51.84 Mbps.  For SDH, the assigned
               types are the STM-Nc VCs, where N = 1, 4, and 16."
          ::= { sonetPathCurrentEntry 1 }
          
          sonetPathCurrentStatus OBJECT-TYPE
              SYNTAX  Integer32 (1..62)
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                "This variable indicates the
                status of the interface.
                The sonetPathCurrentStatus
                is a bit map represented
                as a sum, therefore,
                it can represent multiple defects
                simultaneously.
                The sonetPathNoDefect should be
                set if and only if
                no other flag is set.
          
                The various bit positions are:
                   1   sonetPathNoDefect
                   2   sonetPathSTSLOP
                   4   sonetPathSTSAIS
                   8   sonetPathSTSRDI
                  16   sonetPathUnequipped
                  32   sonetPathSignalLabelMismatch"
          ::= { sonetPathCurrentEntry 2 }
          
          sonetPathCurrentESs OBJECT-TYPE
              SYNTAX  PerfCurrentCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
               "The counter associated with the number of Errored
          
          
          
          
          
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               Seconds encountered by a SONET/SDH
               Path in the current 15 minute interval."
          ::= { sonetPathCurrentEntry 3 }
          
          sonetPathCurrentSESs OBJECT-TYPE
              SYNTAX  PerfCurrentCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
               "The counter associated with the number of
               Severely Errored Seconds
               encountered by a SONET/SDH Path in the current 15
               minute
               interval."
          ::= { sonetPathCurrentEntry 4 }
          
          sonetPathCurrentCVs OBJECT-TYPE
              SYNTAX  PerfCurrentCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
               "The counter associated with the number of Coding
               Violations encountered by a
               SONET/SDH Path in the current 15 minute interval."
          ::= { sonetPathCurrentEntry 5 }
          
          sonetPathCurrentUASs OBJECT-TYPE
              SYNTAX  PerfCurrentCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
               "The counter associated with the number of
               Unavailable Seconds
               encountered by a Path in the current
               15 minute interval."
          ::= { sonetPathCurrentEntry 6 }
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          -- the SONET/SDH Path Interval Table
          
          -- The SONET/SDH Path Interval Table
          -- contains various statistics
          -- collected by each system over a maximum
          -- of the previous 24 hours of
          -- operation.  The past 24 hours may be broken into 96
          -- completed 15 minute intervals.
          -- A system is required to store at
          -- least 4 completed 15 minute interval.
          -- The default value is 32 intervals.
          
          sonetPathIntervalTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF SonetPathIntervalEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
               "The SONET/SDH Path Interval table."
          ::= { sonetPath 2 }
          
          sonetPathIntervalEntry OBJECT-TYPE
              SYNTAX  SonetPathIntervalEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
               "An entry in the SONET/SDH Path Interval table."
              INDEX   { ifIndex,
                        sonetPathIntervalNumber }
          ::= { sonetPathIntervalTable 1 }
          
          
          SonetPathIntervalEntry ::=
              SEQUENCE {
                   sonetPathIntervalNumber     Integer32,
                   sonetPathIntervalESs        PerfIntervalCount,
                   sonetPathIntervalSESs       PerfIntervalCount,
                   sonetPathIntervalCVs        PerfIntervalCount,
                   sonetPathIntervalUASs       PerfIntervalCount,
                   sonetPathIntervalValidData  TruthValue
              }
          
          
          sonetPathIntervalNumber OBJECT-TYPE
              SYNTAX  Integer32 (1..96)
              MAX-ACCESS  not-accessible
          
          
          
          
          
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              STATUS  current
              DESCRIPTION
                 "A number between 1 and 96, which identifies the
                 interval for which the set of statistics is available.
                 The interval identified by 1 is the most recently
                 completed 15 minute interval,
                 and the interval identified
                 by N is the interval immediately preceding the
                 one identified
                 by N-1."
          ::= { sonetPathIntervalEntry 1 }
          
          sonetPathIntervalESs OBJECT-TYPE
              SYNTAX  PerfIntervalCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
               "The counter associated with the number of
               Errored Seconds encountered
               by a SONET/SDH Path in a
               particular 15-minute interval
               in the past 24 hours."
          ::= { sonetPathIntervalEntry 2 }
          
          sonetPathIntervalSESs OBJECT-TYPE
              SYNTAX  PerfIntervalCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
               "The counter associated with the number of
               Severely Errored Seconds
               encountered by a SONET/SDH Path in
               a particular 15-minute interval
               in the past 24 hours."
          ::= { sonetPathIntervalEntry 3 }
          
          sonetPathIntervalCVs OBJECT-TYPE
              SYNTAX  PerfIntervalCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
               "The counter associated with the number of Coding
               Violations encountered by a
               SONET/SDH Path in a particular 15-minute interval
               in the past 24 hours."
          
          
          
          
          
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          ::= { sonetPathIntervalEntry 4 }
          
          sonetPathIntervalUASs OBJECT-TYPE
              SYNTAX  PerfIntervalCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
               "The counter associated with the number of
               Unavailable Seconds
               encountered by a Path in a
               particular 15-minute interval
               in the past 24 hours."
          ::= { sonetPathIntervalEntry 5 }
          
          sonetPathIntervalValidData OBJECT-TYPE
              SYNTAX  TruthValue
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                 "This variable indicates if the data for this
                  interval is valid."
              ::= { sonetPathIntervalEntry 6 }
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          -- The SONET/SDH Far End Path group
          
          -- This group consists of two tables:
          --  - SONET/SDH Far End Path Current Table
          --  - SONET/SDH Far End Path Interval Table
          
          -- The SONET/SDH Far End Path Current Table
          
          -- The SONET/SDH Far End Path Current table
          -- contains various statistics
          -- being collected for the current 15 minute interval.
          -- The statistics are collected from
          -- the far end block error code
          -- (FEBE) within the G1 byte of the Path Overhead.
          -- The definitions are the same as described for
          -- the near-end information.
          
          sonetFarEndPathCurrentTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF SonetFarEndPathCurrentEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
                   "The SONET/SDH Far End Path Current table."
              ::= { sonetFarEndPath 1 }
          
          sonetFarEndPathCurrentEntry OBJECT-TYPE
              SYNTAX  SonetFarEndPathCurrentEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
                   "An entry in the SONET/SDH Far End Path Current table."
              INDEX   { ifIndex }
              ::= { sonetFarEndPathCurrentTable 1 }
          
          SonetFarEndPathCurrentEntry ::=
              SEQUENCE {
                  sonetFarEndPathCurrentESs       PerfCurrentCount,
                  sonetFarEndPathCurrentSESs      PerfCurrentCount,
                  sonetFarEndPathCurrentCVs       PerfCurrentCount,
                  sonetFarEndPathCurrentUASs      PerfCurrentCount
              }
          
          
          sonetFarEndPathCurrentESs OBJECT-TYPE
              SYNTAX  PerfCurrentCount
          
          
          
          
          
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              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                   "The counter associated with the number of Far
                   End Errored Seconds encountered by a SONET/SDH
                   interface in the current 15 minute interval."
              ::= { sonetFarEndPathCurrentEntry 1 }
          
          sonetFarEndPathCurrentSESs OBJECT-TYPE
              SYNTAX  PerfCurrentCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                   "The counter associated with the number of
                   Far End Severely Errored Seconds
                   encountered by a SONET/SDH Path
                   interface in the current 15 minute
                   interval."
              ::= { sonetFarEndPathCurrentEntry 2 }
          
          sonetFarEndPathCurrentCVs OBJECT-TYPE
              SYNTAX  PerfCurrentCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                   "The counter associated with the number of
                   Far End Coding Violations reported via
                   the far end block error count
                   encountered by a
                   SONET/SDH Path interface in
                   the current 15 minute interval."
              ::= { sonetFarEndPathCurrentEntry 3 }
          
          sonetFarEndPathCurrentUASs OBJECT-TYPE
             SYNTAX  PerfCurrentCount
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                 "The counter associated with the number of
                 Far End Unavailable Seconds
                 encountered by a
                 SONET/SDH Path interface in
                 the current 15 minute interval."
             ::= { sonetFarEndPathCurrentEntry 4 }
          
          
          
          
          
          
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          -- The SONET/SDH Far End Path Interval Table
          
          -- The SONET/SDH Far End Path Interval Table
          -- contains various statistics
          -- collected by each system over a maximum
          -- of the previous 24 hours of
          -- operation.  The past 24 hours may be broken into 96
          -- completed 15 minute intervals.
          -- A system is required to store at
          -- least 4 completed 15 minute interval.
          -- The default value is 32 intervals.
          
          sonetFarEndPathIntervalTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF SonetFarEndPathIntervalEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
                  "The SONET/SDH Far End Path Interval table."
              ::= { sonetFarEndPath 2 }
          
          sonetFarEndPathIntervalEntry OBJECT-TYPE
              SYNTAX  SonetFarEndPathIntervalEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
                 "An entry in the SONET/SDH Far
                 End Path Interval table."
              INDEX   { ifIndex,
                        sonetFarEndPathIntervalNumber }
              ::= { sonetFarEndPathIntervalTable 1 }
          
          SonetFarEndPathIntervalEntry ::=
              SEQUENCE {
                   sonetFarEndPathIntervalNumber     Integer32,
                   sonetFarEndPathIntervalESs        PerfIntervalCount,
                   sonetFarEndPathIntervalSESs       PerfIntervalCount,
                   sonetFarEndPathIntervalCVs        PerfIntervalCount,
                   sonetFarEndPathIntervalUASs       PerfIntervalCount,
                   sonetFarEndPathIntervalValidData  TruthValue
              }
          
          sonetFarEndPathIntervalNumber OBJECT-TYPE
             SYNTAX  Integer32 (1..96)
             MAX-ACCESS  not-accessible
             STATUS  current
          
          
          
          
          
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             DESCRIPTION
                  "A number between 1 and 96, which identifies the
                  interval for which the set of statistics is available.
                  The interval identified by 1 is the most recently
                  completed 15 minute interval,
                  and the interval identified
                  by N is the interval immediately preceding the
                  one identified
                  by N-1."
             ::= { sonetFarEndPathIntervalEntry 1 }
          
          sonetFarEndPathIntervalESs OBJECT-TYPE
             SYNTAX  PerfIntervalCount
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                  "The counter associated with the number of
                  Far End Errored Seconds encountered
                  by a SONET/SDH Path interface in a
                  particular 15-minute interval
                  in the past 24 hours."
             ::= { sonetFarEndPathIntervalEntry 2 }
          
          sonetFarEndPathIntervalSESs OBJECT-TYPE
             SYNTAX  PerfIntervalCount
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                  "The counter associated with the number of
                  Far End Severely Errored Seconds
                  encountered by a SONET/SDH Path interface
                  in a particular 15-minute interval
                  in the past 24 hours."
             ::= { sonetFarEndPathIntervalEntry 3 }
          
          sonetFarEndPathIntervalCVs OBJECT-TYPE
              SYNTAX  PerfIntervalCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                   "The counter associated with the number of
                   Far End Coding Violations reported via
                   the far end block error count
                   encountered by a
                   SONET/SDH Path interface
          
          
          
          
          
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                   in a particular 15-minute interval
                   in the past 24 hours."
              ::= { sonetFarEndPathIntervalEntry 4 }
          
          sonetFarEndPathIntervalUASs OBJECT-TYPE
             SYNTAX  PerfIntervalCount
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                 "The counter associated with the number of
                 Far End Unavailable Seconds
                 encountered by a
                 SONET/SDH Path interface in
                 a particular 15-minute interval
                 in the past 24 hours."
             ::= { sonetFarEndPathIntervalEntry 5 }
          
          sonetFarEndPathIntervalValidData OBJECT-TYPE
              SYNTAX  TruthValue
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                 "This variable indicates if the data for this
                  interval is valid."
              ::= { sonetFarEndPathIntervalEntry 6 }
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          -- the SONET/SDH Virtual Tributary group
          
          -- this group consists of 2 tables:
          -- - the SONET/SDH VT Current Table
          -- - the SONET/SDH VT Interval Table
          
          -- For SDH signals, virtual tributaries are
          -- called VCs instead of VTs
          
          -- A VT1.5 = VC11
          -- A VT2 = VC12
          -- A VT3 = none
          -- A VT6 = VC3
          
          
          -- the SONET/SDH VT Current Table
          
          -- The SONET/SDH VT current table
          -- contains various statistics
          -- being collected for the
          -- current 15 minute interval.
          
          sonetVTCurrentTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF SonetVTCurrentEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
               "The SONET/SDH VT Current table."
          ::= { sonetVT 1 }
          
          sonetVTCurrentEntry OBJECT-TYPE
              SYNTAX  SonetVTCurrentEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
               "An entry in the SONET/SDH VT Current table."
              INDEX   { ifIndex }
          ::= { sonetVTCurrentTable 1 }
          
          SonetVTCurrentEntry ::=
              SEQUENCE {
                  sonetVTCurrentWidth      INTEGER,
                  sonetVTCurrentStatus     Integer32,
                  sonetVTCurrentESs        PerfCurrentCount,
                  sonetVTCurrentSESs       PerfCurrentCount,
          
          
          
          
          
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                  sonetVTCurrentCVs        PerfCurrentCount,
                  sonetVTCurrentUASs       PerfCurrentCount
              }
          
          sonetVTCurrentWidth OBJECT-TYPE
              SYNTAX  INTEGER {
                      vtWidth15VC11(1),
                      vtWidth2VC12(2),
                      vtWidth3(3),
                      vtWidth6VC2(4),
                      vtWidth6c(5)
                   }
              MAX-ACCESS  read-write
              STATUS  current
              DESCRIPTION
              "A value that indicates the type of the SONET
               VT and SDH VC.  Assigned widths are
               VT1.5/VC11, VT2/VC12, VT3, VT6/VC2, and VT6c."
          ::= { sonetVTCurrentEntry 1 }
          
          sonetVTCurrentStatus OBJECT-TYPE
              SYNTAX  Integer32 (1..126)
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                "This variable indicates the
                status of the interface.
                The sonetVTCurrentStatus
                is a bit map represented
                as a sum, therefore,
                it can represent multiple defects
                and failures
                simultaneously.
                The sonetVTNoDefect should be
                set if and only if
                no other flag is set.
          
                The various bit positions are:
                   1   sonetVTNoDefect
                   2   sonetVTLOP
                   4   sonetVTPathAIS
                   8   sonetVTPathRDI
                  16   sonetVTPathRFI
                  32   sonetVTUnequipped
                  64   sonetVTSignalLabelMismatch"
          
          
          
          
          
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          ::= { sonetVTCurrentEntry 2 }
          
          sonetVTCurrentESs OBJECT-TYPE
              SYNTAX  PerfCurrentCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
               "The counter associated with the number of Errored
               Seconds encountered by a SONET/SDH
               VT in the current 15 minute interval."
          ::= { sonetVTCurrentEntry 3 }
          
          sonetVTCurrentSESs OBJECT-TYPE
              SYNTAX  PerfCurrentCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
               "The counter associated with the number of
               Severely Errored Seconds
               encountered by a SONET/SDH VT in the current 15 minute
               interval."
          ::= { sonetVTCurrentEntry 4 }
          
          sonetVTCurrentCVs OBJECT-TYPE
              SYNTAX  PerfCurrentCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
               "The counter associated with the number of Coding
               Violations encountered by a
               SONET/SDH VT in the current 15 minute interval."
          ::= { sonetVTCurrentEntry 5 }
          
          sonetVTCurrentUASs OBJECT-TYPE
              SYNTAX  PerfCurrentCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
               "The counter associated with the number of
               Unavailable Seconds
               encountered by a VT in the current
               15 minute interval."
          ::= { sonetVTCurrentEntry 6 }
          
          
          
          
          
          
          
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          -- the SONET/SDH VT Interval Table
          
          -- The SONET/SDH VT Interval Table
          -- contains various statistics
          -- collected by each system over a maximum
          -- of the previous 24 hours of
          -- operation.  The past 24 hours may be broken into 96
          -- completed 15 minute intervals.
          -- A system is required to store at
          -- least 4 completed 15 minute interval.
          -- The default value is 32 intervals.
          
          sonetVTIntervalTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF SonetVTIntervalEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
               "The SONET/SDH VT Interval table."
          ::= { sonetVT 2 }
          
          sonetVTIntervalEntry OBJECT-TYPE
              SYNTAX  SonetVTIntervalEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
               "An entry in the SONET/SDH VT Interval table."
              INDEX   { ifIndex,
                        sonetVTIntervalNumber }
          ::= { sonetVTIntervalTable 1 }
          
          SonetVTIntervalEntry ::=
              SEQUENCE {
                  sonetVTIntervalNumber     Integer32,
                  sonetVTIntervalESs        PerfIntervalCount,
                  sonetVTIntervalSESs       PerfIntervalCount,
                  sonetVTIntervalCVs        PerfIntervalCount,
                  sonetVTIntervalUASs       PerfIntervalCount,
                  sonetVTIntervalValidData  TruthValue
              }
          
          sonetVTIntervalNumber OBJECT-TYPE
              SYNTAX  Integer32 (1..96)
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
          
          
          
          
          
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                "A number between 1 and 96, which identifies the
                interval for which the set of statistics is available.
                The interval identified by 1 is the most recently
                completed 15 minute interval,
                and the interval identified
                by N is the interval immediately preceding the
                one identified
                by N-1."
          ::= { sonetVTIntervalEntry 1 }
          
          sonetVTIntervalESs OBJECT-TYPE
              SYNTAX  PerfIntervalCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
               "The counter associated with the number of
               Errored Seconds encountered
               by a SONET/SDH VT in a particular 15-minute interval
               in the past 24 hours."
          ::= { sonetVTIntervalEntry 2 }
          
          sonetVTIntervalSESs OBJECT-TYPE
              SYNTAX  PerfIntervalCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
               "The counter associated with the number of
               Severely Errored Seconds
               encountered by a SONET/SDH VT
               in a particular 15-minute interval
               in the past 24 hours."
          ::= { sonetVTIntervalEntry 3 }
          
          sonetVTIntervalCVs OBJECT-TYPE
              SYNTAX  PerfIntervalCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
               "The counter associated with the number of Coding
               Violations encountered by a
               SONET/SDH VT in a particular 15-minute interval
               in the past 24 hours."
          ::= { sonetVTIntervalEntry 4 }
          
          sonetVTIntervalUASs OBJECT-TYPE
          
          
          
          
          
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              SYNTAX  PerfIntervalCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
               "The counter associated with the number of
               Unavailable Seconds
               encountered by a VT in a particular 15-minute interval
               in the past 24 hours."
          ::= { sonetVTIntervalEntry 5 }
          
          sonetVTIntervalValidData OBJECT-TYPE
              SYNTAX  TruthValue
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                 "This variable indicates if the data for this
                  interval is valid."
              ::= { sonetVTIntervalEntry 6 }
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          -- The SONET/SDH Far End VT group
          
          -- This group consists of two tables:
          --    SONET/SDH Far End VT Current Table
          --    SONET/SDH Far End VT Interval Table
          
          
          -- The SONET/SDH Far End VT Current
          
          -- The SONET/SDH Far End VT Current table
          -- contains various statistics
          -- being collected for the current 15 minute interval.
          -- The statistics are collected from
          -- the far end block error code
          -- (FEBE) within the G1 byte of the VT Overhead.
          -- The definitions are the same as described for
          -- the near-end information.
          
          sonetFarEndVTCurrentTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF SonetFarEndVTCurrentEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
                  "The SONET/SDH Far End VT Current table."
              ::= { sonetFarEndVT 1 }
          
          sonetFarEndVTCurrentEntry OBJECT-TYPE
              SYNTAX  SonetFarEndVTCurrentEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
                  "An entry in the SONET/SDH Far End VT Current table."
              INDEX   { ifIndex }
              ::= { sonetFarEndVTCurrentTable 1 }
          
          SonetFarEndVTCurrentEntry ::=
              SEQUENCE {
                  sonetFarEndVTCurrentESs       PerfCurrentCount,
                  sonetFarEndVTCurrentSESs      PerfCurrentCount,
                  sonetFarEndVTCurrentCVs       PerfCurrentCount,
                  sonetFarEndVTCurrentUASs      PerfCurrentCount
              }
          
          
          sonetFarEndVTCurrentESs OBJECT-TYPE
          
          
          
          
          
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              SYNTAX  PerfCurrentCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                  "The counter associated with the number of Far
                  End Errored Seconds encountered by a SONET/SDH
                  interface in the current 15 minute interval."
          ::= { sonetFarEndVTCurrentEntry 1 }
          
          sonetFarEndVTCurrentSESs OBJECT-TYPE
              SYNTAX  PerfCurrentCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                  "The counter associated with the number of
                  Far End Severely Errored Seconds
                  encountered by a SONET/SDH VT interface
                  in the current 15 minute
                  interval."
              ::= { sonetFarEndVTCurrentEntry 2 }
          
          sonetFarEndVTCurrentCVs OBJECT-TYPE
              SYNTAX  PerfCurrentCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                  "The counter associated with the number of
                  Far End Coding Violations reported via
                  the far end block error count
                  encountered by a
                  SONET/SDH VT interface
                  in the current 15 minute interval."
              ::= { sonetFarEndVTCurrentEntry 3 }
          
          sonetFarEndVTCurrentUASs OBJECT-TYPE
             SYNTAX  PerfCurrentCount
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                "The counter associated with the number of
                Far End Unavailable Seconds
                encountered by a
                SONET/SDH VT interface
                in the current 15 minute interval."
             ::= { sonetFarEndVTCurrentEntry 4 }
          
          
          
          
          
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          -- The SONET/SDH Far End VT Interval Table
          
          -- The SONET/SDH Far End VT Interval Table
          -- contains various statistics
          -- collected by each system over a maximum
          -- of the previous 24 hours of
          -- operation.  The past 24 hours may be broken into 96
          -- completed 15 minute intervals.
          -- A system is required to store at
          -- least 4 completed 15 minute interval.
          -- The default value is 32 intervals.
          
          sonetFarEndVTIntervalTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF SonetFarEndVTIntervalEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
                 "The SONET/SDH Far End VT Interval table."
              ::= { sonetFarEndVT 2 }
          
          sonetFarEndVTIntervalEntry OBJECT-TYPE
              SYNTAX  SonetFarEndVTIntervalEntry
              MAX-ACCESS  not-accessible
              STATUS  current
              DESCRIPTION
                "An entry in the SONET/SDH Far
                End VT Interval table."
              INDEX   { ifIndex,
                        sonetFarEndVTIntervalNumber }
              ::= { sonetFarEndVTIntervalTable 1 }
          
          SonetFarEndVTIntervalEntry ::=
             SEQUENCE {
                   sonetFarEndVTIntervalNumber     Integer32,
                   sonetFarEndVTIntervalESs        PerfIntervalCount,
                   sonetFarEndVTIntervalSESs       PerfIntervalCount,
                   sonetFarEndVTIntervalCVs        PerfIntervalCount,
                   sonetFarEndVTIntervalUASs       PerfIntervalCount,
                   sonetFarEndVTIntervalValidData  TruthValue
              }
          
          sonetFarEndVTIntervalNumber OBJECT-TYPE
              SYNTAX  Integer32 (1..96)
              MAX-ACCESS  not-accessible
              STATUS  current
          
          
          
          
          
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              DESCRIPTION
                 "A number between 1 and 96, which identifies the
                 interval for which the set of statistics is available.
                 The interval identified by 1 is the most recently
                 completed 15 minute interval,
                 and the interval identified
                 by N is the interval immediately preceding the
                 one identified
                 by N-1."
              ::= { sonetFarEndVTIntervalEntry 1 }
          
          sonetFarEndVTIntervalESs OBJECT-TYPE
              SYNTAX  PerfIntervalCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                    "The counter associated with the number of
                    Far End Errored Seconds encountered
                    by a SONET/SDH VT interface
                    in a particular 15-minute interval
                    in the past 24 hours."
             ::= { sonetFarEndVTIntervalEntry 2 }
          
          sonetFarEndVTIntervalSESs OBJECT-TYPE
              SYNTAX  PerfIntervalCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                    "The counter associated with the number of
                    Far End Severely Errored Seconds
                    encountered by a SONET/SDH VT interface
                    in a particular 15-minute interval
                    in the past 24 hours."
              ::= { sonetFarEndVTIntervalEntry 3 }
          
          sonetFarEndVTIntervalCVs OBJECT-TYPE
              SYNTAX  PerfIntervalCount
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                   "The counter associated with the number of
                   Far End Coding Violations reported via
                   the far end block error count
                   encountered by a
                   SONET/SDH VT interface in a
          
          
          
          
          
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                   particular 15-minute interval
                   in the past 24 hours."
              ::= { sonetFarEndVTIntervalEntry 4 }
          
          sonetFarEndVTIntervalUASs OBJECT-TYPE
             SYNTAX  PerfIntervalCount
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                 "The counter associated with the number of
                 Far End Unavailable Seconds
                 encountered by a
                 SONET/SDH VT interface in a
                 particular 15-minute interval
                 in the past 24 hours."
             ::= { sonetFarEndVTIntervalEntry 5 }
          
          sonetFarEndVTIntervalValidData OBJECT-TYPE
              SYNTAX  TruthValue
              MAX-ACCESS  read-only
              STATUS  current
              DESCRIPTION
                 "This variable indicates if the data for this
                  interval is valid."
              ::= { sonetFarEndVTIntervalEntry 6 }
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          -- conformance information
          
          sonetConformance OBJECT IDENTIFIER ::= { sonetMIB 4 }
          
          sonetGroups      OBJECT IDENTIFIER ::= { sonetConformance 1 }
          sonetCompliances OBJECT IDENTIFIER ::= { sonetConformance 2 }
          
          -- deprecated compliance statement
          
          sonetCompliance MODULE-COMPLIANCE
              STATUS  deprecated
              DESCRIPTION
                      "The compliance statement for SONET/SDH interfaces."
          
              MODULE  -- this module
                  MANDATORY-GROUPS { sonetMediumStuff, sonetSectionStuff }
          
                  GROUP       sonetLineStuff
                  DESCRIPTION
                      "Implementation of this group is mandatory for all
                       SONET/SDH systems that terminate SONET/SDH Lines,
                       Paths or Virtual Tributaries."
          
                  GROUP       sonetFarEndLineStuff
                  DESCRIPTION
                      "Implementation of this group is optional for all
                       SONET/SDH systems that terminate SONET/SDH Lines,
                       Paths or Virtual Tributaries, and that
                       provide for a far end block error (FEBE)
                       information at the SONET/SDH Line Layer."
          
                  GROUP       sonetPathStuff
                  DESCRIPTION
                      "Implementation of this group is mandatory for all
                       SONET/SDH systems that terminate SONET/SDH
                       Paths or Virtual
                       Tributaries."
          
                  OBJECT      sonetPathCurrentWidth
                  MIN-ACCESS  read-only
                  DESCRIPTION
                      "Write access is not required."
          
                  GROUP       sonetFarEndPathStuff
                  DESCRIPTION
          
          
          
          
          
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                      "Implementation of this group is optional for all
                       SONET/SDH systems that terminate SONET/SDH
                       Paths or Virtual
                       Tributaries, and that process
                       Far End information."
          
                  GROUP       sonetVTStuff
                  DESCRIPTION
                      "Implementation of this group is mandatory for all
                       SONET/SDH systems that terminate SONET/SDH Virtual
                       Tributaries."
          
                  OBJECT      sonetVTCurrentWidth
                  MIN-ACCESS  read-only
                  DESCRIPTION
                      "Write access is not required."
          
                  GROUP       sonetFarEndVTStuff
                  DESCRIPTION
                      "Implementation of this group is optional for all
                       SONET/SDH systems that terminate the SONET/SDH
                       floating Virtual
                       Tributaries, and that process Far End information."
          
              ::= { sonetCompliances 1 }
          
          
          -- current compliance statements
          
          sonetCompliance2 MODULE-COMPLIANCE
              STATUS  current
              DESCRIPTION
                      "The compliance statement for SONET/SDH interfaces."
          
              MODULE  -- this module
                  MANDATORY-GROUPS { sonetMediumStuff2, sonetSectionStuff2 }
          
                  OBJECT      sonetMediumType
                  MIN-ACCESS  read-only
                  DESCRIPTION
                      "Write access is not required."
          
                  OBJECT      sonetMediumLineCoding
                  MIN-ACCESS  read-only
                  DESCRIPTION
          
          
          
          
          
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                      "Write access is not required."
          
                  OBJECT      sonetMediumLineType
                  MIN-ACCESS  read-only
                  DESCRIPTION
                      "Write access is not required."
          
                  OBJECT      sonetMediumCircuitIdentifier
                  MIN-ACCESS  read-only
                  DESCRIPTION
                      "Write access is not required."
          
                  OBJECT      sonetMediumLoopbackConfig
                  MIN-ACCESS  read-only
                  DESCRIPTION
                      "Write access is not required."
          
                  OBJECT      sonetSESthresholdSet
                  MIN-ACCESS  read-only
                  DESCRIPTION
                    "Write access is not required, and only one
                    of the enumerated values need be supported."
          
                  GROUP       sonetLineStuff2
                  DESCRIPTION
                      "Implementation of this group is mandatory for all
                       SONET/SDH systems that terminate SONET/SDH Lines,
                       Paths or Virtual Tributaries."
          
                  GROUP       sonetFarEndLineStuff2
                  DESCRIPTION
                      "Implementation of this group is optional for all
                       SONET/SDH systems that terminate SONET/SDH Lines,
                       Paths or Virtual Tributaries, and that
                       provide for a far end block error (FEBE)
                       information at the SONET/SDH Line Layer."
          
                  GROUP       sonetPathStuff2
                  DESCRIPTION
                      "Implementation of this group is mandatory for all
                       SONET/SDH systems that terminate SONET/SDH
                       Paths or Virtual
                       Tributaries."
          
                  OBJECT      sonetPathCurrentWidth
          
          
          
          
          
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                  MIN-ACCESS  read-only
                  DESCRIPTION
                      "Write access is not required."
          
                  GROUP       sonetFarEndPathStuff2
                  DESCRIPTION
                      "Implementation of this group is optional for all
                       SONET/SDH systems that terminate SONET/SDH
                       Paths or Virtual
                       Tributaries, and that process
                       Far End information."
          
                  GROUP       sonetVTStuff2
                  DESCRIPTION
                      "Implementation of this group is mandatory for all
                       SONET/SDH systems that terminate SONET/SDH Virtual
                       Tributaries."
          
                  OBJECT      sonetVTCurrentWidth
                  MIN-ACCESS  read-only
                  DESCRIPTION
                      "Write access is not required."
          
                  GROUP       sonetFarEndVTStuff2
                  DESCRIPTION
                      "Implementation of this group is optional for all
                       SONET/SDH systems that terminate the SONET/SDH
                       floating Virtual
                       Tributaries, and that process Far End information."
          
              ::= { sonetCompliances 2 }
          
          -- units of conformance
          
          -- deprecated groups
          
          sonetMediumStuff    OBJECT-GROUP
              OBJECTS { sonetMediumType,
                        sonetMediumTimeElapsed,
                        sonetMediumValidIntervals,
                        sonetMediumLineCoding,
                        sonetMediumLineType,
                        sonetMediumCircuitIdentifier }
              STATUS  deprecated
              DESCRIPTION
          
          
          
          
          
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                      "A collection of objects providing configuration
                      information applicable to all SONET/SDH interfaces."
              ::= { sonetGroups 1 }
          
          sonetSectionStuff    OBJECT-GROUP
              OBJECTS { sonetSectionCurrentStatus,
                        sonetSectionCurrentESs,
                        sonetSectionCurrentSESs,
                        sonetSectionCurrentSEFSs,
                        sonetSectionCurrentCVs,
                        sonetSectionIntervalESs,
                        sonetSectionIntervalSESs,
                        sonetSectionIntervalSEFSs,
                        sonetSectionIntervalCVs
           }
              STATUS  deprecated
              DESCRIPTION
                      "A collection of objects providing information
                      specific to SONET/SDH Section interfaces."
              ::= { sonetGroups 2 }
          
          sonetLineStuff    OBJECT-GROUP
              OBJECTS { sonetLineCurrentStatus,
                        sonetLineCurrentESs,
                        sonetLineCurrentSESs,
                        sonetLineCurrentCVs,
                        sonetLineCurrentUASs,
                        sonetLineIntervalESs,
                        sonetLineIntervalSESs,
                        sonetLineIntervalCVs,
                        sonetLineIntervalUASs }
              STATUS  deprecated
              DESCRIPTION
                      "A collection of objects providing information
                      specific to SONET/SDH Line interfaces."
              ::= { sonetGroups 3 }
          
          sonetFarEndLineStuff    OBJECT-GROUP
              OBJECTS { sonetFarEndLineCurrentESs,
                        sonetFarEndLineCurrentSESs,
                        sonetFarEndLineCurrentCVs,
                        sonetFarEndLineCurrentUASs,
                        sonetFarEndLineIntervalESs,
                        sonetFarEndLineIntervalSESs,
                        sonetFarEndLineIntervalCVs,
          
          
          
          
          
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                        sonetFarEndLineIntervalUASs }
              STATUS  deprecated
              DESCRIPTION
                      "A collection of objects providing information
                      specific to SONET/SDH Line interfaces,
                      and maintaining Line Far End information."
              ::= { sonetGroups 4 }
          
          sonetPathStuff    OBJECT-GROUP
              OBJECTS { sonetPathCurrentWidth,
                        sonetPathCurrentStatus,
                        sonetPathCurrentESs,
                        sonetPathCurrentSESs,
                        sonetPathCurrentCVs,
                        sonetPathCurrentUASs,
                        sonetPathIntervalESs,
                        sonetPathIntervalSESs,
                        sonetPathIntervalCVs,
                        sonetPathIntervalUASs }
              STATUS  deprecated
              DESCRIPTION
                      "A collection of objects providing information
                      specific to SONET/SDH Path interfaces."
              ::= { sonetGroups 5 }
          
          sonetFarEndPathStuff    OBJECT-GROUP
              OBJECTS { sonetFarEndPathCurrentESs,
                        sonetFarEndPathCurrentSESs,
                        sonetFarEndPathCurrentCVs,
                        sonetFarEndPathCurrentUASs,
                        sonetFarEndPathIntervalESs,
                        sonetFarEndPathIntervalSESs,
                        sonetFarEndPathIntervalCVs,
                        sonetFarEndPathIntervalUASs }
              STATUS  deprecated
              DESCRIPTION
                      "A collection of objects providing information
                      specific to SONET/SDH Path interfaces,
                      and maintaining Path Far End information."
              ::= { sonetGroups 6 }
          
          sonetVTStuff    OBJECT-GROUP
              OBJECTS { sonetVTCurrentWidth,
                        sonetVTCurrentStatus,
                        sonetVTCurrentESs,
          
          
          
          
          
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                        sonetVTCurrentSESs,
                        sonetVTCurrentCVs,
                        sonetVTCurrentUASs,
                        sonetVTIntervalESs,
                        sonetVTIntervalSESs,
                        sonetVTIntervalCVs,
                        sonetVTIntervalUASs }
              STATUS  deprecated
              DESCRIPTION
                      "A collection of objects providing information
                      specific to SONET/SDH VT interfaces."
              ::= { sonetGroups 7 }
          
          sonetFarEndVTStuff    OBJECT-GROUP
              OBJECTS { sonetFarEndVTCurrentESs,
                        sonetFarEndVTCurrentSESs,
                        sonetFarEndVTCurrentCVs,
                        sonetFarEndVTCurrentUASs,
                        sonetFarEndVTIntervalESs,
                        sonetFarEndVTIntervalSESs,
                        sonetFarEndVTIntervalCVs,
                        sonetFarEndVTIntervalUASs }
              STATUS  deprecated
              DESCRIPTION
                      "A collection of objects providing information
                      specific to SONET/SDH VT interfaces,
                      and maintaining VT Far End information."
              ::= { sonetGroups 8 }
          
          
          -- current groups
          
          sonetMediumStuff2    OBJECT-GROUP
              OBJECTS { sonetMediumType,
                        sonetMediumTimeElapsed,
                        sonetMediumValidIntervals,
                        sonetMediumLineCoding,
                        sonetMediumLineType,
                        sonetMediumCircuitIdentifier,
                        sonetMediumInvalidIntervals,
                        sonetMediumLoopbackConfig,
                        sonetSESthresholdSet }
              STATUS  current
              DESCRIPTION
                      "A collection of objects providing configuration
          
          
          
          
          
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                      information applicable to all SONET/SDH interfaces."
              ::= { sonetGroups 9 }
          
          sonetSectionStuff2    OBJECT-GROUP
              OBJECTS { sonetSectionCurrentStatus,
                        sonetSectionCurrentESs,
                        sonetSectionCurrentSESs,
                        sonetSectionCurrentSEFSs,
                        sonetSectionCurrentCVs,
                        sonetSectionIntervalESs,
                        sonetSectionIntervalSESs,
                        sonetSectionIntervalSEFSs,
                        sonetSectionIntervalCVs,
                        sonetSectionIntervalValidData }
              STATUS  current
              DESCRIPTION
                      "A collection of objects providing information
                      specific to SONET/SDH Section interfaces."
              ::= { sonetGroups 10 }
          
          sonetLineStuff2    OBJECT-GROUP
              OBJECTS { sonetLineCurrentStatus,
                        sonetLineCurrentESs,
                        sonetLineCurrentSESs,
                        sonetLineCurrentCVs,
                        sonetLineCurrentUASs,
                        sonetLineIntervalESs,
                        sonetLineIntervalSESs,
                        sonetLineIntervalCVs,
                        sonetLineIntervalUASs,
                        sonetLineIntervalValidData }
              STATUS  current
              DESCRIPTION
                      "A collection of objects providing information
                      specific to SONET/SDH Line interfaces."
              ::= { sonetGroups 11 }
          
          sonetPathStuff2    OBJECT-GROUP
              OBJECTS { sonetPathCurrentWidth,
                        sonetPathCurrentStatus,
                        sonetPathCurrentESs,
                        sonetPathCurrentSESs,
                        sonetPathCurrentCVs,
                        sonetPathCurrentUASs,
                        sonetPathIntervalESs,
          
          
          
          
          
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                        sonetPathIntervalSESs,
                        sonetPathIntervalCVs,
                        sonetPathIntervalUASs,
                        sonetPathIntervalValidData }
              STATUS  current
              DESCRIPTION
                      "A collection of objects providing information
                      specific to SONET/SDH Path interfaces."
              ::= { sonetGroups 12 }
          
          sonetVTStuff2    OBJECT-GROUP
              OBJECTS { sonetVTCurrentWidth,
                        sonetVTCurrentStatus,
                        sonetVTCurrentESs,
                        sonetVTCurrentSESs,
                        sonetVTCurrentCVs,
                        sonetVTCurrentUASs,
                        sonetVTIntervalESs,
                        sonetVTIntervalSESs,
                        sonetVTIntervalCVs,
                        sonetVTIntervalUASs,
                        sonetVTIntervalValidData }
              STATUS  current
              DESCRIPTION
                      "A collection of objects providing information
                      specific to SONET/SDH VT interfaces."
              ::= { sonetGroups 13 }
          
          sonetFarEndLineStuff2    OBJECT-GROUP
              OBJECTS { sonetFarEndLineCurrentESs,
                        sonetFarEndLineCurrentSESs,
                        sonetFarEndLineCurrentCVs,
                        sonetFarEndLineCurrentUASs,
                        sonetFarEndLineIntervalESs,
                        sonetFarEndLineIntervalSESs,
                        sonetFarEndLineIntervalCVs,
                        sonetFarEndLineIntervalUASs,
                        sonetFarEndLineIntervalValidData }
              STATUS  current
              DESCRIPTION
                      "A collection of objects providing information
                      specific to SONET/SDH Line interfaces,
                      and maintaining Line Far End information."
              ::= { sonetGroups 14 }
          
          
          
          
          
          
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          sonetFarEndPathStuff2    OBJECT-GROUP
              OBJECTS { sonetFarEndPathCurrentESs,
                        sonetFarEndPathCurrentSESs,
                        sonetFarEndPathCurrentCVs,
                        sonetFarEndPathCurrentUASs,
                        sonetFarEndPathIntervalESs,
                        sonetFarEndPathIntervalSESs,
                        sonetFarEndPathIntervalCVs,
                        sonetFarEndPathIntervalUASs,
                        sonetFarEndPathIntervalValidData }
              STATUS  current
              DESCRIPTION
                      "A collection of objects providing information
                      specific to SONET/SDH Path interfaces,
                      and maintaining Path Far End information."
              ::= { sonetGroups 15 }
          
          sonetFarEndVTStuff2    OBJECT-GROUP
              OBJECTS { sonetFarEndVTCurrentESs,
                        sonetFarEndVTCurrentSESs,
                        sonetFarEndVTCurrentCVs,
                        sonetFarEndVTCurrentUASs,
                        sonetFarEndVTIntervalESs,
                        sonetFarEndVTIntervalSESs,
                        sonetFarEndVTIntervalCVs,
                        sonetFarEndVTIntervalUASs,
                        sonetFarEndVTIntervalValidData }
              STATUS  current
              DESCRIPTION
                      "A collection of objects providing information
                      specific to SONET/SDH VT interfaces,
                      and maintaining VT Far End information."
              ::= { sonetGroups 16 }
          
          
          END
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          6.  Acknowledgments
          
          This specification is a product of the AToM MIB Working Group.
          The author would like to acknowledge Mike Heard for his
          valuable contributions to this memo.
          
          
          7.  Security Considerations
          
          This MIB contains both readable objects whose values provide
          the number and status of a device's network interfaces, and
          write-able objects which allow an administrator to control the
          interfaces and to perform tests on the interfaces.
          Unauthorized access to the readable objects is relatively
          innocuous.  Unauthorized access to the write- able objects
          could cause a denial of service, or in combination with other
          (e.g., physical) security breaches, could cause unauthorized
          connectivity to a device.
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          8.  References
          
          [1]  Harrington, D., Presuhn, R., and B. Wijnen, "An
               Architecture for Describing SNMP Management Frameworks",
               RFC 2271, Cabletron Systems, Inc., BMC Software, Inc.,
               IBM T. J. Watson Research, January 1998
          
          [2]  Rose, M., and K. McCloghrie, "Structure and
               Identification of Management Information for TCP/IP-based
               Internets", RFC 1155, Performance Systems International,
               Hughes LAN Systems, May 1990
          
          [3]  Rose, M., and K. McCloghrie, "Concise MIB Definitions",
               RFC 1212, Performance Systems International, Hughes LAN
               Systems, March 1991
          
          [4]  M. Rose, "A Convention for Defining Traps for use with
               the SNMP", RFC 1215, Performance Systems International,
               March 1991
          
          [5]  SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M.,
               and S.  Waldbusser, "Structure of Management Information
               for Version 2 of the Simple Network Management Protocol
               (SNMPv2)", RFC 1902, SNMP Research,Inc., Cisco Systems,
               Inc., Dover Beach Consulting, Inc., International Network
               Services, January 1996.
          
          [6]  SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M.,
               and S.  Waldbusser, "Textual Conventions for Version 2 of
               the Simple Network Management Protocol (SNMPv2)", RFC
               1903, SNMP Research, Inc., Cisco Systems, Inc., Dover
               Beach Consulting, Inc., International Network Services,
               January 1996.
          
          [7]  SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M.,
               and S.  Waldbusser, "Conformance Statements for Version 2
               of the Simple Network Management Protocol (SNMPv2)", RFC
               1904, SNMP Research, Inc., Cisco Systems, Inc., Dover
               Beach Consulting, Inc., International Network Services,
               January 1996.
          
          [8]  Case, J., Fedor, M., Schoffstall, M., and J. Davin,
               "Simple Network Management Protocol", RFC 1157, SNMP
               Research, Performance Systems International, Performance
               Systems International, MIT Laboratory for Computer
          
          
          
          
          
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               Science, May 1990.
          
          [9]  SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M.,
               and S.  Waldbusser, "Introduction to Community-based
               SNMPv2", RFC 1901, SNMP Research, Inc., Cisco Systems,
               Inc., Dover Beach Consulting, Inc., International Network
               Services, January 1996.
          
          [10] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M.,
               and S.  Waldbusser, "Transport Mappings for Version 2 of
               the Simple Network Management Protocol (SNMPv2)", RFC
               1906, SNMP Research, Inc., Cisco Systems, Inc., Dover
               Beach Consulting, Inc., International Network Services,
               January 1996.
          
          [11] Case, J., Harrington D., Presuhn R., and B. Wijnen,
               "Message Processing and Dispatching for the Simple
               Network Management Protocol (SNMP)", RFC 2272, SNMP
               Research, Inc., Cabletron Systems, Inc., BMC Software,
               Inc., IBM T. J. Watson Research, January 1998.
          
          [12] Blumenthal, U., and B. Wijnen, "User-based Security Model
               (USM) for version 3 of the Simple Network Management
               Protocol (SNMPv3)", RFC 2274, IBM T. J. Watson Research,
               January 1998.
          
          [13] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M.,
               and S.  Waldbusser, "Protocol Operations for Version 2 of
               the Simple Network Management Protocol (SNMPv2)", RFC
               1905, SNMP Research, Inc., Cisco Systems, Inc., Dover
               Beach Consulting, Inc., International Network Services,
               January 1996.
          
          [14] Levi, D., Meyer, P., and B. Stewart, SNMPv3
               Applications", RFC 2273, SNMP Research, Inc., Secure
               Computing Corporation, Cisco Systems, January 1998.
          
          [15] Wijnen, B., Presuhn, R., and K. McCloghrie, "View-based
               Access Control Model (VACM) for the Simple Network
               Management Protocol (SNMP)", RFC 2275, IBM T. J. Watson
               Research, BMC Software, Inc., Cisco Systems, Inc.,
               January 1998.
          
          [16] McCloghrie, K., and M. Rose, "Management Information Base
               for Network Management of TCP/IP-based internets - MIB-
          
          
          
          
          
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               II", RFC 1213, Hughes LAN Systems, Performance Systems
               International, March 1991.
          
          [17] Information processing systems - Open Systems
               Interconnection - Specification of Abstract Syntax
               Notation One (ASN.1), International Organization for
               Standardization.  International Standard 8824, (December,
               1987).
          
          [18] Information processing systems - Open Systems
               Interconnection - Specification of Basic Encoding Rules
               for Abstract Notation One (ASN.1), International
               Organization for Standardization.  International Standard
               8825, (December, 1987).
          
          [19] American National Standard for Telecommunications -
               Digital Hierarchy - Optical Interface Rates and Formats
               Specification, ANSI T1.105-1988.
          
          [20] American National Standard for Telecommunications -
               Digital Hierarchy - Optical Interface Rates and Formats
               Specification, ANSI T1.105-1991.
          
          [21] American National Standard for Telecommunications -
               Digital Hierarchy - Optical Interface Specification
               (Single-Mode), ANSI T1.106-1988.
          
          [22] Draft American National Standard for Telecommunications -
               Digital Hierarchy - Layer 1 In-Service Digital
               Transmission Performance Monitoring, T1M1.3/93-005R2,
               July 1993.
          
          [23] McCloghrie, K. and F. Kastenholz, "The Interfaces Group
               MIB", RFC2233, Cisco Systems, FTP Software, November
               1997.
          
          [24] Fowler, D., "Definitions of Managed Objects for the
               DS3/E3 Interface Type", RFC xxxx, Newbridge Networks,
               ???? 1996.
          
          [25] Fowler, D., "Definitions of Managed Objects for the DS1,
               E1, DS2 and E2 Interface Types", RFC xxxx, Newbridge
               Networks, ????? 1996.
          
          
          
          
          
          
          
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          [26] CCITT Recommendation G.707, "Synchronous Digital
               Hierarchy Bit Rates", June 1992.
          
          [27] CCITT Recommendation G.708, "Network Node Interface for
               the Synchronous Digital Hierarchy", June 1992.
          
          [28] CCITT Recommendation G.709, "Synchronous Multiplexing
               Structure", June 1992.
          
          [29] CCITT Recommendation G.783, "Characteristics of
               Synchronous Digital Hierarchy (SDH) Multiplexing
               Equipment Functional Blocks", November 1992.
          
          [30] Brown, T., and K. Tesink, "Definitions of Managed Objects
               for the SONET/SDH Interface Type", RFC1595, Bellcore,
               March 1994.
          
          [31] American National Standard for Telecommunications -
               Digital Hierarchy - Layer 1 In-Service Digital
               Transmission Performance Monitoring, ANSI T1.231-1993,
               September 1993.
          
          [32] Bellcore TR-NWT-000253, Issue 1, "Synchronous Optical
               Network (SONET) Transport Systems:  Common Generic
               Criteria", December 1991.
          
          [33] ITU Recommendation G.826, "Error Performance Parameters
               and Objectives for International Constant Bit Rate
               Digital Paths at or above Primary Rate", September 1995
               (COM 13-R57E).
          
          [34] Bellcore GR-253-CORE, Issue 2, "Synchronous Optical
               Network (SONET) Transport Systems Common Generic
               Criteria", December 1995.
          
          [35] American National Standard for Telecommunications -
               Digital Hierarchy - Layer 1 In-Service Digital
               Transmission Performance Monitoring, ANSI T1.231-1997,
               September 1997.
          
          [36] Tesink, Kaj, " Textual Conventions for MIB Modules Using
               Performance History Based on 15 Minute Intervals ",
               RFCxxxx, Bellcore, ????? 1998.
          
          
          
          
          
          
          
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          9.  Author's Address
          
          
          Kaj Tesink
             Bellcore
             331 Newman Springs Road
             P.O. Box 7020
             Red Bank, NJ  07701-7020
          
             Phone: (732) 758-5254
          
             EMail: kaj@cc.bellcore.com
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          10.  Full Copyright Statement
          
          Copyright (C) The Internet Society (1998).  All Rights
          Reserved.
          
          This document and translations of it may be copied and
          furnished to others, and derivative works that comment on or
          otherwise explain it or assist in its implementation may be
          prepared, copied, published and distributed, in whole or in
          part, without restriction of any kind, provided that the above
          copyright notice and this paragraph are included on all such
          copies and derivative works.  However, this document itself
          may not be modified in any way, such as by removing the
          copyright notice or references to the Internet Society or
          other Internet organizations, except as needed for the purpose
          of developing Internet standards in which case the procedures
          for copyrights defined in the Internet Standards process must
          be followed, or as required to translate it into languages
          other than English.
          
          The limited permissions granted above are perpetual and will
          not be revoked by the Internet Society or its successors or
          assigns.
          
          This document and the information contained herein is provided
          on an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET
          ENGINEERING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR
          IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE
          USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR
          ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
          PARTICULAR PURPOSE.
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          Appendix A:  The delay-line approach to statistics collection.
          
          According to ANSI T1.231 unavailable time begins at the onset
          of 10 contiguous severely errored seconds -- that is,
          unavailable time starts with the first of the 10 contiguous
          SESs -- and while an interface is deemed unavailable all
          counters for that interface are frozen except for the UAS
          count.  Since changes in the signal state lag the data to
          which they apply by 10 seconds, an implementation which wishes
          to avoid making retroactive adjustments to the counts must
          pass the the one-second statistics through a 10-second delay
          line prior to updating any counters.  That can be done by
          performing the following steps at the end of each one second
          interval.
          
          i)   Read near/far end line and path CV counts and alarm
               status flags from the hardware.
          
          ii)  Accumulate the CV counts for the preceding second and
               compare them to the ES and SES threshold for the layer in
               question.  Update the signal state and shift the one-
               second CV counts and ES/SES flags into the 10-element
               delay line.  Note that far-end one-second statistics are
               to be flagged as "absent" during any second in which
               there is an incoming defect at the layer in question or
               at any lower layer.
          
          iii) Update the current interval statistics using the signal
               state from the previous update cycle and the one-second
               CV counts and ES/SES flags shifted out of the 10-element
               delay line.
          
          This procedure guarantees that the statistical counters will
          be correctly updated at all times, although they lag real time
          by 10 seconds.  It is illustrated in the figure below.  At the
          end of each 15 minutes interval the current interval counts
          are transferred to the  most recent interval entry and each
          interval is shifted up by one position, with the oldest being
          discarded if necessary in order to make room.  The current
          interval counts then start over from zero.  Note, however,
          that the signal state calculation does not start anew at each
          interval boundary;  rather, signal state information is
          retained across interval boundaries.
          
          
          
          
          
          
          
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          +--------------------------------------------------------------+
          |          READ COUNTERS & STATUS INFO FROM HARDWARE           |
          |                                                              |
          |LOS OOF/ SECT  LINE LINE LINE LINE  PATH PATH PATH PATH PATH  |
          |    LOF   CV    AIS  CV   RDI FEBE   AIS  LOP  CV   RDI  CV   |
          +--------------------------------------------------------------+
            |   |     |     |    |    |   |      |    |    |    |    |
            |   |     |     |    |    |   |      |    |    |    |    |
            V   V     V     V    V    V   V      V    V    V    V    V
          +--------------------------------------------------------------+
          | ACCUM ONE-SEC STATS, CHK ERR THRESHOLDS, & UPDT SIGNAL STATE |
          |                                                              |
          |                                                              |
          |                  NEAR END/FAR END       NEAR END/FAR END     |
          |SECT SECT SECT  LINE LINE LINE  LINE   PATH PATH PATH  PATH   |
          |CV   ES   SES    CV   ES   SES AVA/UNA  CV   ES   SES AVA/UNA |
          +--------------------------------------------------------------+
            |    |    |      |    |    |     |      |    |    |     |
            |    |    |      |    |    |     |      |    |    |     |
            V    V    V      V    V    V     |      V    V    V     |
          +-------------+  +-------------+   |    +-------------+   |
          |ONE-SEC DELAY|  |ONE-SEC DELAY|   |    |ONE-SEC DELAY|   |
          | (1 OF 10)   |  | (1 OF 10)   |   |    | (1 OF 10)   |   |
          |CV   ES   SES|  |CV   ES   SES|   |    |CV   ES   SES|   |
          +-------------+  +-------------+   |    +-------------+   |
            |    |    |      |    |    |     |      |    |    |     |
            /    /    /      /    /    /     /      /    /    /     /
            /    /    /      /    /    /     /      /    /    /     /
            |    |    |      |    |    |     |      |    |    |     |
            V    V    V      V    V    V     |      V    V    V     |
          +-------------+  +-------------+   |    +-------------+   |
          |ONE-SEC DELAY|  |ONE-SEC DELAY|   |    |ONE-SEC DELAY|   |
          | (10 OF 10)  |  | (10 OF 10)  |   |    | (10 OF 10)  |   |
          |CV   ES   SES|  |CV   ES   SES|   |    |CV   ES   SES|   |
          +-------------+  +-------------+   |    +-------------+   |
            |    |    |      |    |    |     |      |    |    |     |
            |    |    |      |    |    |     |      |    |    |     |
            V    V    V      V    V    V     V      V    V    V     V
          +--------------------------------------------------------------+
          |              UPDATE STATISTICS COUNTERS                      |
          |                                                              |
          |                   NEAR END/FAR END       NEAR END/FAR END    |
          |   SECTION               LINE                   PATH          |
          | CV ES EFS SES   CV ES EFS SES AS UAS   CV ES EFS SES AS UAS  |
          +--------------------------------------------------------------+
          
          
          
          
          
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          Note that if such a procedure is adopted there is no current
          interval data for the first ten seconds after a system comes
          up.  noSuchInstance must be returned if a management station
          attempts to access the current interval counters during this
          time.
          
          It is an implementation-specific matter whether an agent
          assumes that the initial state of the interface is available
          or unavailable.
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
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          Appendix B - RFC1595 SES interpretation
          
          This appendix contains the values for x for the Section, Line,
          Path, and VT Layers as used in [22][30][32].
          
                         Value for x for SONET/SDH Section SES Definition
          
                    Rate            x               Minimum Bit Error Rate
                    =======================================================
                    OC-1             9                      1.5 x 10^-7
                    OC-3            16                        1 x 10^-7
                    OC-9            47                        1 x 10^-7
                    OC-12           63                        1 x 10^-7
                    OC-18           94                        1 x 10^-7
                    OC-24          125                        1 x 10^-7
                    OC-36          187                        1 x 10^-7
                    OC-48          249                        1 x 10^-7
          
          
                         Value for x for SONET/SDH Line SES Definition
          
                    Rate            x               Minimum Bit Error Rate
                    =======================================================
                    OC-1            12                       2 x 10^-7
                    OC-3            32                       2 x 10^-7
                    OC-9            47                       2 x 10^-7
                    OC-12          124                       2 x 10^-7
                    OC-18          186                       2 x 10^-7
                    OC-24          248                       2 x 10^-7
                    OC-36          370                       2 x 10^-7
                    OC-48          494                       2 x 10^-7
          
          
                         Value for x for SONET/SDH STS-Path SES Definition
          
                    Rate            x               Minimum Bit Error Rate
                    =======================================================
                    STS-1            9                       1.5 x 10^-7
                    STS-3           16                         1 x 10^-7
          
          
          
          
          
          
          
          
          
          
          
          Expires 3/1/1999                                     [Page 86]


          Internet Draft        SONET/SDH Objects      September 1, 1998
          
          
                         Value for x for SONET/SDH VT-Path SES Definition
          
                    Rate            x               Minimum Bit Error Rate
                    =======================================================
                    VT1.5            4                       2 x 10^-6
                    VT2              6                       2 x 10^-6
                    VT3              8                       2 x 10^-6
                    VT6             14                       2 x 10^-6
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          Expires 3/1/1999                                     [Page 87]


          Internet Draft        SONET/SDH Objects      September 1, 1998
          
          
          Table of Contents
          
          
          1 Status of this Memo ...................................    1
          2 Abstract ..............................................    2
          3 The SNMP Network Management Framework .................    3
          4 Overview ..............................................    5
          4.1 Use of the ifTable ..................................    5
          4.2 Use of ifTable for  SONET/SDH  Medium/Section/Line
               Layer ..............................................    6
          4.3 Use of ifTable for SONET/SDH Paths ..................    7
          4.4 Use of ifTable for SONET/SDH VTs/VCs ................    8
          4.5 SONET/SDH Terminology ...............................    9
          5 Object Definitions ....................................   19
          6.1 The SONET/SDH Medium Group ..........................   21
          6.2 The SONET/SDH Section Group .........................   26
          6.2.1 The SONET/SDH Section Current Group ...............   26
          6.2.2 The SONET/SDH Section Interval Group ..............   29
          6.3 The SONET/SDH Line Group ............................   32
          6.3.1 The SONET/SDH Line Current Group ..................   32
          6.3.2 The SONET/SDH Line Interval Group .................   35
          6.4 The SONET/SDH Far End Line Group ....................   38
          6.4.1 The SONET/SDH Far End Line Current Group ..........   38
          6.4.2 The SONET/SDH Far End Line Interval Group .........   41
          6.5 The SONET/SDH Path Group ............................   44
          6.5.1 The SONET/SDH Path Current Group ..................   44
          6.5.2 The SONET/SDH Path Interval Group .................   47
          6.6 The SONET/SDH Far End Path Group ....................   50
          6.6.1 The SONET/SDH Far End Path Current Group ..........   50
          6.6.2 The SONET/SDH Far End Path Interval Group .........   52
          6.7 The SONET/SDH Virtual Tributary Group ...............   55
          6.7.1 The SONET/SDH VT Current Group ....................   55
          6.7.2 The SONET/SDH VT Interval Group ...................   58
          6.8 The SONET/SDH Far End VT Group ......................   61
          6.8.1 The SONET/SDH Far End VT Current Group ............   61
          6.8.2 The SONET/SDH Far End VT Interval Group ...........   63
          6.9 Conformance Information .............................   66
          6.10 Compliance Statements ..............................   66
          6 Acknowledgments .......................................   76
          7 Security Considerations ...............................   76
          8 References ............................................   77
          9 Author's Address ......................................   81
          10 Full Copyright Statement .............................   82
          
          
          
          
          
          
          
          Expires 3/1/1999                                     [Page 88]