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Extending Point-to-Point Protocol (PPP) over Synchronous Optical NETwork/Synchronous Digital Hierarchy (SONET/SDH) with virtual concatenation, high order and low order payloads
RFC 3255

Document type: RFC - Proposed Standard (April 2002)
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, html

IETF State: WG Document
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IESG State: RFC 3255 (Proposed Standard)
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Network Working Group                                           N. Jones
Request for Comments: 3255                                 Agere Systems
Category: Standards Track                                      C. Murton
                                                         Nortel Networks
                                                              April 2002

    Extending Point-to-Point Protocol (PPP) over Synchronous Optical
     NETwork/Synchronous Digital Hierarchy (SONET/SDH) with virtual
            concatenation, high order and low order payloads

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2002).  All Rights Reserved.

Abstract

   This document describes an extension to the mapping of Point-to-Point
   Protocol (PPP) into Synchronous Optical NETwork/Synchronous Digital
   Hierarchy (SONET/SDH) to include the use of SONET/SDH SPE/VC virtual
   concatenation and the use of both high order and low order payloads.

Table of Contents

   1.  Introduction................................................1
   2.  Rate Comparisons............................................2
   3.  Physical Layer Requirements.................................4
   4.  Standards Status............................................5
   5.  Security Considerations.....................................5
   6.  References..................................................6
   7.  Acknowledgements............................................6
   8.  Authors' Addresses..........................................7
   9.  Full Copyright Statement....................................8

1. Introduction

   Current implementations of PPP over SONET/SDH are required to select
   transport structures from the relatively limited number of
   contiguously concatenated signals that are available.

Jones & Murton              Standards Track                     [Page 1]
RFC 3255              Extending PPP over SONET/SDH            April 2002

   The only currently supported SONET/SDH SPE/VCs in RFC 2615 [3] are
   the following:

          SONET                   SDH
      ----------------------------------------
      STS-3c-SPE                  VC-4
      STS-12c-SPE                 VC-4-4c
      STS-48c-SPE                 VC-4-16c
      STS-192c-SPE                VC-4-64c

   Note that VC-4-4c and above are not widely supported in SDH networks
   at present.

   The use of virtual concatenation means that the right size SONET/SDH
   bandwidth can be selected for PPP links.

   For the convenience of the reader, the equivalent terms are listed
   below:

          SONET                   SDH
      ---------------------------------------------
      SPE                         VC
      VT (1.5/2/6)                Low order VC (VC-11/12/2)
      STS SPE                     Higher Order VC (VC-3/4/4-Nc)
      STS-1 frame                 STM-0 frame (rarely used)
      STS-1 SPE                   VC-3
      STS-1-nv                    VC-3-nv (virtual concatenation)
      STS-1 payload               C-3
      STS-3c frame                STM-1 frame, AU-4
      STS-3c SPE                  VC-4
      STS-3c-nv                   VC-4-nv (virtual concatenation)
      STS-3c payload              C-4
      STS-12c/48c/192c frame      STM-4/16/64 frame, AU-4-4c/16c/64c
      STS-12c/48c/192c-SPE        VC-4-4c/16c/64c
      STS-12c/48c/192c payload    C-4-4c/16c/64c

   This table is an extended version of the equivalent table in RFC 2615
   [3].  Additional information on the above terms can be found in
   Bellcore GR-253-CORE [4], ANSI T1.105 [5], ANSI T1.105.02 [6] and
   ITU-T G.707 [7].

2. Rate Comparisons

   Currently supported WAN bandwidth links for PPP over SONET/SDH:

Jones & Murton              Standards Track                     [Page 2]
RFC 3255              Extending PPP over SONET/SDH            April 2002

         ANSI                   ETSI
      -----------------------------------------------------
        STS-3c (150Mbit/s)     STM-1 (150Mbit/s)
        STS-12c (620Mbit/s)    STM-4 AU-4-4c (620Mbit/s)
        STS-48c (2.4Gbit/s)    STM-16 AU-4-16c (2.4Gbit/s)
        STS-192c (9.6Gbit/s)   STM-64 AU-4-64c (9.6Gbit/s)

   Note that AU-4-4c and AU-4-16c are not generally available in SDH
   networks at present.

   With virtual concatenation the following additional WAN bandwidth
   links would be available for PPP over SONET/SDH:

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