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PPP over SONET/SDH
RFC 2615

Document type: RFC - Proposed Standard (June 1999)
Obsoletes RFC 1619
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, html

IETF State: (None)
Consensus: Unknown
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IESG State: RFC 2615 (Proposed Standard)
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Network Working Group                                          A. Malis
Request for Comments: 2615                  Ascend Communications, Inc.
Obsoletes: 1619                                              W. Simpson
Category: Standards Track                                    DayDreamer
                                                              June 1999

                           PPP over SONET/SDH

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 (1999).  All Rights Reserved.

Abstract

   The Point-to-Point Protocol (PPP) [1] provides a standard method for
   transporting multi-protocol datagrams over point-to-point links.
   This document describes the use of PPP over Synchronous Optical
   Network (SONET) and Synchronous Digital Hierarchy (SDH) circuits.

   This document replaces and obsoletes RFC 1619.  See section 7 for a
   summary of the changes from RFC 1619.

Table of Contents

   1.     Introduction ..........................................    2
   2.     Physical Layer Requirements ...........................    3
   3.     Framing ...............................................    4
   4.     X**43 + 1 Scrambler Description .......................    4
   5.     Configuration Details .................................    6
   6.     Security Considerations ...............................    6
   7.     Changes from RFC 1619 .................................    7
   8.     Intellectual Property .................................    7
   9.     Acknowledgments .......................................    8
   10.    References ............................................    8
   11.    Authors' Addresses ....................................    9
   12.    Full Copyright Statement ..............................   10

Malis & Simpson             Standards Track                     [Page 1]
RFC 2615                  PPP over SONET/SDH                   June 1999

1.  Introduction

   PPP was designed as a standard method of communicating over
   point-to-point links.  Initial deployment has been over short local
   lines, leased lines, and plain-old-telephone-service (POTS) using
   modems.  As new packet services and higher speed lines are introduced,
   PPP is easily deployed in these environments as well.

   This specification is primarily concerned with the use of the PPP
   encapsulation over SONET/SDH links.  Since SONET/SDH is by definition
   a point-to-point circuit, PPP is well suited to use over these links.

   Real differences between SONET and SDH (other than terminology) are
   minor; for the purposes of encapsulation of PPP over SONET/SDH, they
   are inconsequential or irrelevant.

   For the convenience of the reader, we list the equivalent terms below:

       SONET                   SDH
   ---------------------------------------------
   SPE                         VC
   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 payload               C-3
   STS-3c frame                STM-1 frame, AU-4
   STS-3c-SPE                  VC-4
   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

   The only currently supported SONET/SDH SPE/VCs 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

   The keywords MUST, MUST NOT, MAY, OPTIONAL, REQUIRED, RECOMMENDED,
   SHALL, SHALL NOT, SHOULD, and SHOULD NOT are to be interpreted as
   defined in [6].

Malis & Simpson             Standards Track                     [Page 2]
RFC 2615                  PPP over SONET/SDH                   June 1999

2.  Physical Layer Requirements

   PPP treats SONET/SDH transport as octet oriented synchronous links.
   SONET/SDH links are full-duplex by definition.

   Interface Format

      PPP in HDLC-like framing presents an octet interface to the
      physical layer.  There is no provision for sub-octets to be
      supplied or accepted [3][5].

      The octet stream is mapped into the SONET STS-SPE/SDH Higher Order

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