PPP over SONET/SDH
RFC 1619
Document | Type |
RFC - Proposed Standard
(May 1994; No errata)
Obsoleted by RFC 2615
|
|
---|---|---|---|
Author | William Simpson | ||
Last updated | 2013-03-02 | ||
Stream | Internet Engineering Task Force (IETF) | ||
Formats | plain text html pdf htmlized (tools) htmlized bibtex | ||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 1619 (Proposed Standard) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | (None) | ||
Send notices to | (None) |
Network Working Group W. Simpson Request for Comments: 1619 Daydreamer Category: Standards Track May 1994 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. 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 Heirarchy (SDH) circuits. This document is the product of the Point-to-Point Protocol Working Group of the Internet Engineering Task Force (IETF). Comments should be submitted to the ietf-ppp@merit.edu mailing list. Applicability This specification is intended for those implementations which desire to use the PPP encapsulation over high speed private point-to-point links, such as intra-campus single-mode fiber which may already be installed and unused. Because the PPP encapsulation has relatively low overhead, it is anticipated that significantly higher throughput can be attained compared to other SONET/SDH payload mappings, at a significantly lower cost for line termination equipment. Simpson [Page i] RFC 1619 PPP over SONET/SDH May 1994 Table of Contents 1. Introduction .......................................... 1 2. Physical Layer Requirements ........................... 1 3. Framing ............................................... 2 4. Configuration Details ................................. 3 SECURITY CONSIDERATIONS ...................................... 3 REFERENCES ................................................... 3 ACKNOWLEDGEMENTS ............................................. 3 CHAIR'S ADDRESS .............................................. 4 AUTHOR'S ADDRESS ............................................. 4 Simpson [Page ii] RFC 1619 PPP over SONET/SDH May 1994 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. The Synchronous Optical Network (SONET) [3] is an octet-synchronous multiplex scheme that defines a family of standard rates and formats. Despite the name, it is not limited to optical links. Electrical specifications have been defined for single-mode fiber, multi-mode fiber, and CATV 75 ohm coaxial cable. The transmission rates are integral multiples of 51.840 Mbps, which may be used to carry T3/E3 bit-synchronous signals. The allowed multiples are currently specified as STS-1 51.840 STS-18 933.120 STS-3 155.520 STS-24 1,244.160 STS-9 466.560 STS-36 1,866.240 STS-12 622.080 STS-48 2,488.320 The CCITT Synchronous Digital Heirarchy (SDH) defines a subset of SONET transmission rates beginning at 155.520 Mbps [5]. SONET SDH equivalent STS-3c STM-1 STS-12c STM-4 STS-48c STM-16 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 presents an octet interface to the physical layer. There is no provision for sub-octets to be supplied or accepted. Simpson [Page 1] RFC 1619 PPP over SONET/SDH May 1994 The octet stream is mapped into the SONET/SDH Synchronous Payload Envelope (SPE), with the octet boundaries aligned with the SPE octet boundaries. No scrambling is needed during insertion into the SPE. The Path Signal Label (C2) is intended to indicate the contents ofShow full document text