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PPP over Simple Data Link (SDL) using SONET/SDH with ATM-like framing (RFC2823)

IP.com Disclosure Number: IPCOM000003421D
Original Publication Date: 2000-May-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 23 page(s) / 56K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Carlson: AUTHOR [+4]

Abstract

The Point-to-Point Protocol (PPP) [1] provides a standard method for transporting multi-protocol datagrams over point-to-point links, and RFCs 1662 [2] and 2615 [3] provide a means to carry PPP over Synchronous Optical Network (SONET) [4] and Synchronous Digital Hierarchy (SDH) [5] circuits. This document extends these standards to include a new encapsulation for PPP called Simple Data Link (SDL) [6]. SDL provides a very low overhead alternative to HDLC-like encapsulation, and can also be used on SONET/SDH links.

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 5% of the total text.

Network Working Group J. Carlson

Request for Comments: 2823 Sun Microsystems, Inc.

Category: Experimental P. Langner

Lucent Technologies Microelectronics Group

E. Hernandez-Valencia

J. Manchester

Lucent Technologies

May 2000

PPP over Simple Data Link (SDL)

using SONET/SDH with ATM-like framing

Status of this Memo

This memo defines an Experimental Protocol for the Internet

community. It does not specify an Internet standard of any kind.

Discussion and suggestions for improvement are requested.

Distribution of this memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (2000). 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, and

RFCs 1662 [2] and 2615 [3] provide a means to carry PPP over

Synchronous Optical Network (SONET) [4] and Synchronous Digital

Hierarchy (SDH) [5] circuits. This document extends these standards

to include a new encapsulation for PPP called Simple Data Link (SDL)

[6]. SDL provides a very low overhead alternative to HDLC-like

encapsulation, and can also be used on SONET/SDH links.

Applicability

This specification is intended for those implementations that use PPP

over high speed point-to-point circuits, both with so-called "dark

fiber" and over public telecommunications networks. Because this

enhanced PPP encapsulation has very low overhead and good hardware

scaling characteristics, it is anticipated that significantly higher

throughput can be attained when compared to other possible SONET/SDH

payload mappings, and at a significantly lower cost for line

termination equipment.

SDL is defined over other media types and for other data link

protocols, but this specification covers only the use of PPP over SDL

on SONET/SDH.

The use of SDL requires the presentation of packet length information

in the SDL header. Thus, hardware implementing SDL must have access

to the packet length when generating the header, and where a router's

input link does not have this information (that is, for non-SDL input

links), the router may be required to buffer the entire packet before

transmission. "Worm-hole" routing is thus at least problematic with

SDL, unless the input links are also SDL. This, however, does not

appear to be a great disadvantage on modern routers due to the

general requirement of length information in other parts of the

system, notably in queuing and congestion control strategies such as

Weighted Fair Queuing [7] and Random Early Detect [8].

This d...