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Class Extensions for PPP over Asynchronous Transfer Mode Adaptation Layer 2 (RFC3337)

IP.com Disclosure Number: IPCOM000010533D
Original Publication Date: 2002-Dec-01
Included in the Prior Art Database: 2002-Dec-13
Document File: 8 page(s) / 15K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

B. Thompson: AUTHOR [+3]

Abstract

The Point-to-Point Protocol (PPP) over Asynchronous Transfer Mode (ATM) Adaptation Layer 2 defines the encapsulation that allows a PPP session to be transported over an ATM virtual circuit using the ATM Adaptation Layer 2 (AAL2) adaptation layer. This document defines a set of class extensions to PPP over AAL2 that implement equivalent functionality to Multi Class Multi Link PPP over a single ATM virtual circuit. Instead of using Multi Link PPP as the basis for fragmentation functionality, this document uses the functionality of the Segmentation and Reassembly Service Specific Convergence Sublayer that is already required as the basic encapsulation format of PPP over AAL2.

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This is the abbreviated version, containing approximately 19% of the total text.

Network Working Group                                        B. Thompson

Request for Comments: 3337                                      T. Koren

Category: Standards Track                                  Cisco Systems

                                                               B. Buffam

                                                         Seaway Networks

                                                           December 2002

                     Class Extensions for PPP over

          Asynchronous Transfer Mode Adaptation Layer 2 (AAL2)

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

   The Point-to-Point Protocol (PPP) over Asynchronous Transfer Mode

   (ATM) Adaptation Layer 2 defines the encapsulation that allows a PPP

   session to be transported over an ATM virtual circuit using the ATM

   Adaptation Layer 2 (AAL2) adaptation layer.  This document defines a

   set of class extensions to PPP over AAL2 that implement equivalent

   functionality to Multi Class Multi Link PPP over a single ATM virtual

   circuit.  Instead of using Multi Link PPP as the basis for

   fragmentation functionality, this document uses the functionality of

   the Segmentation and Reassembly Service Specific Convergence Sublayer

   that is already required as the basic encapsulation format of PPP

   over AAL2.

1. Introduction

   Using AAL2 as an adaptation layer for PPP transport over ATM provides

   a bandwidth efficient transport for IP applications that generate

   small packets.  An example IP application that generates small

   packets is RTP encapsulated voice (Voice over IP).

Thompson, et. al.           Standards Track                     [Page 1]

RFC 3337           Class Extensions for PPP over AAL2      December 2002

   In addition to bandwidth efficiency, real-time applications such as

   voice require low latency.  RFC 2689 [2] describes an architecture

   for providing transport services for real time applications on low

   bit rate links.  The main components of the architecture are: a

   real-time encapsulation format for asynchronous and synchronous low-

   bitrate links, a header compression architecture optimized for real-

   time flows, elements of negotiation ...