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Providing Integrated Services over Low-bitrate Links (RFC2689)

IP.com Disclosure Number: IPCOM000003281D
Original Publication Date: 1999-Sep-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 11 page(s) / 32K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

C. Bormann: AUTHOR

Abstract

This document describes an architecture for providing integrated services over low-bitrate links, such as modem lines, ISDN B- channels, and sub-T1 links. It covers only the lower parts of the Internet Multimedia Conferencing Architecture [1]; additional components required for application services such as Internet Telephony (e.g., a session initiation protocol) are outside the scope of this document. 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 protocols used between routers (or between hosts and routers), and announcement protocols used by applications to allow this negotiation to take place.

This text was extracted from a ASCII document.
This is the abbreviated version, containing approximately 9% of the total text.

Network Working Group C. Bormann

Request for Comments: 2689 Universitaet Bremen TZI

Category: Informational September 1999

Providing Integrated Services over Low-bitrate Links

Status of this Memo

This memo provides information for the Internet community. It does

not specify an Internet standard of any kind. Distribution of this

memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (1999). All Rights Reserved.

Abstract

This document describes an architecture for providing integrated

services over low-bitrate links, such as modem lines, ISDN B-

channels, and sub-T1 links. It covers only the lower parts of the

Internet Multimedia Conferencing Architecture [1]; additional

components required for application services such as Internet

Telephony (e.g., a session initiation protocol) are outside the scope

of this document. 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 protocols used between routers

(or between hosts and routers), and announcement protocols used by

applications to allow this negotiation to take place.

1. Introduction

As an extension to the "best-effort" services the Internet is well-

known for, additional types of services ("integrated services") that

support the transport of real-time multimedia information are being

developed for, and deployed in the Internet. Important elements of

this development are:

- parameters for forwarding mechanisms that are appropriate for

real-time information [11, 12],

- a setup protocol that allows establishing special forwarding

treatment for real-time information flows (RSVP [4]),

- a transport protocol for real-time information (RTP/RTCP [6]).

In addition to these elements at the network and transport levels of

the Internet Multimedia Conferencing Architecture [1], further

components are required to define application services such as

Internet Telephony, e.g., protocols for session initiation and

control. These components are outside the scope of this document.

Up to now, the newly developed services could not (or only very

inefficiently) be used over forwarding paths that include low-bitrate

links such as 14.4, 33.6, and 56 kbit/s modems, 56 and 64 kbit/s ISDN

B-channels, or even sub-T1 links. The encapsulation formats used on

these links are not appropriate for the simultaneous transport of

...