RFC 2689 (rfc2689) - Page 1 of 14

Providing Integrated Services over Low-bitrate Links

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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]).




Bormann                      Informational
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