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A Comment on Packet Video Remote Conferencing and the Transport/Network Layers (RFC1453)

IP.com Disclosure Number: IPCOM000002281D
Original Publication Date: 1993-Apr-01
Included in the Prior Art Database: 2000-Sep-12
Document File: 9 page(s) / 22K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

W. Chimiak: AUTHOR

Abstract

The new generation of multimedia applications demands new features and new mechanisms for proper performance. ATM technology has moved from concept to reality, delivering very high bandwidths and new capabilities to the data link layer user. In an effort to anticipate the high bandwidth-delay data link layer, Delta-t [Delta-t], NETBLT [RFC 988], and VMTP [RFC 1045] were developed. The excellent insights and mechanisms pioneered by the creators of these experimental Internet protocols were used in the design of Xpress Transfer Protocol (XTP) [XTP92] with the goal of eventually delivering ATM bandwidths to a user process. This RFC is a vehicle to inform the Internet community about XTP as it benefits from past Internet activity and targets general-purpose applications and multimedia applications with the emerging ATM networks in mind.

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Network Working Group W. Chimiak

Request for Comments: 1453 BGSM

April 1993

A Comment on Packet Video Remote Conferencing and the

Transport/Network Layers

Status of this Memo

This memo provides information for the Internet community. It does

not specify an Internet standard. Distribution of this memo is

unlimited.

Abstract

The new generation of multimedia applications demands new features

and new mechanisms for proper performance. ATM technology has moved

from concept to reality, delivering very high bandwidths and new

capabilities to the data link layer user. In an effort to anticipate

the high bandwidth-delay data link layer, Delta-t [Delta-t], NETBLT

[RFC 988], and VMTP [RFC 1045] were developed. The excellent

insights and mechanisms pioneered by the creators of these

experimental Internet protocols were used in the design of Xpress

Transfer Protocol (XTP) [XTP92] with the goal of eventually

delivering ATM bandwidths to a user process. This RFC is a vehicle

to inform the Internet community about XTP as it benefits from past

Internet activity and targets general-purpose applications and

multimedia applications with the emerging ATM networks in mind.

1. Introduction

Networking is no longer synonymous with analog telephony. High-

performance lower-layer networks have made possible exciting new

applications: collaboratory environments, distributed client/server

computing, remote conferencing, teleclassrooms, and distributed

life-sciences imaging. These applications normally demand a great

deal of bandwidth and often create operating system bottlenecks.

Enabling these new multimedia applications entails delivering

bandwidth to the applications, not just having bandwidth available on

the network. This statement may appear obvious, but often solutions

at the transport layer are satisfied by having bandwidth at that

layer without sufficient sensitivity to higher-layer access to the

bandwidth. The unavailability of bandwidth at upper layers is

becoming the real issue as the networks are becoming a high-

performance virtual backplane without concomitant high-performance

control schemes. It appears that new services are needed that

require communication with all layers. The ATM architecture calls

for such an integrated control scheme.

2. Remote Conferencing

The challenges of remote conferencing is an application whose

challenges may be met at the data link layer by the emergi...