In Proceedings of ACM Multimedia ' 94 Experiments with the Tenet Real - Time Protocol Suite on the Sequoia 2000 Wide Area Network

Emerging distributed multimedia applications have stringent performance requirements in terms of bandwidth, delay, delay-jitter, and loss rate. The Tenet real-time protocol suite provides the services and mechanisms for delivering such performance guarantees, even during periods of high network load and congestion. The protocols achieve this by using resource management, connection admission control, and appropriate packet service disciplines inside the network. The Sequoia 2000 network employs the Tenet Protocol Suite at each of its hosts and routers making it one of the rst wide area packet-switched networks to provide endto-end per-connection performance guarantees. This paper presents experiments with the Tenet protocols on the Sequoia 2000 network including measurements of the performance of the protocols, the service received by real multimedia applications using the protocols, and comparisons with the service received by applications that use the Internet protocols (UDP/IP). We conclude that the Tenet protocols successfully protect the real-time channels from other tra c in the network, including other real-time channels, and allow channels to continue to meet their performance guarantees, even when the network is highly loaded. 1 This research was supported by the National Science Foundation and the Defense Advanced Research Projects Agency (DARPA) under Cooperative Agreement NCR-8919038 with the Corporation for National Research Initiatives, by AT&T Bell Laboratories, Hitachi, Ltd., Hitachi America, Ltd., Paci c Bell, the University of California under a MICRO grant, and the International Computer Science Institute. The Sequoia 2000 Project was sponsored by the University of California and Digital Equipment Corporation under Research Grant #1243, and by a consortium of government and industrial partners, including: the California Department of Water Resources, United States Geological Survey, Construction Engineering Research Laboratory (CERL) of the U.S. Army Corps of Engineers, the National Aeronautics and Space Administration (NASA), Epoch Systems, Inc., Hewlett-Packard, Hughes Aircraft Company, Metrum Corporation, PictureTel Corporation, Research Systems Inc., Science Applications International Corporation, Siemens Inc., and TRW. The views and conclusions contained in this document are those of the authors, and should not be interpreted as representing o cial policies of the U.S. Government or any of the sponsoring organizations.