Performance Analysis of the IEEE 802.5 Token Ring

Author:Peden, Jeffery, Department of Computer ScienceUniversity of Virginia

Currently three IEEE local area networks (the 802.3 contention bus, 802.4 token bus, and 802.5 token ring) are receiving much attention in industry. Interest in 802.5 is due to its applicability to real-time control and monitoring functions, and its potential use of mixed media in various operating environments. This thesis studies the performance of the 802.5 token ring under various network configurations. Measurements of interest include token cycle time, mean packet delivery delay, total throughput. and queue lengths. Performance data are presented for varying numbers of ring stations, packet sizes, and offered loads, and the ring's low protocol overhead and effective use of pipelining are discussed. The performance of the token ring when handling multiple priority traffic is also studied, and it is shown that the priority of a message has no significant impact on its relative level of service. An analytic model of network performance is developed that predicts token cycle time. delay, maximum throughput, and queue lengths. This model is shown to be an excellent predictor of mean network performance. and comparisons are given between simulation results and analytic predictions.
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Source Citation:

Peden, Jeffery. "Performance Analysis of the IEEE 802.5 Token Ring." University of Virginia Dept. of Computer Science Tech Report (1986).

University of Virginia, Department of Computer Science
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