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Performance Analysis of the IEEE 802.5 Token Ring

Peden, Jeffery
Peden, Jeffery
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. Note: Abstract extracted from PDF file via OCR
Date Received
University of Virginia, Department of Computer Science, 1986
Published Date
Libra Open Repository
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