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Priorities and Dynamic Ring Membership in an 802.4 Network

Gorur, Mangala
Gorur, Mangala
Local area networks using the token bus technology are anticipated to meet the needs for oifice factory and process control automation applications. The IEEE 802.4 token bus protocol is emerging as the popular standard for these applications and is the only token bus standard that offers broadband facilities. The enormous interest in this protocol is due to the following features: high reliability, prioritized transmissions, deterministic access of the medium and robust error detection and recovery. This thesis studies the issues of prioritized traffic, dynamic ring membership and transient loading conditions in a token bus network by analytic and simulation modeling. An analytic model has been developed to predict the timer settings that ensure the implementation of the priority feature as specified by the IEEE 802.4 standard. This is very useful in determining the range of network throughput over which optimum service can be obtained for messages of a certain priority. The issue of dynamic ring membership of a station has been studied and an analytic model has been developed to predict the delivery times of messages. This study gave us better insight into the issues pertaining to the transient ring membership of a station in an 802.4 network. and the benefits of a station being a permanent member of the logical ring as opposed to being a transient member. Simulation stu -dies have been conducted to observe the robustness of the protocol under transient loading conditions. Results of this study illustrate the robustness of the protocol under heavy transient loads. Note: Abstract extracted from PDF file via OCR
University of Virginia, Department of Computer Science, 1986
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