Abstract
The authors present the results of a detailed performability evaluation of a network using the IEEE 802.4 protocol. In particular a 30 station IEEE 802.4 token bus network operating in a hostile factory environment is evaluated using stochastic activity networks. Stochastic activity networks, a generalization of stochastic Petri nets, provide a convenient representation for computer networks and are formal enough to permit solution by both analysis and simulation. The evaluation results show (1) that stochastic activity networks are an appropriate model type for evaluating the performability of local-area networks, and (2) that the protocol is extremely tolerant to transient faults such as token losses and noise bursts under moderate network loads. >
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