Analysis of synchronous and asynchronous traffic in an FDDI network

Earlier work on the analysis of the FDDI protocol separately analyzed either synchronous traffic or asynchronous traffic because of the analytical complexity. However, both synchronous and asynchronous traffic are actually correlated; the independent analysis of either one would lose some correctness. The present authors present an approach to analyze all the traffic simultaneously. Within the approach, they still analyze both queues separately, but correlate them by a pseudo ring latency to reflect the dependencies between the traffic. An iterative method is used to numerically obtain the state probabilities for both traffic. Also, by a pseudo conservation law, the mean waiting times of both traffic are obtained. The results show very good agreement with simulation.<>