Performance analysis of a large scale ATM switch with input and output buffers

The maximum throughput of a single-stage non-blocking input-queued switch such as the sort-banyan network is shown to be 0.586 under the uniform traffic model. It can be increased to 0.88 or 0.97 respectively if the switch is speeded up by a factor of 2 or 3. Hui and Lee (1992) showed that, for a large scale three-stage switch built with sort-banyan switch modules, the maximum throughput reduces to 0.458. The analysis was performed based on the assumption that the number of middle-stage switch modules is equal to the number of input/output links of a switch module. In the paper, the authors study the effect of increasing the number of middle-stage switch modules and speeding up the switch. Numerical results are obtained and verified by computer simulations for various combinations. For example, with a speedup factor of 2, the maximum throughput can be improved to 0.85 if the number of middle-stage switch modules is doubled.<
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