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Abstract
In this paper, we study the performance of an input and output queueing switch with a window scheme and a speed constraint. The performance of a non-blocking ATM switch can usually be improved by increasing the switching speed. Also, the performance of a switch can be improved using a window scheme by relaxing the first-in-firstout (FIFO) queueing discipline in the input queue. Thus, one can expect that a combined scheme of windowing and a speed constraint can improve further the performance of the packet switch. Here, we analyze the maximum throughput of the input and output queueing switch with a speed constraint combined with windowing, and show that it is possible to obtain high throughput with a small increment of speed-up and window size. For analysis, we model the HOL queueing system as a virtual queueing system. By analyzing the dynamics of HOL packets in this virtual queueing model, we obtain the service probability of the HOL server as a function of output contention capabilities. Using the result, we apply the flow conservation relation to this model and obtain the maximum throughput. The analytical results are verified by simulation.
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