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A three-stage ATM switch architecture for high utilization of switch capacity under hot-spot traffic

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1 Author(s)
Jian Ma ; Nokia Res. Center, Helsinki, Finland

Various types of ATM switch fabrics have been proposed and developed. Among them, the output buffered switch known as the Knockout switch has been extensively studied because of its good delay/throughput performance. However, in a hot-spot traffic condition, it is shown in some studies that even if only a small percentage of all requests is destined for a hot-spot, these requests can significantly degrade the system performance. Therefore, to guarantee the switch performance even under the hot-spot traffic the switch has to provide a sufficiently large capacity and buffer size. Thus it will increase significantly the switch cost and complexity. We focus on how to utilize the switch capacity under hot-spot traffic. We propose a three-stage ATM switch architecture with a distributed dynamic routing scheme which uses feedback flow control and a cascade of a sort-network and a shift-network. Our simulation results show that the proposed switch can significantly improve the cell loss performance in hot-spot traffic without increasing the switch capacity in comparison with the random routing schemes in three-stage Clos' (1953) switches, i.e., the proposed switch has a better switch capacity utilization than other switches

Published in:

IEEE ATM Workshop 1997. Proceedings

Date of Conference:

25-28 May 1997

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