TAILIEUCHUNG - Switching Theory: Architecture and Performance in Broadband ATM Networks phần 10

mance được hiển thị trong hình 9,38 cho N = 16 và trong chuyển đổi các DNNN Shuffleout cho do hiệu suất tốt nhất để định tuyến đường đi ngắn nhất, hiệu quả hơn so với các bit tự định tuyến đơn giản áp dụng trong Shuffle tự định tuyến và tái định tuyến chuyển đổi. | Performance Evaluation and Comparison 379 Figure . Loss performance comparison for different architectures mance is shown in Figure for N 16 and in Figure for N 1024 . With 2 X 4 SEs the Shuffleout switch gives the best performance owing to its shortest path routing which is more effective than the simple bit self-routing applied in the Shuffle Self-Routing and Rerouting switch. With the more complex 4 X 6 SEs the Shuffleout SEs still perform the best with the Shuffle Self-Routing giving a rather close performance especially for large networks. The Dual Shuffle switch gives a significantly higher loss probability for the same network stages. We would like to conclude this loss performance review by comparing the number of stages K required for a variable network size to guarantee a loss performance of 10-6 for the six architectures based on deflection routing just considered the results are given in Figure respectively. All the curves grow almost linearly with the logarithmic switch size. Therefore we can conclude that minimum complexity of the order of Nlog2-N characterizes not only the Dual Shuffle switch as pointed out in Lie94 but all the other architectures based on deflection routing. It can be shown that this property applies also to the Tandem Banyan switch. With this feature established we need to look at the gradient and the stage number for a minimum size switch in order to identify the real optimum architecture. According to our previous considerations Shuffleout requires the minimum amount of hardware in the interconnection network to attain a given loss figure whereas the Shuffle Self-Routing Dual Shuffle needs the maximum amount of hardware with 2 X 4 4 X 6 SEs. The conclusions to draw from these figures are that Shuffleout gives the best cost performance ratio at the expense of implementing shortest-path routing. If bit-by-bit routing is preferred Shuffle SelfRouting and Rerouting with extended routing provide the best solution .

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