Abstract
We present an analytic model for the performance evaluation of interconnected local area networks. The system is decomposed into three elementary subnetworks—routers, Ethernets with 10 Mbps capacity, and an FDDI backbone with 100 Mbps capacity—each of which is modeled by a GI/G/1 queue. Routers are modeled as polling machines with the assumption that packets arriving at the router are not copied when they are moved from input queues to output queues. An approximate analysis based on the first two moments of interarrivai time and packet length distribution is applied to each subnetwork to obtain the performance. A variety of studies are conducted to evaluate those parameters affecting the performance of system. The optimum network structure with least waiting time could be found from our model by varying the number of routers connected to the FDDI and the number of Ethernets connected to routers.
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