A simulation of fiber distributed data interface for token ring lan protocols

The aim of this work has been to graphi cally simulate the protocols employed for 100 Mbps token ring local area network (LAN), using the fiber-optic medium, known as Fiber Distributed Data Interface (FDDI), and to study its performance evaluation. In the computer based simulation, the effort has been made to describe the working of the protocols using graphical, dynamically working models. Also performance characteristics, such as Throughput Vs Token rotation time, Throughput Vs Ring Latency, Throughput Vs Data Arrival Rate are obtained. The asynchronous priority level throughput for different data arrival times are tabulated. From the characteristics, it is found that the relative difference between the ring latency and the token rotation time (TRT) has a significant effect on the maximum total throughput. Also with the higher value of the TRT the throughput increases faster compared to lower TRT values.