Performance analysis of a broadcast star local area network with collision avoidance

The performance of a broadcast star network is analyzed, under the assumption of synchronous operation of a network. An exact analysis for a broadcast star network with an infinite station population, an exact analysis for a small network with a finite station population, and an approximate analysis for a large network with a finite station population are presented. In synchronous operation, the channel time is slotted, and stations transmit only at the beginning of a slot. The throughput and the distribution of transmission delays are obtained. It is shown through simulations that a broadcast star operating under synchronous mode yields better performance than when operating under asynchronous mode, where transmissions of packets are not confined to the beginning of slots and stations start transmission at any time