Time constrained performance of a two channel reservation protocol for local networks

An efficient reservation-based carrier sense multiple access with collision-detection (CSMA/CD) protocol for two types of priority packets is presented. Type 1 packets are of relatively short duration, need a very quick response time, and have a high arrival rate. Type 2 packets are of longer duration, do not require as fast a response time, and have a low arrival rate. Expressions are developed for both the throughput and delay performance of two channel reservation network (TCRN), two channel reservation network with a preemptive priority, (TCRN/PP), and two channel reservation network with a nonpreemptive priority (TCRN/NPP) protocols. To examine the behavior of the protocols under time-constrained conditions, the authors check the percentage of voice packets which are transmitted within a given amount of time after their generation at a transmitting station and the voice capacity, both under different operating conditions. The results show that the channel is efficiently used to minimize the average delay for the data portion and to maintain as many voice stations as possible.<>