The performance of a multi-access protocol is strongly dependent upon the traffic model and network loading. It has been shown that random access protocols such as CSMA/CD are very efficient at low loading, while reservation protocols exhibit better throughput-delay performance at medium and high loading ranges. The CSMA/CD-based two channel reservation network (TCRN) combines the advantages of both random access as well as reservation protocols to give a better performance than CSMA/CD for identical bandwidths. Recently attention has been given to protocols which use priority systems.In this paper we describe and compare the TCRN class of networks: TCRN and two priority TCRN-based protocols, first with a preemptive priority (TCRN/PP) and second with a non-preemptive priority (TCRN/NPP), to other popular data networks. In order to examine the behavior of our protocols under time-constrained conditions, we 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.
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