We derive the throughput as a function of offered load in the case of a single local area network in which up to three different CSMA protocols (1-persistent, non-persistent and virtual time) are in use simultaneously. Each protocol is used by a fraction of the total number of stations in the network and ideally each station is allowed to switch from one protocol to the other to maximize throughput. It has been found that under certain circumstances of traffic, propagation time and mixtures of stations from different protocols, the total throughput of the heterogeneous network is greater than the throughput of each single CSMA protocol. Expressions have also been derived for the contribution of each protocol type to the global throughput of the network.
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