SUMMARYTwo synchronous transmission multi-channel multi-access protocols for high-speed network architecture are studied in this paper. Analytic discrete time Markovian models are developed for ÿnite number of stations and ÿnite number of channels for the symmetric and asymmetric access rights proposed protocols. The e ect of receiver collision phenomenon is examined and analysed on the performance measures evaluation and estimated by the probability of packet rejection at destination. Also, numerical results are presented for comparison for various numbers of data channels and stations.