2535	 The Effects of Multiplexing on a Computer-Communications System	 A study is made of the way in which asynchronous time division multiplexing changes the stochastic nature of the arrival process from a user to the computer and consequently affects the performance of a time-shared computer-communications system. It is concluded that while for certain values of system parameters there is noticeable improvement in the performance of the computer model in the sense that time-shared scheduling delays are reduced these improvements are offset by the transmission delays imposed by multiplexing so that there may be little or no change in the computer-communications system performance. Analytical and simulation results are based on the model of the computer-communications system being an M D queue the multiplexor in tandem with a single exponential server the computer . Analytical results include a general description of the output process of an M D queue and the conditions under which this output process is approximately Poisson. computer communications time-sharing multiplexing scheduling algorithms operating systems
