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The mean percentage of main-storage cycles required by a multiplexor channel is dependent upon the status of the channel at service time as well as the rate of incoming requests and the interference caused by channels of higher priority. A simple and reasonably accurate method of estimating multiplexor channel interference is discussed. The method is based on a mathematical model which assumes that requests for multiplexor service arrive haphazardly from a number of requesting sources; this assumption is realistic for most teleprocessing applications.
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