Abstract
This lecture discusses a queuing analysis application of some company’s teletype system performed by an Operations Research consultant firm. The company was faced with the problem of congestion in the communication system resulting in delay in massage transmission to a degree regarded as undesirable by management. Two new communication systems were suggested the efficiency of which had to be compared with the old one in a theoretical manner, i.e. before they were actually put into effect. It can be shown that only a very small amount of data is needed in order to evaluate various significant parameters of the three systems to be investigated. Yet most of them, e.g. the average number of messages in the system, are misleading when used as a measure of efficiency. However the average delay time per message delayed turns out to serve management best for the purpose of comparison. Management may now take account of other criteria, especially various kinds of costs, and can select the transmission system that suits best.
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