"Consider a simple telephone network consisting of two end offices and one intermediate switch with a 1Mhz full duplex trunk between each end office and the intermediate switch. Assume a 4-Khz channel for each voice call. The average telephone is used to make four calls per 8-hour workday, with a mean call duration of six minutes. Ten percent of the calls are long distance. What is the maximum number of telephones an end office can support?"
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