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    Consider a simple telephone network consisting of two end offices and one intermediate switch with a 1-MHz full-duplex trunk between each end office and the intermediate switch. The average telephone is used to make four phone 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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    The amount of calls per hour is:
    4/8 = 0.5 calls/hr

    So with a mean usage of 6 minutes, the available number of telephones that can share a ...

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