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Apply Erlang model to this problem?

  • This topic has 2 replies, 1 voice, and was last updated 13 years ago by Prathap Chintapally.
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  • #37459 Reply
    DAR
    Guest

    Could someone offer an opinion as to whether and how the Erlang model can be applied to the following problem:

    A simple telephone system consists of two end offices and a single
    toll office to which each end office is connected by a 1-MHz
    full-duplex trunk. The average telephone is used to make four calls per 8-hour workday. The mean call duration is 6 min. Ten percent of the calls are long-distance (i.e., pass through the toll office). What is the maximum number of telephones an end office can support? (Assume 4 kHz per circuit.)

    #37460 Reply
    Pankaj
    Guest

    4 call in 8 hours give you 0.5 calls in Busy hour. The BHCA of 0.5 multiplied by 360 seconds of Call hold time gives you 0.05 erlang traffic per subscriber.
    as 10% traffic goes through the toll, it means 0.005 erlang per sub in busy hour is the traffic requirement.

    1 MHz i am assuming half E1 that gives 16 servers. (assuming PCM with 64 kbps time slot). 16 timeslots will give you almost 5 erlangs (4.8 er). 4.8 divided by 0.005 gives you around 960 subscribers.

    #37461 Reply
    Prathap Chintapally
    Guest

    Really GSM technology uses Diversity system for better Quality.if yes ,when we remove div RF cable why we get Trx faulty”
    and one more is
    how to remove the bts internal alm”Rx level differ too much betveen main and diversity”

    and could you suggest a good book on GSM that for telecom engg

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