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How many lines do I need?

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  • #45270 Reply

    Can someone tell me how many T1 circuits I will need to accommodate 37 offices if each office average 11 calls per hour, and each call lasts about 7 minutes? I am rolling our a VoIP solution, but not sure how many T1s I need to order.

    #45271 Reply

    Total erlang traffic =
    11*7*37/60 = 47.48

    So at 2% blocking probablity for 47.48 erlang you need 58 circuits.

    1 T1 line consists of 24 circuits, If one circuit is reserved for signalling remaining 23 can be used for voice.

    So, Number of T1 requird = 58/23 = 3 (approx)

    #45272 Reply

    Thanks Prateek,
    I understood the math but using the free calculators gave me a wrong number.

    #45273 Reply

    hi Radeoman

    becoz calculator uses 11*7*37/3600

    that traffic will be lesser than the required.

    thanx hope that will help


Viewing 4 posts - 1 through 4 (of 4 total)
Reply To: How many lines do I need?
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