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Number of lines from Erlang B

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  • #37739 Reply
    Damir
    Guest

    Hi,
    I need formula from which I can calculate number of lines if I know blocking/loss probability and traffic load in erlang?
    Thanks,
    Damir

    #37740 Reply
    Vishad
    Guest

    Hi Damir,

    The following is the estimated Erlang B Formual :

    E= 1/ ( 1 + N/A + N(N-1)/A^2 + N(N-1)(N-2)/A^3 +… + N!/A^2)

    Where E = Probability of Loss, N = Number of Trunks, and A= Carried Traffic.

    Unfortunately, to calculate the number of lines, you will have to use the formula as is, and estimate the number of lines until E approximates your Loss Probability.

    #37741 Reply
    Vishad
    Guest

    Sorry, error in Formula… the correct polynomial is :

    E= 1/ ( 1 + N/A + N(N-1)/A^2 + N(N-1)(N-2)/A^3 +… + N!/A^N)

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Reply To: Number of lines from Erlang B
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