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# Number of lines from Erlang B

• This topic has 2 replies, 1 voice, and was last updated 18 years, 10 months ago by Vishad.
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• #37739 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 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 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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