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Erlang B .v. Poisson

Viewing 6 posts - 1 through 6 (of 6 total)
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  • #33235 Reply
    WEN
    Guest

    Is there anybody who knows the difference between Erlang table and Poisson Capacity table, which is better to predict trunk capacity.

    thanks.

    WEN

    #33236 Reply
    Tom Howard
    Guest

    Erlang B and Poisson (or Molina, as it is known in Europe) are similar, with one major exception.

    Erlang B assumes that blocked calls leave the system immediately and do not return. Poisson assumes that blocked calls remain in the system for the length of their call duration, had they been answered.

    Poisson’s assumption is usually wrong, but in practice, Molina can be used to take retries into account; that is, calls which return immediately if they are blocked (people redialling if they hear busy).

    For low blocking levels, the difference is probably negligible. I prefer to use Extended Erlang B to model retries though, because it allows you to set the percentage of calls which will retry if they encounter busy.

    Cheers,
    Tom.

    #33237 Reply
    WEN
    Guest

    Tom,

    Thank you for your response. Could you tell me where I can find the extended Erlang B table.

    Thank you in advance.

    WEN

    #33238 Reply
    Tom Howard
    Guest

    Hi,

    I’ve never seen the Extended Erlang B table published (as a table). Unlike Erlang B, I don’t think it’s on the ITU Web site.

    There is an online calculator on this web site so you can try the model out. Click here to try it.

    You could make your Extended Erlang B table in an Excel workbook using Erlang for Excel.

    #33239 Reply
    Ruber Castro
    Guest

    Could anybody tell me the Poisson Formula or where can i find it?

    Thanks,

    RC

    #33240 Reply
    BINOD K SINGH
    Guest

    Hi!

    Can you send me a soft copy of the whole Erlang B table and the method to use it.

    Thanks and Regards,

Viewing 6 posts - 1 through 6 (of 6 total)
Reply To: Erlang B .v. Poisson
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