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# Extended Erlang B

Viewing 8 posts - 1 through 8 (of 8 total)
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Brian
Guest

I’m familiar with the Erlang B anc C equations but what is the formula for the Extended Erlang B (which includes call retries)? What’s a good reference book for practical telecom engineering?

Thanks,
Brian

Ayal
Guest

Hello Brian,

I think I have the answer for you.

You are welcomed to contact me at: Ayal@gilat.com

Menachem Shapira
Guest

Shalom Ayal,

Could you please send me any ref. of traffic provisioning calculations in particular regarding IP (VoIP).

Thanks.

Nabil Ahmed
Guest

Ayal,

I am interested in knowing the Extended Erlang B formula. I appreciate your assistance

My e-mail is datavision@usa.net

Thanks,
Nabil Ahmed

Imran Bhatti
Guest

Ayal,

Could you please send me any ref. of traffic provisioning calculations. I’m also not familiar with the Erlang B anc C equations.

Actually, I am planning to model SVCs and PVCs in an ATM network, with these equations.

Thanks,
Imran Bhatti

Mwenya
Guest

Ayal,
Could you please send me extended erlang B formula as well as erlang B formula
Contact me at Mwenya_m@excite.com

Mwenya.

Mwenya
Guest

Ayal,
Could you please send me extended erlang B formula as well as erlang B formula
Contact me at Mwenya_m@excite.com

Mwenya.

Santy
Guest

Erlang B
Calculates traffic in loss systems. If a request is not served when it is offered to the resource then it is lost. These systems can be considered as non-queued. This model assumes the blocked traffic is immediately cleared.
Erlang B formula
:Eb(0, t) = 1 \\,
:Eb(r,t) = { {t Eb(r-1,t)} \\over {r+t Eb(r-1,t)} } \\,
where:
Eb is the probability of blocking
r is the number of resources.
t is the number of Erlang offered

Extended Erlang B
This formula is essentially Erlang B, but assumes that a certain percentage of the system, when blocked will immediately represent themselves to the system. This formula can account for this retry percentage.

Viewing 8 posts - 1 through 8 (of 8 total)
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