 This topic has 7 replies, 1 voice, and was last updated 14 years, 11 months ago by Santy.

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BrianGuest
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,
BrianAyalGuestMenachem ShapiraGuestShalom Ayal,
Could you please send me any ref. of traffic provisioning calculations in particular regarding IP (VoIP).
Thanks.
Nabil AhmedGuestAyal,
I am interested in knowing the Extended Erlang B formula. I appreciate your assistance
My email is datavision@usa.net
Thanks,
Nabil AhmedImran BhattiGuestAyal,
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 BhattiMwenyaGuestAyal,
Could you please send me extended erlang B formula as well as erlang B formula
Contact me at Mwenya_m@excite.comMwenya.
MwenyaGuestAyal,
Could you please send me extended erlang B formula as well as erlang B formula
Contact me at Mwenya_m@excite.comMwenya.
SantyGuestErlang 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 nonqueued. This model assumes the blocked traffic is immediately cleared.
Erlang B formula
:Eb(0, t) = 1 \\,
:Eb(r,t) = { {t Eb(r1,t)} \\over {r+t Eb(r1,t)} } \\,
where:
Eb is the probability of blocking
r is the number of resources.
t is the number of Erlang offeredExtended 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. 
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