This article may be too technical for most readers to understand.(September 2010)
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I'm adding some cleanup tags to this article in response to Wikipedia:Deletion policy/Teletraffic Engineering; Consider whether a random member of the public would know what a circuit group. I agree with other contributors to the above discussion page that this page is worth keeping since there doesn't seem to be another page on the same topic.. Mozzerati
Just to get the heads up on the error in the Pb formula. The subindex X must start from 0, instead of 1.
Erlang's formula doesn't need iteration -- only the Erlang Fixed Point does. Similarly, the Engset formula doesn't need iteration if M is already known. LachlanA 23:53, 5 May 2007 (UTC)