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Blocked calls cleared formula is also known as _______ formula.

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Blocked calls cleared formula is also known as _______ formula.

(a) Erlang C

(b) Erlang A

(c) Erlang D

(d) Erlang B

This question was posed to me in an interview.

This interesting question is from Trunking and Grade of Service in division The Cellular Concept – System Design Fundamentals of Wireless/Mobile

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Right option is (d) Erlang B

The best I can explain: Erlang B formula is also known as the blocked calls cleared formula. The Erlang B formula determines the probability that a call is blocked. And, it is a measure of the GOS for a trunked system which provides no queuing for blocked calls.

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