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Reply To: Grade of Service

Nouman Mahmood

Grade of Service (or GOS) is the probability of a subscriber finding
Congestion. Congestion means that all circuits are busy and no
Switch path is available. Thus, a higher GOS means poor Service.

A GOS 0.01 means 1 out of every 100 call is lost(or rejected) due
to congestion on circuits.

Lets assume:

X = (( Traffic in Erlangs)^ n) / n!

SIGMA Y = (( Traffic in Erlangs)^ k) / k! ; k = 0 to k=n


Where n = Total no. of Circuits (or channels) avaible.