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# Grade of Service

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• #33315 Reply
Raymond
Guest

Can anyone define what “grade of service” is?

I think it’s equivalent to the blocking rate but i just want to be sure.

Thanks

#33316 Reply
Joan Neptune
Guest

It is a blocking rate. How many
times out of 100 tries your call
will be completed-for example
a P.01 grade of service-99 out
of 100 calls.

#33317 Reply
Stavros
Guest

It is often called Quality of Service (QoS) and as mentioned before is related to the blocking propability of a call. In other words how many calls out of 100 or 1000 can be blocked. Usually the blocking probability within connected switching equipment in a carrier is 0.001

#33318 Reply
Aldwin Aurelio
Guest

Grade of Service is the percentage of calls that was not immediately served on the first attempt. The call can either be blocked or delayed as can be seen from Erlang B and Erlang C assumption. A GOS of 1% in Erlang B is 1 blocked in 100 attempts while in in Erlang C it is 1 call delayed for more than say 3 seconds out of 100 attempts.

#33319 Reply
Ravindra Mohan Mathur
Guest

Grade of service is the parameter of Switching system. A system can not be loaded according to its capacity so there are intentional blocking of certain numbers of call. Its shows how many calls from a system may fail if tried. Typically if GOS is 0.002 then out of 1000 calls 2 calls may fail or out of 500 call 1 call may fail.

#33320 Reply
satish panicker
Guest

This is a good article but can you tell me if my switch has sufficient capacity and if no calls are failed due to limitation of circuits.What will be the grade of service.

#33321 Reply
Rommel
Guest

If you are saying that you have no blocking at all that would be a grade of service of P0 but there is no such a thing because traffic formulae are derived from probability. a GoS of P0 would be unusable in all calculations.

#33322 Reply
diafari
Guest

I am a student in Master Degree in Telecommunication from Bali.

I have an assignment in terms of delay system. I have to submit it by Wednesday, 21/11/01. In this case I need Erlang C Table.

I really need your favour in sending The Table.

Thanks a lot in advance.

#33323 Reply
Vicenç Ripoll
Guest

At some traffic tables the Grade of Service is expressed like P.01 or B.01L. What does it mean?

#33324 Reply
syi
Guest

P.01 means that 1 call out of 100 will be blocked.

#33325 Reply
Vicenç Ripoll
Guest

OK, syi, but why “P”? What does it mean?

#33326 Reply
bob
Guest

Vicenç Ripoll,
I believe it is as simple as “Probability” 1% probability is p.01

#33327 Reply
andy
Guest

is the blocking factor here refer to trunk sizing rather than subscriber cct?

#33328 Reply
Jose Quintero
Guest

Grade of Service (GoS) is defined as the probability that calls will be blocked while attempting to seize circuits. It is written as P.xx blocking factor or blockage, where xx is the percentage of calls that are blocked for a traffic system. For example, traffic facilities requiring P.01 GoS define a 1 percent probability of callers being blocked to the facilities. A GoS of P.00 is rarely requested and will rarely happen because to be 100 percent sure that there is no blocking, you would have to design a network where the caller to circuit ratio is 1:1. Also, most traffic formulas assume that there are an infinite number of callers.

#33329 Reply
Assaf Peled
Guest

does anyone knows where I can find an excel of GOS matrix,
for up to 1500 trunks?

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