- This topic has 124 replies, 1 voice, and was last updated 1 year, 11 months ago by Althaf.
19th June 2001 at 08:29 #33315RaymondGuest
Can anyone define what “grade of service” is?
I think it’s equivalent to the blocking rate but i just want to be sure.
Thanks19th June 2001 at 22:16 #33316Joan NeptuneGuest
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.24th June 2001 at 22:41 #33317StavrosGuest
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 0.00127th July 2001 at 03:50 #33318Aldwin AurelioGuest
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.24th September 2001 at 08:39 #33319Ravindra Mohan MathurGuest
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.7th November 2001 at 16:42 #33320satish panickerGuest
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.7th November 2001 at 20:35 #33321RommelGuest
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.18th November 2001 at 13:45 #33322diafariGuest
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.18th November 2001 at 21:28 #33323Vicenç RipollGuest
At some traffic tables the Grade of Service is expressed like P.01 or B.01L. What does it mean?30th November 2001 at 05:16 #33324syiGuest
P.01 means that 1 call out of 100 will be blocked.1st December 2001 at 21:43 #33325Vicenç RipollGuest
OK, syi, but why “P”? What does it mean?5th December 2001 at 03:35 #33326bobGuest
I believe it is as simple as “Probability” 1% probability is p.0116th March 2002 at 16:02 #33327andyGuest
is the blocking factor here refer to trunk sizing rather than subscriber cct?20th March 2002 at 13:24 #33328Jose QuinteroGuest
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.24th March 2002 at 17:02 #33329Assaf PeledGuest
does anyone knows where I can find an excel of GOS matrix,
for up to 1500 trunks?