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~ (CCS) A unit used (in North America) to quantify the total traffic running in a network. 1 CCS is 100 call-seconds. That means 1 CCS could be 2 calls of 50 seconds duration or 20 calls of 5 seconds duration. ~ Also known the hundred call second ~ 1 CCS = 100sec call    = 100sec x 1 min / 60 sec x 1 hour / 60 min    = 1 / 36 Erlang
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DIFFERENCE BETWEEN ERLANG AND GRADE OF SERVICE Erlang Erlang is the unit of telephone call traffic. It is defined as average number of calls in progress at some time. Erlang equation is mentioned below. Erlang traffic measurements are carried out by wireless network designers to understand the voice traffic patterns in the network. This will help them derive how many lines will be needed between telephone system and PSTN central office(CO) or between the two cellular/wireless networks. Erlang A = C*h/T Where, C is average no. of call arrived during time interval T h is the average call holding time. In North America CCS(Call Seconds per hour) is used in place of Erlang. 1 Erlang = 36 CCS. Erlang Traffic models Following section mentions difference between Erlang B, Extended Erlang B and Erlang C. • Erlang B: It is used to derive number of lines needed when traffic in erlangs during busy hour is known. This traffic model is mostly used. It assumes that blocked calls are c...
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