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In telecommunication, a call-second is a unit used to measure communications traffic density, equivalent to one call with a duration of one second.
Traffic is measured independent of users. For example, one user making two 75-second calls is equivalent to two users each making one 75-second call, as each case produces 150 call-seconds of traffic.
A CCS is often used to describe 100 call-seconds, so 3600 call-seconds = 36 CCS = 1 call-hour.
In a communication network, a trunk can carry numerous concurrent calls by means of multiplexing. Hence a particular number of call-seconds can be carried in infinitely many ways as calls are established and cleared over time. For example, one call-hour could be one call for an hour or two calls for half an hour each. Call-seconds give a measure of the average number of concurrent calls.