Call-second 

Note 1: A call-second is equivalent to 1 call 1 second long.

Note 2: One user making two 75-second calls is equivalent to two users each making one 75-second call. Each case produces 150 call-seconds of traffic.

Note 3: The CCS, equivalent to 100 call-seconds, is often used.

Note 4: 3600 call-seconds = 36 CCS = 1 call-hour.

Note 5: 3600 call-seconds per hour = 36 CCS per hour = 1 call-hour per hour = 1 erlang = 1 traffic unit.

Source: from Federal Standard 1037C and from MIL-STD-188

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