Erlang
- An Erlang is a unit of telecommucications traffic measurement.
- An Erlang is defined as the average number of simultaneous calls on a system during one- hour period.
- Erlang defined as the traffic carried by a group of trunks
- In honor of Agner Krarup Erlang
What is Erlang?
- Erlang = 1 call hour / hour
- 1 Erlang = 1 hour ( 60 minutes) of traffic
- Erlang = (calls/busy hour) x holding time
Tips: units must be the same !
Erlang Example Question
A subscriber makes 3 phone calls of
3 minutes, 4 minutes , and 2 minutes duration in 1 hours period. Calculate
Minutes of traffic in the hour =
number of calls x duration
Minutes of traffic in the hour =
(4min+3min+2min)
Hours of traffic in the hour = 9 minutes / 60 minutes
Hours of traffic in the hour = 0.15
Traffic of traffic in the hour = 0.15 Erlang
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