A. K. Erlang

A. K. Erlang

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Developed in 1917 by A. K. Erlang, an engineer with the Copenhagen Telephone Company, Erlang C is a complex formula that takes into account the total traffic volume of arriving calls in a set period, the average amount of time spent per transaction, the average length of aftercall processing time, and a carefully calculated acceptable service level, usually defined as 80 percent of calls answered within 20 seconds.
The number of voice circuits, grade of service and quantity of traffic in a telephone network is related according to a formula first published by A. K. Erlang in 1917.