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erlang (Erl)

Erlang is the measure of traffic intensity on connection-oriented data transmission linesor radio links, named after the Danish mathematician Agner Krarup Erlang (1878 to 1929). Erlang, also called traffic unit( TU) and traffic unit, represents the average demand of a switched link on a given route during a given time of day, the busy hour, which is determined empirically.

Communication traffic measurements and their quantification in Erlang are used for capacity planning of data networks. The Erlang is a dimensionless measure (Erl) between 0 and 1 introduced in 1946 by the CCIF, forerunner of the CCITT. The occupancy of a line for one hour is equal to 1 Erlang. 3 minutes of traffic load corresponds to a traffic value of 0.05 Erlang. In contrast, 0.3 Erlang occurs when a line has been used for 18 minutes.

Another traffic load parameter is the Centum Call Second( CCS) unit. There is a direct relationship between the Erlang and the CCS unit. According to this, 1 Erlang is equal to one call hour, 36 Centum Call Seconds (CCS) or 3600 call seconds.

In addition to the Erlang, there is the Erlang B and the Erlang C. The Erlang B can be used to calculate the number of telephone cables required for a given number of call connections. Erlang B refers to a time frame of one hour. And Erlang C is a model with which the probability and the waiting time are calculated, with which a telephone connection is switched.

Englisch: erlang - Erl
Updated at: 01.12.2017
#Words: 233
Links: traffic, connection, data transmission, unit (U), tributary unit (TU)
Translations: DE

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