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1991-12-30
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Recommendation B.181)
TRAFFIC INTENSITY UNITY
The CCITT,
considering
(a) that in CCITT texts concerning telephone operations and tariffs and in
CCIR texts concerning radiotelephone transmissions (e.g. telephone radio-relay
systems and the maritime mobile service radiotelephony), the quantity "traffic
intensity" is used together with the unit in which it is expressed. With progress
in telecommunications, increasing use will be made of this term and this unit;
(b) that the unit of carried traffic intensity is defined in CCITT
Recommendation E.600,
recommends
(1) that for telecommunications purposes, the unit of carried traffic
intensity should be defined as follows:
Erlang: the unit of carried traffic intensity. The value in erlangs of the
intensity of traffic carried by a pool of resources2) over a given period of time
is equal to the average number of resources simultaneously busy during this
period;
(2) that the erlang should be represented by the symbol E.
Note - The name "erlang" was given to the traffic unit in 1946 by the
CCIF, in honour of the Danish mathematician, A. K. Erlang (1878-1929), who was
the founder of traffic theory in telephony.
1) The text of this Recommendation is analogous to that of Recommendation 665 of the
CCIR.
2) The term "resource" means any entity used for carrying traffic (circuit, switching
equipment, subscriber line, etc.).
Fascicle I.3 - Rec. B.18 PAGE1