What is ERLANG ?
Its a dimensionless unit of traffic intensity.
One erlang is the intensity at which one traffic path i.e. one circuit would be continuously occupied.
It is equivalent of one call (including call attempts and holding time) in a specific channel for 3600 seconds in an hour. The 3600 seconds need not be, and generally are not in a contiguous block.
Example :-
Suppose 60 calls happens in one hour, each lasting 5 minutes,
Minutes of traffic in the hour = number of calls x duration = 60 x 5 = 300
Hours of traffic in the hour = 300/60 = 5
Traffic figure = 5 erlangs.
Erlang calculations are further broken down as:
Erlang B -- The most commonly used traffic model. Erlang B is used to work out, how many lines are required if the traffic figure during the busiest hour is known. This model assumes that all blocked calls are cleared immediately.
Extended Erlang B -- Similar to Erlang B, this model can be used to factor in the number of calls that are blocked and immediately tried again.
Erlang C -- This model assumes that all blocked calls are queued in the system until they can be handled. Call centers can use this calculation to determine how many call agents to staff, based on the number of calls per hour, the average duration of class and the amount of time calls are left in the queue.
Network designers use the erlang to understand traffic patterns within a voice network and use the figures to determine how many lines are required between a telephone system and a central office (PSTN exchange lines), or between multiple network locations.
Erlang is named after Danish telephone engineer A. K. Erlang.
Thanks
telecomtigers@gmail.com
http://homepageforu.webs.com/
Its a dimensionless unit of traffic intensity.
One erlang is the intensity at which one traffic path i.e. one circuit would be continuously occupied.
It is equivalent of one call (including call attempts and holding time) in a specific channel for 3600 seconds in an hour. The 3600 seconds need not be, and generally are not in a contiguous block.
Example :-
Suppose 60 calls happens in one hour, each lasting 5 minutes,
Minutes of traffic in the hour = number of calls x duration = 60 x 5 = 300
Hours of traffic in the hour = 300/60 = 5
Traffic figure = 5 erlangs.
Erlang calculations are further broken down as:
Erlang B -- The most commonly used traffic model. Erlang B is used to work out, how many lines are required if the traffic figure during the busiest hour is known. This model assumes that all blocked calls are cleared immediately.
Extended Erlang B -- Similar to Erlang B, this model can be used to factor in the number of calls that are blocked and immediately tried again.
Erlang C -- This model assumes that all blocked calls are queued in the system until they can be handled. Call centers can use this calculation to determine how many call agents to staff, based on the number of calls per hour, the average duration of class and the amount of time calls are left in the queue.
Network designers use the erlang to understand traffic patterns within a voice network and use the figures to determine how many lines are required between a telephone system and a central office (PSTN exchange lines), or between multiple network locations.
Erlang is named after Danish telephone engineer A. K. Erlang.
Thanks
telecomtigers@gmail.com
http://homepageforu.webs.com/
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