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By G. Fiche, G. Hebuterne

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The exchange may be complex, as for instance for communications between mobile users involving intelligent networks. However, the principle that leads to definition of the performance parameters remains the same. 3. Communication, transfer phase reference diagram Once the communication has been set-up, the two parties may exchange "useful" information - referred to as information of user level: voice samples, data, images, files, etc. 2. 3. 4. Disengagement reference diagram The last phase is the communication release, also called disengagement.

It then uses several STP); the latter is itself divided into dissociated mode and quasi-associated mode. In dissociated mode, the messages can use a large number of STP and can follow different paths. In quasi-associated mode however, the routing is predetermined with a maximum of two STP. 3. Mobile networks The GSM network (global system for mobile communication) This is the basic mobile telephone network. The functions are the same as before, but this time the subscribers to be connected are "mobile".

Formally, traffic in erlangs is denoted A, and if the number of busy resources is designated as n(t), this gives the following for a period of observation T: TelecommunicationNetworks and Traffic 27 In more concrete terms, if one assumes a sufficient number of resources to carry all the requests presented, and if we call 2, the mean number, constant, of requests per time unit and t , the average occupation time of the resource by each request. K. e system considered to handle the traffic offered to it.

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Communicating Systems & Ntwks. Traffic, Performance by G. Fiche, G. Hebuterne

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