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Teletraffic engineering, ortelecommunications traffic engineering is the application oftransportation traffic engineering theory totelecommunications. Teletraffic engineers use their knowledge ofstatistics includingqueuing theory, the nature of traffic, their practical models, their measurements andsimulations to make predictions and to plan telecommunication networks such as atelephone network or theInternet. These tools and knowledge help provide reliable service at lower cost.
The field was created by the work ofA. K. Erlang forcircuit-switched networks but is applicable topacket-switched networks, as they both exhibitMarkovian properties, and can hence be modeled by e.g. aPoisson arrival process.
The observation in traffic engineering is that in large systems thelaw of large numbers can be used to make the aggregate properties of a system over a long period of time much more predictable than the behaviour of individual parts of the system.
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