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Introduction to Wireless Systems by Frederick C. Berry, David R. Voltmer, Bruce A. Ferguson, Philip S. DiPiazza, Bruce A. Black

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Appendix B. Traffic Engineering

Grade of Service and the State of the Switch

Consider a telephone switch that shares K trunks among a large community of users. From time to time, a call from one of the users arrives at the switch, and the switch removes a trunk from the trunk pool and assigns the trunk to the user. From time to time, a call in progress terminates. When this happens the trunk associated with that call is released and is returned to the pool. We can define the state of the switch as the number k of calls in progress at any given moment. Figure B.1 suggests the way the state might vary with time as calls arrive and terminate.

The State of the Switch

Figure B.1. The ...

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