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Real time Internet traffic such as Voice over IP (VoIP) is difficult to estimate and simulate. Since the process is non-ergodic the authors must use ensemble averages rather than time averages, and for combinations of sources the simulation time can be excessive. They give some analytical results for Constant Bit Rate (CBR) traffic for the nD/D/1 queue, and for a CBR queue with varying source rates the authors present an expression for the Interval of Significance (IoS). This is the minimum number of time slots necessary to simulate the traffic, important because of the considerable computation time often involved in simulating this queue.
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