In order to analyze a queue using a single channel single phase model, customer arrivals must be independent of one another but the average arrival rate is invariant.

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In a single channel single phase model, the assumption is that the arrival rate is constant and independent of previous arrivals, leading to a Poisson distribution. Therefore, the average arrival rate is invariant (i.e. it does not change over time) but the arrivals must also be independent of one another.

In Order to Analyze a Queue Using a Single Channel