A tandem queue model is developed that models the end-to-end delay behavior in networks that employ sliding window flow control. Messages a r r i v i n g to find the window f i l l e d are assumed to be queued outside the network to await t h e i r turn to enter. The model is analyzed using a hierarchical decomposition method; the key step entails incorporating the fact that the interdeparture process is not exponentially distributed. End-toend delay in v i r t u a l c i r c u i t s can then be obtained by modelling a v i r t u a l route as a tandem queue [ I ] using the method of "adjusted rates."
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