INPUT AND OUTPUT QUEUING ATM SWITCH WITH BACKPRESSURE MODE AND QUEUE LOSS MODE FOR NONUNIFORM TRAFFIC

An input and output queueing ATM switch model with a backpressure (BP) mode and a queue loss (QL) mode to decrease the system delay and the cell loss probability under nonuniform traffic is proposed. In the pro posed model, the QL mode is adopted if the size of the backpressure ex ceeds the threshold. We consider a synchronous system with Bernoulli a rrivals under hot-spot traffic that consists of a single output port o f higher access rate superimposed on a background uniform traffic. The system delay and cell loss probability are analyzed under hot-spot tr affic. It is shown that the proposed model is useful for nonuniform tr affic. We also evaluate the effects of the threshold of the backpressu re size for adopting the QL mode on the performance, and consider the optimum value of the threshold. (C) 1998 Scripta Technica.