A study on call-level output process of an ATM switch with distorted on/off sources as input

The traffic characteristic of a pure on/off source (constant inter-arrival time within a burst) will get transformed into a distorted on/off source (random inter-cell arrival time) at the output of an ATM switch due to statistical multiplexing. Hence the on/off sources arriving at an intermediate switch in the network can be assumed to be of a distorted type. We study the call-level output process of such a source at an intermediate switching stage. Two approximations for the inter-cell departure time process of a source are proposed as a conditional sum of two components. Of the two components, one remains constant for all the cells during the on period and the other varies from cell to cell during the burst. The accuracy of these approximations is verified by comparing the moments and the 1-slot average correlations of the inter-cell departure time with those obtained from the simulations