Performance evaluation of an ATM multiplexer.

Abstract

In this thesis, a queuing model for an Asynchronous Transfer Mode (ATM) based Multiplexing node is developed. In this model, it is assumed that no cell queuing is done within the multiplexer for the purpose of transmission at a later time. This introduces higher cell loss but simplifies the multiplexing (switching) algorithm which is key to ATM. This also gives constant cell delays per network node. The total network delay suffered by a cell is the sum of propagation delay, and cell transmission and buffering delay within each node the cell traverses. A closed form analytical solution is derived for the above described model and ATM cell loss probabilities (or cell blocking probabilities) are computed for a multiplexer assuming identical sources at the input. This enables us to estimate the bandwidth gain for various levels of cell loss probabilities. The model is also extended to include non-identical traffic sources and multimedia sources at the input of the multiplexer. The cell loss probabilities are studied for these cases as well. (Abstract shortened by UMI.)