Performance analysis of multiclass traffic in ATM networks

In B-ISDN (broadband integrated services digital network) the ATM (asynchronous transfer mode), which is fixed-length packet transport scheme, is a promising proposal. Since the packet length is fixed, it has the potential to perform various service requests of users. Thus, the authors present a queueing model which has two kinds of user sources, priority source and nonpriority source. Priority cells get superior service to nonpriority cells, because of their delay-critical natures; it is assumed that the arrival of nonpriority cells, including the blocked and retransmitted cells, is a Poisson process. Based on this model, the discard probability of the priority cells and the mean delay time of the nonpriority cells are evaluated, and they are validated by computer simulations. The numerical results show that the performance of nonpriority cells is also highly dependent upon the arrival pattern of priority cells