The capabilities of the cyclic reservation multiple access (CRMA) protocol for supporting mixed video and data traffic was evaluated by computer simulation. The results show that in order to obtain good performance and fairness between all the mixed stations, they should have similar requirements in terms of the number of slots that are requested at each reservation cycle. It is therefore important to reduce the variability by aggregating more slots for stations with short packets, and by transmitting long frames in successive cycles for long packets. The optimal selection of the low and high bound on the number of slots can significantly improve the performance of the CRMA network under mixed traffic conditions.>

The loss performance is studied of an ATM (asynchronous transfer mode) multiplexer, whose input consists of the superposition of a multiplicity of homogeneous ON-OFF sources. The approach is based on the approximation of the actual input process by means of a suitably chosen two-state Markov modulated Poisson process (MMPP), as a simple and effective choice for the representation of the superimposed arrival streams. To accurately evaluate the cell loss performance, a matching procedure was developed which allows the derivation of a tight upper bound on the cell loss probability and the characterization of its asymptotic behavior as the buffer size increases. Moreover, this procedure yields insight into the multiplexer performance behavior, as the buffer size and the source parameters are varied, and clarifies the modeling limits implied by the choice of an approximating MMPP with only two states.>

The performance of an asynchronous transfer mode (ATM) multiplexer whose input consists of the superposition of a multiplicity of homogeneous on-off sources modeled by a two-state Markovian process is studied. The approach is based on the approximation of the actual input process by means of a suitably chosen two-state Markov modulated Poisson process (MMPP), as a simple and effective choice for the representation of superposition arrival streams. To evaluate the cell loss performance, a new matching procedure that leads to accurate results compared to simulation is developed. The application limits of the proposed method are also discussed. The outstanding physical meaning of this procedure permits a deep insight into the multiplexer performance behavior as the source parameters and the multiplexer buffer size are varied.>

An access protocol suitable for asynchronous transfer mode (ATM) operation in an integrated service broadband metropolitan area network (MAN) is presented. This protocol is designed for a twin-bus optical network and is characterized by a fully distributed control mechanism. A detailed description of the MAC procedure and the results of its performance evaluation are given. In particular, the high fairness degree and the very high throughput values that are the distinctive features of this protocol are highlighted and compared with those relevant to the current version of the IEEE standard 802.6.>