To evaluate the provision of data service support in ATM networks, complex interactions between different protocol layers have to be considered. These interactions are originated by concurrent operation of flow control mechanisms at several layers. In this paper, we propose a new modelling approach for performance evaluation of these kind of systems. The proposal is based on a modular and object-oriented SDL description. Using this approach, a generic ATM network model is described. Finally, a simulation model is built to illustrate its use. The study case shows a comparison between ABR vs. UBR supporting bursty data traffic carried over TCP. Our conclusion is that detailed modelling of all the relevant mechanisms operating at several layers is necessary to significantly evaluate the performance of data service support in ATh4 networks.
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