The advent of high speed networks such as ATM networks has led to an important role for simulation, since exact analysis is difficult in most cases. This paper describes a modular approach in the modeling and simulation of ATM networks and with other networks such as FDDI networks. The OPNET graphics simulation tool is used as the underlying platform of the ATM simulator. The various protocol layers of the ATM network and any control functions that need to be studied are simulated in well defined modules. The main benefit of this approach is that performance issues can be studied independently, and a large number of scenarios constructed and analyzed easily. The detailed simulation model for an ATM network using OPNET is presented, together with a brief/summary of some initial results.
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