Abstract: Due to the high cost of a large ATM network working up to full strength to apply our ideas about network management, i.e., dynamic virtual path (VP) management and fault restoration, we developed a distributed simulation platform for performing our experiments. This platform also had to be capable of other sorts of tests, such as Connection Admission Control (CAC) algorithms, and accounting and charging methods. The platform was posed as very simple, event-oriented and scalable simulation. The main goal was the simulation of a working ATM backbone network with a potentially large number of nodes (hundreds). As research into control algorithms and low-level, or rather cell-level methods, was beyond the scope of this study, was no real traffic of cells. The simulated network behaved like a real network accepting and rejecting calls and could be managed using standard tools, e.g., SNMP ones, or experimental tools using the API node.