On the Emulation of Impairments in ATM-Networks

The core of this thesis consists of the so called "off-line simulation" of network behaviour under different conditions, such as the amount and type of traffic, the size of a network and characteristics of its nodes.

A model of an ATM network is proposed, consisting basically of a cascade of switching nodes and traffic generators. The sequence of nodes defines a specific transmission path within the network. Propagation delay, latency in the nodes and cell losses are described by statistical parameters. A tool has been implemented for the specific simulation of this model. It allows for an efficient conversion of the characteristics of the network into ascertained statistical parameters. The correct implementation of the tool has been proven by using analytical methods and by comparing the results with values published in the literature. Furthermore this book presents a framework for the realisation of a real-time emulation system.

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