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Future automotive applications, like high-speed control in power train or drive-by-wire systems, demand large bandwidth, deterministic communication behavior, and fault tolerance. FlexRay, a new standard communication system, is ideally suited to safety applications as well as applicable to the role of a central backbone in future ECU network architectures. The FlexRay physical layer specification is kept very generic to provide the network designer with a wide range of possibilities for optimization of the network implementation. Due to the highly transient behavior of the system, the developer of the network physical layer cannot manually predict the behavior of an entire FlexRay topology. To analyze design concepts like topologies, terminations, and ECU architectures much earlier in development phase, simulation is the only choice.