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AFDX(Avionics Full Duplex Switched Ethernet) is the high-speed full duplex switched avionic databus, on the basis of the Ethernet technology. AFDX can not only avoid Ethernet conflicts and collisions,but also increase transmission rate with a lower weigh of the databus. The avionics data must be delivered punctualy and reliablely, so it is very essential to validate the real-time performance of AFDX during the design process. Aims to guarantee the lossless service in avionics databus, based on NC(Network Calculus),a smart method has been deduced to assess the transmission performance of different network topologies in different avionics architectures through the simulatin and the mathematical assessment,mainly considering three important parameters(delay,backlog and output flow). The technologies used in this thesis benefit to find problems and faults in the beginning stage of the avionics architecture design in the industrial project, especially, in terms of guarantee the lossless service in avionics databus.Several current methods for calculating delay have been listed here, and using some simulation exemples illustrates the way to apply it in conceret scenario.