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Architectures of embedded avionics networks, such as that of the future Airbus A380, currently know important evolutions. This is principally due to the increase in the complexity of the embedded systems, in terms of the rise in the number of integrated functions and their connectivity. The evolution in the technologies of data transmission local area networks makes it possible to convey new answers to airframe manufacturers. In particular, switched Ethernet technologies are being implemented as an avionics architecture, even if the non-deterministic character of certain networks must be compensated by strong assumptions. The paper presents a simulation model for dimensioning an avionics full duplex switched Ethernet network (AFDX) and for studying the performance of this network. Comparison with other deterministic studies which use network calculus is also performed.