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With the rapid development of aviation technology, avionics electric system has gradually become an indispensable part of the system. Avionics electric system is composed of many separate sub-systems. The amount of data needed to be transmitted between subsystems is growing, and the performance and security requirements of Avionics transmission bus are also increasing. The traditional avionics electric system transmission bus standards ARINC429,ARINC629 and IL-std-1553B cannot meet the requirements of modern avionics system because of the small bandwidth, slow speed and high price. In this case, the AFDX (Avionics Full Duplex Switched Ethernet) network standard arises at the historic moment. AFDX network is based on Ethernet standard. The maximum transmission rate can reach 100 Mb/s. At the same time, full duplex link is used for data transmission, which reduces link conflict. At present, AFDX network has been applied to the latest Airbus Company A380 aircraft. To address the issues of traditional AEST bus standards, we investigate AFDX in this paper by building a AFDX in this paper by building a AFDX network on OPNET. Specifically, in this paper, we explore the AFDX with network layer model, node layer model of avionics end-system and process layer model. And then set up the simulation network and get the end-toend delay and delay jitter in general state of the AFDX network. Furthermore, we build a star network for comparison. We found that the QoS performance of AFDX is butter than general star network.

Modeling and Simulation of Avionics Full Duplex Switched Ethernet(AFDX Network) Based on OPNET