Abstract:The synchronization of deterministic networks is very important in aerospace electronic systems. In order to ensure the normal time synchronization of deterministic network in case of failure, this paper adopts the typical double star topology switching structure in spaceVPX standard to configure a fault-tolerant system based on time triggered Ethernet protocol. Aiming at this architecture, the single fault-tolerant structure in the aerospace system using Ethernet is simulated, and the exceptions of several time synchronization protocol control frames are simulated: the protocol control frame includes cold start frame, cold start response frame The impact of the integrated frame sent from the port of the faulty switch to a terminal system in the network on the synchronization network of the time triggered network. The simulation results show that the fault switch will gradually prolong the start-up time of the terminal system in normal operation, which is not conducive to the whole synchronization process of the network system. However, if the period of different protocol control frames exceeds a certain value, the single point of fault will not affect the start-up time of the dual redundant system.