Facing the trend of automobile development, the requirements for the automobile electronic bus are getting higher and higher, and the automobile bus is required to have higher data transmission capabilities. The system and equipment communicate with lower cost, stronger anti-interference ability, and safer communication. It is best to use the existing mature bus technology. Based on these considerations, Ethernet technology has entered people’s attention. However, traditional Ethernet is mainly used in industrial and consumer fields. The automotive electronic environment is more severe, and the stress conditions and EMC requirements are higher. Therefore, traditional Ethernet technology is not suitable for automobiles. In order to solve these problems, automotive Ethernet came into being, with higher transmission rates (100 Mb/s & 1000 Mb/s), adapting to harsh automotive electronic application environments (temperature, stress, complex electronic environment), and cost more. Low, lighter weight, high reliability, low power consumption, low electromagnetic radiation, meet specific EMC standards.