Ethernet is an early and widely used local area network. The classification standards are Standard Ethernet (10Mbit/s), Fast Ethernet (100Mbit/s) and Gigabit Ethernet (1000Mbit/s). With the rapid development of Ethernet technology, 10 Gigabit Ethernet has also emerged in the market with its technology supporting 10Gbit/s transmission rate. Ethernet connection ports: The common types of Ethernet interfaces are RJ45, RJ11, SC fiber optic, etc. Among them, RJ45 interface is our common network equipment interface.

RJ45 interface definition and the function of each pin description is shown below, in the Ethernet is used only 1, 2, 3, 6 these four lines, of which 1, 2 this group is responsible for transmitting data (TX +, TX-), while 3, 6 this group is responsible for receiving data (RX +, RX-), the other four lines are spare.