RJ45 is a network interface standard that means "Registered Jack-45." It is an 8P8C (8-bit 8-contact) modular plug and socket widely used in local area network (LAN) and wide area network (WAN) connections. The RJ45 interface supports a data transmission rate of up to 1Gbps and is compatible with multiple categories of twisted pair cables, such as CAT5e, CAT6, etc.

"RJ" stands for "Registered Jack", a general term for a series of standardized telecommunications network interfaces. "45" is the specific number of the interface standard. This number represents a specific interface version or specification in the registered standard. Therefore, the name RJ45 represents a standardized network interface.

It can reduce electromagnetic interference and signal attenuation by using twisted pair cables (usually CAT5e, CAT6, or higher cables) to ensure stable data transmission. In addition, the RJ45 interface also has the characteristics of easy plugging and unplugging

The RJ45 interface has become a standard configuration for Ethernet connections and is widely used in routers, switches, modems, printers, and various desktop and laptop computers. In addition to traditional wired network connections, the RJ45 interface is also suitable for PoE (Power over Ethernet) technology, which allows power and data to be transmitted simultaneously over the same network cable.

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