An RJ connector, also known as a Registered Jack connector, is a standardized telecommunications connector used for connecting various devices to a network or telephone system. The most common types of RJ connectors are RJ45 and RJ11.
RJ45 connectors are commonly used for Ethernet connections and have eight pins. They are typically used to connect devices such as computers, routers, switches, and modems to a local area network (LAN) or the internet. RJ45 connectors are used with twisted pair cables, such as Cat5e or Cat6, to transmit data signals.
RJ11 connectors, on the other hand, are commonly used for telephone connections and have four or six pins. They are used to connect telephones, fax machines, and other analog devices to a telephone line. RJ11 connectors are used with telephone cables that typically have four or six wires.
It's important to note that RJ connectors are designed to be modular, allowing for easy insertion and removal, and they are often used with modular jacks or sockets.