Ethernet cable is the most commonly used component in home network. It can also be terminated with various RJ connectors, such as RJ45 connector and RJ11 connector. The letter “RJ” stands for the registered jack. It is a standard telecommunication network interface designed by bell system and managed by the Federal Communications Commission (FCC), Used to connect voice and data devices to services or long-distance carriers provided by local switching operators. Because these two connectors have similar appearance, many people often mix them together.

Although RJ45 connector and RJ11 connector have similar appearance, there are still some differences between them

1、 Application of RJ45 connector and RJ11 connector

The biggest difference between RJ45 connector and RJ11 connector is where they are actually used. RJ45 connector is used for network. You can connect computers or other network components to each other. RJ11 is a cable connector for telephone, ADSL and modem cables.

2、 Structure of RJ45 connector and RJ11 connector

RJ45 connector and RJ11 connector in addition to the application, the connector structure is also different, individuals can easily view and identify. If you look closely at the two connectors, you will find that there are only four wires inside RJ11 and eight wires inside RJ45. The RJ45 connector is also a little larger than the RJ11 because it has to accommodate more wires.

3、 Wiring scheme of RJ45 connector and RJ11 connector

Another difference between RJ45 connector and RJ11 connector is their wiring scheme. A typical RJ11 connector has six terminals, usually using only the middle four pins. For example, pots (ordinary old telephone line) usually contains two pairs of wires. They are designed for two independent telephone lines, and the center pin (red and green) contains the first telephone line. The connection mode of the telephone system is also different.

For RJ45 connector, it has two different wiring schemes – t-568a and t-568b. These two routing schemes can be used to create cross or through cables. The crossover cable has a t-568a connector at one end and a t-568b connector at the other end. When no router, hub or switch is available, it is usually used for direct computer to computer connection. The straight through cable has t-568a or t-568b at both ends for connecting different types of equipment.


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