RJ45 connectors often appear in our lives. Have you noticed them carefully? The network cables, routers, and switches used for network connections in our computers are connected and communicated through RJ45 connectors. How many types of RJ45 interfaces do you know? So how much do you know about the types of RJ45 interfaces? Today, I will introduce you to some knowledge about the types of RJ45 interfaces, so that you can have a deeper understanding of RJ45 connectors.

Most RJ connectors are RJ45 connectors, used for Ethernet connections. The 8P8C can connect 4 pairs of twisted pairs, 12mm wide, which is a bit wider than the RJ11 series. RJ45 connectors are sometimes used for telephone or RS232 connections, and some people use them to transmit VGA video signals.

The universal telephone connector belongs to a type of RJ11, originally known as WExW, which was developed by a company in the United States as a generic name for a connector. It was originally named WExW and has a 6-pin appearance. WE6W uses all 6 contacts, while WE2W only uses the middle two pins, and later became one of the RJ series connectors.

RJ11, RJ14, and RJ25 are of the same series, with the same size and width of 9.5mm, but the number of contacts is different. RJ11 only has a middle pair of contacts that can connect a pair of wires, represented as 6P2C (six position, two conductors); RJ14 uses four intermediate contacts and can connect two pairs of wires, denoted as 6P4C; RJ5 uses all six contacts and can connect three pairs of wires, denoted as 6P6C.

Sometimes this type of connector can also be used to provide low-voltage low-power power supplies (AC or DC), commonly used as PIN2 and PIN5 (black and yellow lines). Generally, RJ11 is used as the general term for this 9.5mm series, and RJ11-6P2C, RJ11-6P4C, and RJ11-6P6C are used to distinguish the number of contacts. A connector is also used in telephones to connect phones and handles, called 4P4C (also known as RJ22, and forms a series with RJ9 and RJ10). It has four contacts, 7.5mm wide, and is smaller than RJ11 feet.

There is also an 8P8C connector called RJ61 for connecting twisted pair pairs. Because the two wires in the third and fourth pairs of twisted pairs in this wire sequence are relatively distant from each other, they can cause significant crosstalk and are not suitable for the transmission of high-frequency signals such as Ethernet. There is also an RJ48 connector, also known as 8P8C, that can be used to connect 4 pairs of T1 data links, and each pair of lines can transmit 23 time division multiplexed sessions.