First, RJ45 is 8 pins, 8 pins and 8 slots, commonly known as 8P8C；; RJ 1 1 is 6 small slots or 4 small slots, but sometimes there are 6 pins, 6 pins, and sometimes there are 4 pins, and there are 4 pins or 2 pins in 6 small slots or 4 small slots.

Second, RJ 1 1 usually refers to a 6-position (6-pin) modular jack or plug. There is no international standard for this kind of connector, which is mentioned in the General Integrated Wiring Standard. Moreover, this name is often used for the 4-pin version of modular connectors, which is easy to cause confusion.

RJ45 is an information socket (communication socket) connector in wiring system. The connector consists of a plug (connector, crystal head) and a socket (module). The plug has 8 grooves and 8 contacts. RJ is the abbreviation of Registered Jack, which means "registered socket". RJ is the interface describing public telecommunication network in FCC (Federal Communications Commission Standards and Regulations), and RJ45 of computer network is the common name of standard 8-bit modular interface.

Extended data:

RJ 1 1 has only four pins (RJ45 has eight pins). In computer systems, RJ 1 1 is mainly used to connect modems.

At present, the standard of telephone crystal head is RJ 1 1 interface crystal head, and the general telephone line is quad-core, that is, there are four wires in the telephone line, but actually only two wires are needed, and there is no requirement for the order of wires, so it is not necessary to distinguish the positive and negative electrodes when making, and it can be discharged at will.

RJ45 is usually used for computer network data transmission. There are two types of connectors: linear (12345678 12345678) and cross (12345678/36 145278). There are two different ways to sort RJ45 avatars by lines, one is orange white, orange white, green white, blue, blue white, green, brown white and brown; The other is green white, green, orange white, blue, blue white, orange, brown white and brown.

Therefore, there are two kinds of wires using RJ45 connectors, namely, straight-through wires and staggered wires. RJ45 interface is usually used for data transmission, * * * is composed of eight nuclear, and the most common application is network card interface.

Baidu encyclopedia -RJ 1 1

Baidu Encyclopedia -RJ45