What is the difference between RJ45 and RJ11?

18/08/2021
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Common crystal heads are RJ45 and RJ11. Their structure and application range are different, and they cannot be mixed. Today I will explain the difference between these two crystal heads.

First of all, let’s take a look at the meaning of these English abbreviations and numbers. The RJ letter represents the Registered Jack, which is a standardized network interface, and the number after it represents the serial number of the interface standard. Several P and C refer to the number of positions grooves and Several metal contacts.

Both RJ45 and RJ11 crystal heads are composed of PVC shell, shrapnel, chip and other parts. The difference between the two structures is the number of grooves and contacts.

There are two common RJ45 crystal heads, 8P8C and 8P4C, while RJ11 crystal heads usually only have 6 grooves and 4 or 2 contacts. RJ45 crystal head is larger than RJ11 crystal head

RJ45 crystal plugs often play the role of data transmission in scenes such as monitoring projects and computer room integrated wiring. It is an indispensable supporting role in Ethernet. It is generally used at both ends of the network cable to connect various network devices, such as computers, Routers, switches, etc. The four-core crystal head used in the telephone line is the RJ11 crystal head, which is similar in appearance to the RJ45 crystal head. It is a connector developed by Western Electronics. RJ11 is not internationally standardized and is often used to connect phones and modems.

Due to the difference in structure and use of RJ45 and RJ11 crystal plugs, the wiring sequence standards for wiring are also different. When the RJ11 crystal plug is used to connect the telephone line, only two wires are needed. When crimping the wires, connect the middle two wires immediately, and there is no requirement for the color and placement order of the wires, as long as the wiring sequence and color at both ends are the same.

There are two wire sequence standards when connecting RJ45 plugs: 568A and 568B. Through the use of different standards, the final network cable produced has two types: straight-through type and cross-type. However, because the new generation of switches, network cards and other equipment have automatic flipping functions, most of the network cable production now uses the 568B solution. RJ45 crystal head and RJ11 crystal head are different in size, wiring standards and application scenarios, and they are not universal.

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