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How much do you know about the RJ45 interface?

by www.fiber-mart.com

Introduction of RJ45 Connector

RJ45 connector is the most common twisted-pair connector for Ethernet cables and networks. “RJ” means “registered jack”, which is a standardized telecommunication network interface for connecting voice and data equipment to a service provided by a local exchange carrier or long distance carrier. The physical connectors that registered jacks use are mainly the modular connector and 50-pin miniature ribbon connector types. RJ45 connector is an 8-position, 8-contact (8P8C) modular plug and jack, which is commonly used to connect computers onto Ethernet-based local area networks (LAN). RJ45 cable plug is usually made of a plastic piece with eight pins on the port. Four of the pins are used for sending and receiving data, and the other four are used for other technologies or power networking devices.

Introduction of RJ45 Connector Color Code


As we all know, there are two wiring schemes: T568A and T568B, which are used to terminate the twisted-pair cable onto the connector interface. Two standards define how the RJ45 pinouts to arrange the individual eight wires when linking RJ45 connector to a cable. These wiring layouts have their own color convention, and following the convention is important to ensure electrical compatibility.

RJ45 Connector VS. RJ11 Connector

Several other types of connectors closely resemble RJ45, and the RJ11 connector used with telephone cables is one of such connectors. The close physical similarity of RJ45 and RJ11 makes it difficult for an untrained eye to tell the two apart. RJ11 connector is a 6P2C (6 position 2 contact) modular connector – only uses six positions rather than eight positions, which make them less popular than RJ45 connectors.

RJ45 and RJ11 are two commonly used jacks, each with their own specific purpose. The biggest difference between them is that they are used for different applications. RJ45 is used in networking, where you connect computers or other network elements to each other. RJ11 is the cable connector that is being used in telephone sets. Aside from the application, another difference is the number of wires in their connectors. If you look closely at both connectors, you would see that there are only four wires inside an RJ11 while there are eight wires inside an RJ45. As a consequence, RJ45 connector is a little bit bigger than RJ11. It is then quite easy to deduce that you cannot plug in an RJ45 connector to a RJ11 slot but the opposite is possible. Although the smaller size of RJ11 makes it easier to be plugged into the RJ45 slot, it is not recommended to do so since this may damage the device that adopts the RJ45 slot. With proper knowledge and training, some people have been able to use RJ45s all over their house instead of RJ11s. At present, RJ45 jacks are usually placed on the wall outlets inside people’s houses to reduce the number of visible wiring when using VoIP handsets that are rapidly gaining popularity.

RJ45 type network interface

10/100 Base TX RJ45 interface is commonly used in Ethernet interface, support for network connection speed of 10Base and 100Base of adaptive common RJ45 connector into two categories: for Ethernet cards, routers and Ethernet interface DTE type, for switches DCE type. DTE can be called data terminal equipment; the DCE can be called data communications equipment. In one sense, the DTE device is called the "active communications equipment DCE device called a" passive communications equipment. When the two types of devices use RJ45 interface communication, you must use a crossover cable. This can be defined from the following types of pin definitions of the RJ45 the DTE and RJ45 DCE type pin.

RJ45 type cable plug

The RJ45 network cable connector also known as crystal head which a total of eight cores made of, widely used in LAN and ADSL broadband Internet connection to the user's cable network equipment which named as CAT cables or twisted-pair. In the specific application, the RJ45-type plugs and cables, there are two connection methods, respectively called T568A line sequence and T568B linear order.


RJ45 connectors are the key part of Ethernet connectivity to transmit voice and data media. They were developed as much smaller and cheaper replacements to the older telephone installation methods of hardwired cords. The easy plug-n-play style reduces the difficulty of installation. Compared with RJ11, RJ45 is suitable for more applications, such as Ethernet networking, telecom

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