RJ45 Pinout

The basic knowledge about RJ45 pinout is a very important integral part when it comes to a successful RJ45 connector wiring. If you ever take a close look at a RJ45 connector pinout, you will find that the RJ45 jack has 8 pins, which is used for connecting the Ethernet cable to the RJ45 ends with an RJ45 crimper. The ABC of RJ45 pinouts are not rocket science, but if you would like to get the Ethernet connection done properly and quickly, it is a must.

Basics about RJ45 connector

RJ-45 refers to Registered Jack 45. Actually people tend to think that all 8P8C connectors belongs to RJ45, especially nowadays to some extent RJ45 modular connector is always deemed as the standard Ethernet connectors. So what does 8P8C mean? 8P8C is abbreviation for 8 positions 8 conductors, which means RJ45 connector pinout is composed of 8 pins and need 8 small wires to connect with. And the most common Ethernet cable is Cat5 cable or called the Category 5 cable.

Applications of RJ45 Ethernet connector

Currently RJ45 ends are the most popular small connectors in telecommunications, Local Area Network (LAN) and Wide Area Networking (WAN) via Ethernet. This type of registered jack actually is the industry standard connector now. In other words, as long as there are physical network cabling and telephony applications, RJ45 cable connector is one indispensable part and normally you can find it very easily. Certainly the exception is in wireless communication or wireless internet because in these above-mentioned cases Ethernet cable and cat5e connectors are not necessary any more.

Ethernet RJ45 pinout details

Here the introduction of Ethernet RJ45 pinout is based on the standard of TIA/EIA-569-B and 10Base-T and 100Base-TX Ethernet connections.

Pin 1 is for data transmission, which is a positive pin. It matches with the cord colored white with orange stripe.
Pin 2 is for data transmission, which is a negative pin. It matches also with the cord colored orange with white stripe or solid orange.
Pin 3 is for data receipt, which is a positive pin. It matches with the cord in color of white with green stripe.
Pin 4 is not available. But it is still dispatched the wire connection, which is blue with white stripe or solid blue in color.
Pin 5 is not available. But it is still dispatched the wire connection, which is white with blue stripe in color.
Pin 6 is for data receipt, which is a negative pin. It matches with the cord in color of green with white stripe or solid.
Pin 7 is not available. But it needs to connect to wire colored solid brown or, in most cases, white with brown strip.
Pin 8 is not used. The color of its matched wire solid brown or brown with white stripe normally.

Notes about RJ45 pinouts

About the above-mention RJ45 connector pinout, one thing should be clarified is that the rj45 pinouts we are talking about is a male rather than a female rj45 connector, which refers to RJ45 coupler seen on your computers, modem or network interface card and the like.

Please note that the number order of RJ45 pinouts are based on a RJ45 connector which is flat-side down and from left to right from the angle of your standing position. Otherwise, you might get confused by the numbers of the RJ45 pinout.