RJ45 Port Pinout Circuit

 

RJ45 connector is used for connecting Ethernet port on computer and in Internet system. There are two configuration: straight and cross. This is the figure of the RJ45 connector;

 

Straight RJ45 cables should be used to connect between computer and device such as switch or hub, and cross RJ45 cables should be used in computer-to-computer connection.  Some hub or switch has the capability to detect the cable type and accept both straight and cross RJ45 cables. A straight Ethernet cable has same RJ-45 pin-out configuration at both end of the CAT-5 cable, either by using EIA/TIA-568A standard or EIA/TIA-568B standard.