RJ45 (Registered Jack 45) is the connector that consists of 8 metal connection point. RJ45 pinout diagram shows the way how that connector provides communication with network devices. RJ45 exists at the end of the ethernet cables that is used for internetwork communication. There are T568A and T568B standards which are used for RJ45 cabling and these standards are known as RJ45 pinout diagram.
RJ45 Pinout For T568A Standard
RJ45 Pinout For T568B Standard
RJ45 Pinout For Crossover Cable