Cat 5 Color Code 568b. Eia/tia 568a and eia/tia 568b. There are two popular color coding standards tia/eia 568a and 568b.
Rj45 receptacle wiring for both standards are shown below: The 568a and 568b standards were developed to provide more effective communications for longer distances in a cat5e cable segment than using non standard schemes. Pair 1 is the blue pair on pins 4 & 5, which corresponds to telephone line 1
Following is diagram of 568a and 568b color code standard
Color coding is a pattern that tells you how to place 8 utp wires in rj45 connector to get a working cable. Eia/tia 568a and eia/tia 568b. If not, the structure won’t function as it ought to be. 568a and 568b are color code standards that show which color wire matches up with a specific position on an rj45 connector.