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TIA/EIA 568a and 568b Wiring Color Codes

TIA/EIA-568-B.1-2001 is likely the most commonly used and talked about feature of the specification created in 1988. 568-a is the definition of pin assignments for the the pairs within Category 3 (CAT3), Category 5 (CAT5) and Category 6 (CAT6) unshielded twisted-pair (UTP) cables (eight conductor, 100-ohm balanced twisted pair cabling). The Pin/Pair assignments were named T568A and T568b, both of which define the pinout or specific order the UTP pairs need to be terminated within 8P8C (Eight Position, Eight Conductor) modular connecters, also known as RJ45 connectors.

RJ45 PinoutRJ45 Pinout
Pin #Wire Color
1White/Green
2Green
3White/Orange
4Blue
5White/Blue
6Orange
7White/Brown
8Brown

568-A Color Code

Pin #Wire Color
1White/Orange
2Orange
3White/Green
4Blue
5White/Blue
6Green
7White/Brown
8Brown

568-B Color Code