MyJBO Computer And Technical Information Central
RJ45

RJ-45 Standard Color Codes

The T-568A and the T-568B are the two color codes used in wiring RJ-45 eight-pins modular plugs.
While the T-568A is the standard for new installations and the T-568B is the alternative, most
off-the-shelf data equipment and cables seem to be wired to the T568B standard.