Do-It-Yourself Pinout Designations for T568 Cable Wiring
There are two wiring standards for T568 cables, it called T568A and T568B which differ only in pin assignments. T-568A is supposed to be the standard for new installations, and T-568B is the alternative. The illustration shows the pin number designations for both cables if you need to diy wiring T568 specifically for an RJ45 plug.
