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.
Above diagram shows both standards color cables connection. The T568 pinout designation can be seen as followed:
T568A
| Pin | Color | Pair, Description |
| 1 | white/green | 3, Receive Data + |
| 2 | green | 3, Receive Data - |
| 3 | white/orange | 2, Tranfer Data + |
| 4 | blue | 1, Unused |
| 5 | white/blue | 1, Unused |
| 6 | orange | 2, Tranfer Data - |
| 7 | white/brown | 4, Unused |
| 8 | brown | 4, Unused |
T568B
| Pin | Color | Pair, Description |
| 1 | white/orange | 2, Tranfer Data + |
| 2 | orange | 2, Tranfer Data - |
| 3 | white/green | 3, Receive Data + |
| 4 | blue | 1, Unused |
| 5 | white/blue | 1, Unused |
| 6 | green | 3, Receive Data - |
| 7 | white/brown | 4, Unused |
| 8 | brown | 4, Unused |
