T568-A - T568-B Ethernet Wiring Standards

 T568-A vs T568-B

There are only 4 wires that change between the 2 standards. Use this math problem to remember:

1+2+3 = 6. Those are the only 4 wires that change, 1, 2, 3, & 6.

Hold the RJ-45 connector with the end towards you where the cable will be inserted. The locking tab should be facing the floor. 

T568-A begins White Green / Green

T568-B begins White Orange / Orange

With the green, orange, & brown colors, the striped one is before the solid. With the blue colors the solid blue is first.