Wiring Standards T568A and T568B

 T568A and T568B

The two common Ethernet wiring standards are T568A and T568B. There are only 4 wires that are changed between the two standards. Wires 1, 2, 3 & 6, wire 1 switches wire 3, and wire 2 switches with wire 6. I teach my students the easiest way to remember which wires change is to add 1 +2 + 3 = 6.

To check if the wires are in the correct order after inserting them into an RJ-45 connector, hold the connector away from you (as though you are ready to plug it into the back of the PC) with the locking tab facing down.

The 568A specification is shown below:

• Pin 1 - Green/White

• Pin 2 - Green

• Pin 3 - Orange/White

• Pin 4 - Blue

• Pin 5 - Blue/White

• Pin 6 - Orange

• Pin 7 - Brown/White

• Pin 8 - Brown

The 568B specification is shown below:

• Pin 1 - Orange/White

• Pin 2 - Orange

• Pin 3 - Green/White

• Pin 4 - Blue

• Pin 5 - Blue/White

• Pin 6 - Green

• Pin 7 - Brown/White

• Pin 8 – Brown