Before you begin, you should know which wiring scheme you will be using. The only difference between 568A and 568B wiring is that pairs 2 and 3 (orange and green) are swapped. If you are unsure which one to use then you should go with the 568B diagram. It is the 568B diagram that we demonstrate in this tutorial and the 568A wiring is shown in the diagrams below mainly for illustration. In our estimation the 568B connection is used in over 99% of all straight through applications. Know that using either the A or B standard will produce a "straight through" connection that should work for any Ethernet or POE (power over Ethernet) application. Therefore do not sweat over the choice.