for wiring diagrams above:
1. For patch
cables, 568-B wiring is by far, the most common method.
2. There is no difference in connectivity between 568B and 568A cables. Either
wiring should work fine on any system.
3. For a straight through cable, wire both ends
cable, wire one end 568A
and the other end 568B.
5. Do not confuse pair numbers with pin numbers. A pair
number is used for reference only (eg: 10BaseT Ethernet uses pairs 2 & 3).
The pin numbers indicate actual physical locations on the plug and jack.