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UTP wiring

I’m always confused about which wiring scheme to use for UTP cables. After doing some research, it seems T568B is what you need. Wikipedia says that is doesn’t really matter, but crosstalk can be a problem for T568A in some esoteric situations:

Note that the only difference between T568A and T568B is that pairs 2 and 3 (orange and green) are swapped. Both configurations wire the pins “straight through”, i.e., pins 1 through 8 on one end are connected to pins 1 through 8 on the other end. Also, the same sets of pins are paired in both configurations: pins 1 and 2 form a pair, as do 3 and 6, 4 and 5, and 7 and 8. However the different pairs in an Ethernet cable are identical,[dubious – discuss] so one can use cables wired according to either configuration in the same installation without significant problem; problems involving crosstalk can occur (which is normally minimized by correctly twisting a pair together), but are usually insignificant in all but the most stringent specifications such as Category 6 cable. The primary thing one has to be careful of is not to accidentally wire the ends of the same cable according to different configurations (except if one intends to create an Ethernet crossover cable).


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