What is the reason for T568A and T568B termination?
https://networkengineering.stackexchange.com/questions/37995/what-is-the-reason-for-t568a-and-t568b-termination
WEBJan 12, 2017 · 568A provides backwards compatibility when connecting two phone lines, 568B for only one phone line. 568B also offers a better prevention of cross talk (interference between the cable pairs). You can use either 568A or 568B, but you HAVE to use the prescribed pairings of the pins: 1 paired with 2, 3 with 6, 4 with 5 and 7 with 8!
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