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T-568A and T-568B are two types of wiring for the connectors on ethernet cables. Both standards work fine, but you can not intermix the two types of connectors on a single cable. You can have mixed cables on a network as long as each individual cable is wired the same on both ends. (Example, one patch cable uses t568a on both ends, a different cable uses t568b on both ends, and a third uses a matching, but different color pinout)

Some cable is labeled 568a or 568b. This means that the 4 twisted pairs (for a total of 8 little cables) inside the jacketed ethernet cable is made for a certain type of connection. For example, cat 6 cable is higher quality, rated for up to 10GB network use. There are more twists per inch of those little wire pairs inside the jacket of the cable to help reduce crosstalk and interference. I have some cat 6 cable labeled 568b, and of the 4 twisted pairs, some have more twists then others. corresponding to what the data pairs are in the cable. I assume this is a cost cutting measure as more twists means more wire inside of those ethernet cables. Better quality cable should have equal amounts of twists per inch so that either 568a or 568b connections can be used without having to worry about what the cable specifies.

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Q: What is the T-568 A AND T-568 A Ethernet wire?
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