This is the color-code connection standard for an RJ-45 (8 conductor) connector. There are two wiring standards: 568A and 568B. The only difference between the two is that two pairs of colors are swapped. The 568B is an older standard defined by AT&T. All new installations are supposed to use 568A. What really is important is that everything be consistent in all your wiring. Otherwise, you'll get yourself confused. Note that the difference is only in what color is used for what pin, not what signal is on what pin, SO in a patch Cable with both ends pre-wired, it doesn't matter.

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