There are two standards for CAT5
It seems that 568-B is the most common, but I've always used the 568-A version with success.
Below are two equally valid ways to make a patch cable
If you want to make a straight patch cable use one of the methods for both ends.
If you need a cross-over cable use 568-B for one end and 568-A for the other!
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568-B Wiring
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568-A Wiring
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