From Flukes site:
T568A and T568B are the two color codes used for wiring eight-position RJ45 modular plugs.
Both are allowed under the ANSI/TIA-568-C wiring standards. The only difference between the two color codes is that the orange and green pairs are interchanged. T568A wiring pattern is recognized as the preferred wiring pattern for this standard because it provides backward compatibility to both one pair and two pair USOC wiring schemes. The T568B standard matches the older AT&T 258A color code and is/was (?) the most widely used wiring scheme. It is also permitted by the ANSI/TIA-568-C standard, but it provides only a single pair backward compatibility to the USOC wiring scheme. The U.S. Government requires the use of the preferred T568A standard for wiring done under federal contracts.
Really?
Last edited by Derrick; 08/27/16 12:00 AM.
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