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EIA/TIA 568A and 568B UTP Jack Pin Assignment Confusion
Last updated: 10/15/01

Q.  Is the cable labeled 568B on your page LETS MAKE IT SIMPLE in your HOW TO MAKE YOUR OWN CAT 5 TWISTED-PAIR NETWORK CABLES article ACTUALLY wired to 568A?  I have several manufactured cables that have  568A on the label and when I look at the wiring layout it looks like the one you have labeled  568B.

A.  Your message is not the first I've seen questioning the EIA/TIA 568A and 568B UTP Jack Pin Assignments and Color Codes for the 568A and 568B plugs and jacks in that article.  The diagrams in the article are correct.  I have verified them quite a few times. You will see them on the Internet the way I have them and you will see them on some web sites where they are the opposite, incorrect.  I have also seen commercially made cables that were labeled incorrectly.  I believe the problem stems from the fact that the old ATA&T 258A color code is the same as the 568B standard.

"ANSI/TIA/EIA 568
COMMERCIAL BUILDING TELECOMMUNICATIONS
CABLING STANDARD"

...

"TIA/EIA 568 EIGHT-POSITION JACK PIN/PAIR ASSIGNMENTS
 

TIA/EIA T568A


TIA/EIA T568B

"

Also see The Difference Between the T568A and T568B Wiring Standards.

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