T568A and T568B (AT&T 258A) pin layouts

Click here to go back to the list of pinouts


back to the list of pin layouts

Here presented are two pin assignments for 8-position 8-contact (8P8C) jacks, that may be found in premises cabling systems. The only difference between the two is the pairs 2 and 3 positions. T568A and T568B SHALL NOT be used simultaneously in one installation. Note: T568A is default, T568B is optional.

  T568A pin assignment scheme Pin # Conductor Color Code
1 white/green
2 green
3 white/orange
4 blue
5 white/blue
6 orange
7 white/brown
8 brown


T568B pin assignment scheme Pin # Conductor Color Code
1 white/orange
2 orange
3 white/green
4 blue
5 white/blue
6 green
7 white/brown
8 brown
Residential Cabling Guide

Home Cabling Guide

Finally, an instantly downloadable book that saves you thousands in home improvement dollars! Enjoy living in 21st century technology-advanced home while increasing its selling value and competitive advantage on the real estate market. Whether your cabling is for home office or high-tech leisure, you can wire your home yourself or learn "wirish" to speak with your cabling contractors in their language!

Learn more ...

Please rate this page

Rating: Average rating: 4.16831683167 101 Ratings
BadFineGoodVery GoodExcellent