There are two accepted standards for 8-wire data network jacks (commonly and incorrectly called "RJ-45.")
ANSI/TIA/EIA-568-B "Commercial Building Telecommunications Cabling Standard" lists both wiring configurations. T568B is the most prevalent for commercial installations, and was used by AT&T for the original Merlin phone systems. To help you remember, associate "B" with "Bell."
ANSI/TIA/EIA-570-B "Residential Telecommunications Cabling Standards" recommends T568A
- If the installation is residential, choose T568A unless other conditions apply (see below). The two inner pairs of 568A are wired the same as a two-line phone jack.
- If there is pre-existing voice/data wiring (remodel, moves, adds, changes), duplicate this wiring scheme on any new connection.
- If project specifications are available, use the specified wiring configuration.
- If components used within the project are internally wired for either T568A or T568B, use that wiring scheme.
- Make sure both ends of a cable are wired the same way.
Jack Wiring
|
Pin # | T568B | T568A |
1 | White/Orange | White/Green |
2 | Orange | Green |
3 | White/Green | White/Orange |
4 | Blue | Blue |
5 | White/Blue | White/Blue |
6 | Green | Orange |
7 | White/Brown | White/Brown |
8 | Brown | Brown
|