Pin Number Designations
There are pin number designations for each color in T-568B and T-568A. T-568B T-568A
-------------------------- ------------------------
Pin Color Pin Name Color Pin Name
--- ------------- -------- ------------- --------
1 Orange Stripe Tx+ Green Stripe Rx+
2 Orange Tx- Green Rx-
3 Green Stripe Rx+ Orange Stripe Tx+
4 Blue Not Used Blue Not Used
5 Blue Stripe Not Used Blue Stripe Not Used
6 Green Rx- Orange Tx-
7 Brown Stripe Not Used Brown Stripe Not Used
8 Brown Not Used Brown Not Used
RJ45 Color-Coded Scheme
RJ45 cables have 8 color-coded wires, and the plugs have 8 pins and
conductors. Eight wires are used as 4 pairs, each representing positive
and negative polarity. The most commonly used wiring standard for
100baseT is T-586B stanrard described above. Prior to EIA 568A and 568B
standards, the color-coded scheme was used to wire RJ45 cables. The
table below depicts pin and color schemes used in traditional and
standardized setup.
| Pin | Colored Scheme | T-568B (Common) | T-568A |
| 1 | Blue | Orange Stripe | Green Stripe |
| 2 | Orange | Orange | Green |
| 3 | Black | Green Stripe | Orange Stripe |
| 4 | Red | Blue | Blue |
| 5 | Green | Blue Stripe | Blue Stripe |
| 6 | Yellow | Green | Orange |
| 7 | Brown | Brown Stripe | Brown Stripe |
| 8 | White (or Grey) | Brown | Brown |
