Difference between revisions of "Ethernet RJ45 Wiring Reference"

Revision as of 21:34, 22 May 2007

TWISTED PAIR ETHERNET WITH RJ-45 CONNECTOR

If you hold the RJ-45 connector facing you (as if you were going to plug it into your mouth) with the lock tab on the top, then the pins are numbered 1 to 8 from left to right. The pin usage is as follows:

       Pin Number              Assignment
       ----------              ----------
       1                       Output Data (+)
       2                       Output Data (-)
       3                       Input Data (+)
       4                       Reserved for Telephone use
       5                       Reserved for Telephone use
       6                       Input Data (-)
       7                       Reserved for Telephone use
       8                       Reserved for Telephone use

CLIP FACING DOWN - This is how I wire the connector on twisted pair ethernet: Three (3) and six (6) must be a twisted pair.

 T568B RJ 45 Std                     Cross Over Cable
 ---------------                     ---------------
 1. White Orange                     1. White Green
 2. Orange                           2. Green
 3. White Green    (twisted pair)    3. White Orange
 4. Blue                             4. White Brown
 5. White Blue                       5. Brown
 6. Green          (twisted pair)    6. Orange
 7. White Brown                      7. Blue
 8. Brown                            8. White Blue