Wiring

Connectors

RJ45 Jack and Plug Pinout.

Ethernet

The TIA/EIA-568-A specifies two wiring standards for a 8-position modular connector such as RJ45. The two wiring standards, T568A and T568B vary only in the arrangement of the colored pairs. We are using T568B.

Straight-Through Cable Pinout for T568B:

RJ45 Pin #       Wire Color      10Base-T Signal     1000Base-T Signal
                   (T568B)      100Base-TX Signal
   1             White/Orange       Transmit+              BI_DA+
   2             Orange             Transmit-              BI_DA-
   3             White/Green        Receive+               BI_DB+
   4             Blue               Unused                 BI_DC+
   5             White/Blue         Unused                 BI_DC-
   6             Green              Receive-               BI_DB-
   7             White/Brown        Unused                 BI_DD+
   8             Brown              Unused                 BI_DD-

Cross Over Cable Pinout (T568B):

RJ45 Pin #       Wire Color       RJ45 Pin #       Wire Color    
 (END 1)                           (END 2)
   1             White/Orange        1          White/Green
   2             Orange              2          Green
   3             White/Green         3          White/Orange
   4             Blue                4          White/Brown
   5             White/Blue          5          Brown
   6             Green               6          Orange
   7             White/Brown         7          Blue
   8             Brown               8          White/Blue