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
   2             Orange              2
   3             White/Green         3
   4             Blue                4
   5             White/Blue          5
   6             Green               6
   7             White/Brown         7
   8             Brown               8