Ethernet pinouts
Pinouts for ethernet cables and jacks.
See the Wikipedia article about EIA-568 cables.
The following is from the Datacom Cabling FAQ.
Subject: 10.0 Birds and Bees (Plugs vs. Jacks)
The EIA/TIA specifies an RJ-45 (ISO 8877) connector for Unshielded
Twisted Pair (UTP) cable. The plug is the male component crimped
on the end of the cable while the jack is the female component in
a wall plate or patch panel, etc. Here is the pin numbering to
answer the question, where is pin one?
Plug Jack
(Looking at connector (Looking at cavity
end with the cable in the wall)
running away from you)
---------- / ----------
| 87654321 | | 12345678 |
|__ __|/ |/_ /_|
|____| |/___|
Subject: 12.0 Ethernet 10Base-T Cabling
12.1 Ethernet 10Base-T Straight Thru patch cord (T568B colors);
RJ45 Plug RJ45 Plug
========= =========
/--T2 1 ... White/Orange .... 1 TxData +
pair2 \--R2 2 ... Orange .......... 2 TxData -
/----------T3 3 ... White/Green ..... 3 RecvData +
/ R1 4 Blue 4
\ pair3 T1 5 White/Blue 5
\----------R3 6 ... Green ........... 6 RecvData -
T4 7 White/Brown 7
R4 8 Brown 8
12.2 Ethernet 10Base-T Crossover patch cord;
Note pin numbering in item 10.0 above.
RJ45 Plug RJ45 Plug
========= =========
T2 1 ... White/Orange .... 3 RecvData +
R2 2 ... Orange .......... 6 RecvData -
T3 3 ... White/Green ..... 1 TxData +
R1 4 ... Blue ............ 4
T1 5 ... White/Blue ...... 5
R3 6 ... Green ........... 2 TxData -
T1 7 ... White/Brown ..... 7
T1 8 ... Brown ........... 8
So the order on the "wrong" side is:
1 ... White/Green
2 ... Green
3 ... White/Orange
4 ... Blue
5 ... White/Blue
6 ... Orange
7 ... White/Brown
8 ... Brown
