There are two basic cable pin outs. A straight through cable, which is used to connect to a hub or switch, and a cross over cable used to operate in a peer-to-peer fashion without a hub/switch.
Generally all fixed wiring should be run as straight through. Some Ethernet interfaces can cross and un-cross a cable automatically as needed, a handy feature. The cross over cable layout is suitable for 1000Base-T operation, all 4 pairs are crossed.
Ethenet RJ-45 Male Connector
Ethernet Cross Over Cable Pinout
|
Name |
Color on NIC1 |
NIC1 |
NIC2 |
Name |
|---|---|---|---|---|
|
TX+ |
White/Orange |
1 |
3 |
RX+ |
|
TX- |
Orange |
2 |
6 |
RX- |
|
RX+ |
White/Green |
3 |
1 |
TX+ |
|
- |
Blue |
4 |
7 |
- |
|
- |
White/Blue |
5 |
8 |
- |
|
RX- |
Green |
6 |
2 |
TX- |
|
- |
White/Brown |
7 |
4 |
- |
|
- |
Brown |
8 |
5 |
- |
For a full description of what an Ethernet cross over cable is and why they are used, read What is an Ethernet crossover cable?
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This data was contributed by the team at The Hardware Book.
