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Ethernet Cable Pinouts

Below are shown the pinouts of different ethernet cabling. Ethernet connectors are of type "RJ45"; an eight (8) connector jack. The pins are numbered from one (1) to eight (8), left to right when looking at the top of the connector.

Crossover and Straight Through Pinouts

The table below describes the pinouts of both straight through and crossover Ethernet cables. Keep in mind that pinouts are described for botht the left and right side of the cable.

Straight Through Cabling Pinouts

Left PinLeft SignalRight PinRight Signal
1Tx+1Rc+
2Tx-2Rc-
3Rc+3Tx+
4GND4GND
5GND5GND
6Rc-6Tx-
7GND7GND
8GND8GND

Crossover Cabling Pinouts

Many times this cable type is not needed. Many devices now have intelligent switching to internally switch pins for proper connectivity

Left PinLeft SignalRight PinRight Signal
1Rx+3Tx+
2Rc-6Tx-
3Tx+1Rc+
4GND4GND
5GND5GND
6Tx-2Rc-
7GND7GND
8GND8GND

Ethernet Cabling Colors

 12345678
EIA/TIA 586AW/GG/WW/OBl/WW/BlO/WW/BrBr/W
EIA/TIA 586B
AT&T 258A
W/OO/WW/GBl/WW/BlG/WW/BrBr/W

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