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The table below shows the 10BASE-T/100BASE-TX MDI-X and MDI
port pinouts.
1000BASE-T Pin Assignments
The table below shows the 1000BASE-T MDI and MDI-X port pinouts.
These ports require that all four pairs of wires be connected. Note that for
1000BASE-T operation, all four pairs of wires are used for both transmit
and receive.
Use 100-ohm Category 5 or 5e unshielded twisted-pair (UTP) or shielded
twisted-pair (STP) cable for 1000BASE-T connections. Also be sure that
the length of any twisted-pair connection does not exceed 100 meters (328
feet).
Pin MDI-X Signal Name MDI Signal Name
1 Receive Data plus (RD+) Transmit Data plus (TD+)
2 Receive Data minus (RD-) Transmit Data minus (TD-)
3 Transmit Data plus (TD+) Receive Data plus (RD+)
6 Transmit Data minus (TD-) Receive Data minus (RD-)
4,5,7,8 Not used at 10/100 Mbps Not used at 10/100 Mbps
Pin MDI Signal Name MDI-X Signal Name
1 Transmit Data plus (TD1+) Transmit Data plus (TD2 +)
2 Receive Data minus (RD1-) Receive Data minus (RD2-)
3 Transmit Data plus (TD2+) Transmit Data plus (TD1+)
4 Transmit Data plus (TD3+) Transmit Data plus (TD4+)
5 Receive Data minus (RD3-) Receive Data minus (RD4-)
6 Receive Data minus (RD2-) Receive Data minus (RD1-)
7 Transmit Data plus (TD4+) Receive Data minus (RD3+)
8 Receive Data minus (RD4-) Receive Data minus (RD3-)
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