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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-X MDI
1
Bi-directional Data Two Plus (BI_D2+) Bi-directional Data One Plus (BI_D1+)
2
Bi-directional Data Two Minus (BI_D2-) Bi-directional Data One Minus (BI_D1-)
3
Bi-directional Data One Plus (BI_D1+) Bi-directional Data Two Plus (BI_D2+)
4
Bi-directional Data Four Plus (BI_D4+)
Bi-directional Data Three Plus (BI_D3+)
5
Bi-directional Data Four Minus (BI_D4-)
Bi-directional Data Three Minus (BI_D3-)
6
Bi-directional Data One Minus (
BI_D1-)
Bi-directional Data Two Minus (BI_D2-)
7
Bi-directional Data One Plus (BI_D3+) Bi-directional Data One Plus (BI_D4+)
8
Bi-directional Data Three Minus (BI_D3-)
Bi-directional Data Four Minus (BI_D4-)