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1000BASE-T Pin Assignments
All 1000BASE-T ports support automatic MDI/MDI-X operation, so you can use
straight-through cables for all network connections to PCs or servers, or to other
switches or hubs.
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, 5e or 6 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).
Table B-2. 1000BASE-T MDI and MDI-X Port Pinouts
Pin MDI Signal Name MDI-X Signal Name
1 Bi-directional Data One Plus
(BI_D1+)
Bi-directional Data Two Plus
(BI_D2+)
2 Bi-directional Data One Minus
(BI_D1-)
Bi-directional Data Two Minus
(BI_D2-)
3 Bi-directional Data Two Plus
(BI_D2+)
Bi-directional Data One Plus
(BI_D1+)
4 Bi-directional Data Three Plus
(BI_D3+)
Bi-directional Data Four Plus
(BI_D4+)
5 Bi-directional Data Three Minus
(BI_D3-)
Bi-directional Data Four Minus
(BI_D4-)
6 Bi-directional Data Two Minus
(BI_D2-)
Bi-directional Data One Minus
(BI_D1-)
7 Bi-directional Data One Plus
(BI_D4+)
Bi-directional Data One Plus
(BI_D3+)
8 Bi-directional Data Four Minus
(BI_D4-)
Bi-directional Data Three Minus
(BI_D3-)