CABLES
1000BASE-T Pin Assignments
1000BASE-T ports support automatic MDI/MDI-X operation, so you can use straight-through cables for all network connections. In straight-through cable, pins 1-8, at one end of the cable, are connected straight through to pins 1-8 at the other end of the cable.
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).
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.
Pin | MDI Signal Name | MDI-X Signal Name |
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1 | Transmit Data plus (TD1+) | Transmit Data plus (TD2 +) |
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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+) | Transmit Data plus (TD3+) |
| | |
8 | Receive Data minus (RD4-) | Receive Data minus (RD3-) |
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