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10/100BASE-TX PIN ASSIGNMENTS
Use unshielded twisted-pair (UTP) or shielded twisted-pair (STP) cable for RJ-45
connections: 100-ohm Category 3 or better cable for 10 Mbps connections, or
100-ohm Category 5 or better cable for 100 Mbps connections. Also be sure
that
the length of any twisted-pair connection does not exceed 100 meters (328 feet).
The RJ-45 Input port on the power injector is wired with MDI pinouts. This means
that you must use crossover cables for connections to PCs or servers, and
straight-through cable for connections to switches or hubs. However, when
connecting to devices that support automatic MDI/MDI-X pinout configuration,
you can use either straight-through or crossover cable.
10/100BASE-TX MDI and MDI-X Port Pinouts
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 Not used
Note: The “+” and “-” signs represent the polarity of the wires that make up each wire pair.