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C
Cables and Pinouts
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.
Pin
MDI-X Signal Name
1
Receive Data plus (RD+)
2
Receive Data minus (RD-)
3
Transmit Data plus (TD+)
6
Transmit Data minus (TD-)
4,5,7,8
Not used
Note: The "+" and "-" signs represent the polarity of the wires that make up each wire pair.
Straight-Through Wiring
Because the 10/100 Mbps Input port on the power injector uses an MDI pin
configuration, you must use "straight-through" cable for network connections to hubs
or switches that only have MDI-X ports. However, if the device to which you are
connecting supports automatic MDI/MDI-X operation, you can use either
"straight-through" or "crossover" cable.
End A
C-2
10/100BASE-TX MDI and MDI-X Port Pinouts
EIA/T IA 568B RJ-45 Wiring Standard
10/100BASE-T X Straight-through Cable
White/Orange Stripe
White/Green Stripe
1
2
3
4
White/Blue Stripe
5
6
7
8
White/Brown Stripe
MDI Signal Name
Transmit Data plus (TD+)
Transmit Data minus (TD-)
Receive Data plus (RD+)
Receive Data minus (RD-)
Not used
Orange
Blue
Green
Brown
1
2
End B
3
4
5
6
7
8
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