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C
Cables and Pinouts
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
Crossover Wiring
Because the 10/100 Mbps port on the power injector uses an MDI pin configuration,
you must use "crossover" cable for network connections to PCs, servers or other
end nodes that only have MDI ports. However, if the device to which you are
C-2
10/100BASE-TX MDI-X and MDI Port Pinouts
EIA/TIA 568B RJ-45 Wiring Standard
10/100BASE-TX 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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