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Twisted-Pair Cable Assignments
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 port on the access point 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
1
2
3
6
4,5,7,8
Note: The "+" and "-" signs represent the polarity of the wires that make up each wire pair.
Straight-Through Wiring
Because the 10/100 Mbps port on the access point 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 auto‐MDIX operation, you can use
either "straight‐through" or "crossover" cable.
Figure C-2
C-2 Cables and Pin-outs
10/100BASE-TX MDI and MDI-X Port Pinouts
MDI-X Signal Name
Receive Data plus (RD+)
Receive Data minus (RD-)
Transmit Data plus (TD+)
Transmit Data minus (TD-)
Not used
10/100 BASE-TX Straight-through Cable
1
1
2
2
End A
3
3
4
4
5
5
6
6
7
7
8
8
MDI Signal Name
Transmit Data plus (TD+)
Transmit Data minus (TD-)
Receive Data plus (RD+)
Receive Data minus (RD-)
Not used
EIA/TIA 568B RJ-45 Wiring Standard
10/100BASE-TX Straight-through Cable
White/Orange Stripe
Orange
White/Green Stripe
Green
1
1
2
2
End B
3
3
4
4
5
5
6
6
7
7
8
8
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