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.
10/100BASE-TX MDI and MDI-X Port Pinouts
Pin |
| MDI Signal Name |
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1 | Receive Data plus (RD+) | Transmit Data plus (TD+) |
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2 | Receive Data minus | Transmit Data minus |
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3 | Transmit Data plus (TD+) | Receive Data plus (RD+) |
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6 | Transmit Data minus | Receive Data minus |
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4,5,7,8 | Not used | Not used |
Note: The “+” and
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 10/100 BASE-TX Straight-through Cable
EIA/TIA 568B
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| White/Orange Stripe |
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| Orange |
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| 1 | White/Green Stripe | 1 |
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End A | 2 |
| 2 | End B |
| 3 |
| 3 |
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| 4 |
| 4 |
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| 5 |
| 5 |
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| 6 | Green | 6 |
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| 7 | 7 |
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| 8 |
| 8 |
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