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Appendix B: Cables and Pinouts
Twisted-Pair Cable Assignments
For 10/100BASE-TX connections, a twisted-pair cable must have two pairs of wires.
Each wire pair is identified by two different colors. For example, one wire might be
green and the other, green with white stripes. Also, an RJ-45 connector must be
attached to both ends of the cable.
Caution:
Each wire pair must be attached to the RJ-45 connectors in a specific
orientation. (See “Straight-Through Wiring” on page B-2 and “Crossover
Wiring” on page B-3 for an explanation.)
Caution:
DO NOT plug a phone jack connector into the RJ-45 port. Use only
twisted-pair cables with RJ-45 connectors that conform with FCC standards.
The following figure illustrates how the pins on the RJ-45 connector are numbered.
Be sure to hold the connectors in the same orientation when attaching the wires to
the pins.
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.
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