User's Manual

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Appendix B: Cables
Twisted-Pair Cable and Pin Assignments
For 10BASE-T and 100BASE-TX connections, the 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: DO NOT plug a phone jack connector into any RJ-45 port. Use only
twisted-pair cables with RJ-45 connectors that conform with FCC standards.
Caution: Each wire pair must be attached to the RJ-45 connectors in a specific
orientation. (See “10BASE-T/100BASE-TX Pin Assignments” on page 113 for
an explanation.)
The figure below 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.
Figure B-1 RJ-45 Connector Pin Numbers
10BASE-T/100BASE-TX Pin Assignments
Use unshielded twisted-pair (UTP) or shielded twisted-pair (STP) cable for RJ-45
connections: 100-ohm Category 3, 4 or 5 cable for 10 Mbps connections, or
100-ohm Category 5 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 ports on the Gateway support automatic MDI/MDI-X operation, so you
can use straight-through cables for all network connections to PCs or gateways. In
straight-through cable, pins 1, 2, 3, and 6, at one end of the cable, are connected
straight through to pins 1, 2, 3, and 6 at the other end of the cable. When using the
RJ-45 port on this Gateway, you can use either straight-through or crossover cable.
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1
1
8