C
ABLES
B-2
Twisted-Pair Cable and Pin Assignments
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.
For 100BASE-TX/10BASE-T 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 red and the other,
red 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 “Cabling Guidelines” on
page 4-2 for an explanation.)
Figure B-1 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.
10BASE-T/100BASE-TX Pin Assignments
Figure B-1. RJ-45 Connector Pin Numbers
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).
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