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B-2 © 2003 Foundry Networks, Inc. February 2003
Twisted-Pair Cable and Pin Assignments
&DXWLRQ 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 10BASE-T/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 red and the
other, red with white stripes. Also, an RJ-45 connector must be
attached to both ends of the cable.
&DXWLRQ Each wire pair must be attached to the RJ-45 connectors in
a specific orientation. (See “Cabling Guidelines” on page -1
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.
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 switch base unit support automatic MDI/
MDI-X operation, you can use straight-through cables for all