Fast Ethernet Switch User Guide

CABLES
Cable Specifications
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 to
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.
Caution: Each wire pair must be attached to the RJ-45 connectors in a
specific orientation.
10BASE-T/100BASE-TX Pin Assignments
With standard straight-through 10BASE-T/100BASE-TX cable, pins 1 and
2 are used for transmitting data, and pins 3 and 6 for receiving data.
The ‘+’ and ‘-‘ signs in the table below are used to represent the polari-
ty of the wires that make up each wire pair.
Because all ports on this switch support automatic MDI/MDI-X opera-
tion, you can use straight-through cables for all network connections to
PCs or servers, or to other switches or hubs.
Cable Types and Specifications
Cable Type Max. Length Connector
10BASE-T Cat. 3, 4, 5 100- 100m (328 ft) RJ-45
ohm UTP
100BASE-TX Cat. 5 100-ohm 100m (328 ft) RJ-45
UTP
Straight-through RJ-45 Pin Assignment
End 1 End 2
1 (Tx +) 1 (Tx+)
2 (Tx -) 2 (Tx -)
3 (Rx+) 3 (Rx+)
6 (Rx-) 6 (Rx-)