Cable Types And Specifications - SMC Networks 1255TX-1 - annexe 1 Manual

Cable Types and Specifications

Cable
10BASE-T
100BASE-TX
Twisted-Pair Cable and Pin Assignments
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.
The figure below illustrates how the pings on the RJ-45 connector are numbered. Be sure to hold the connectors
in the same orientation when attaching the wires to the pins.
With 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 tables below are used to represent the polarity of the wires that make up each
wire pair.
RJ-45 Pin Assignments
Cable Types and Specifications
Type
Cat. 3, 4, 5 100-ohm
Cat. 5 100-ohm
Pin
1
2
3
6
Max. Length
UTP100 m (328 ft)
UTP100 m (328 ft)
Assignment*
Tx+
Tx-
Rx+
Rx-
33
Connector
RJ-45
RJ-45