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Fast Ethernet Pin Assignments
FE Switch Module User Guide Page B-3
B.3.2 Crossover Wiring for the 3H02-04
Two Ethernet 100BASE-TX devices can communicate only if the
transmitter on one device is connected to the receiver on the other device.
This reversal, or crossover function, can be implemented either in the
wiring or in the device itself. The 3H02-04 contains an internal port
crossover on the second connection of each port. This means that you can
choose to use either crossover or straight-through cabling.
When connecting two identical twisted-pair ports (i.e., both crossover
ports or both straight-through ports), you must implement a crossover in
the wiring. Refer to the following table for crossover wiring configuration
for the 3H02-04.
*The “+” and “–” signs are used to represent the polarity
of the two wires that make up each wire pair.
Table B-4 RJ45 Crossover Pin Assignments
RJ45 Pin Assignment
*
1 Tx+
2 Tx–
3 Rx+
6 Rx–
Table B-5 Crossover RJ45 Wiring Configuration
Hub (pin number) Device (pin number)
13
26
31
62