Cabletron Systems 2E43-51, 2E43-51R Chapter 3: Installation, 3-12 2E43-51/2E43-51R Users Guide

Chapter 3: Installation
3-12 2E43-51/2E43-51R User’s Guide
Figure 3-8 FE-100TX Crossover Switch
A schematic of a crossover cable is shown in Figure 3-9. If the wires do
not cross over, use the switch on the FE-100TX to internally cross over
the RJ45 port.
Figure 3-9 Cable Pinouts - RJ45 Crossover Cable
Connect an FE-100TX to a twisted pair segment as follows:
1. Ensure that the device connected to the other end of the segment is
powered on.
2. Connect the twisted pair segment to the module by inserting the RJ45
connector on the twisted pair segment into the RJ45 port on the
module shown in Figure 3-10.
Position X
(crossed over)
1. RX+
2. RX-
3. TX+
4. NC
5. NC
6. TX-
7. NC
8. NC
Position =
(not crossed over)
1. TX+
2. TX-
3. RX+
4. NC
5. NC
6. RX-
7. NC
8. NC
FE-100TX
10
16651_05
100
=
x
TX+
TX–
RX+
RX– 2
1
3
6
TO
10BASE-T Device Port
TX+
TX–
2
1
3
6
NOTE:
RX+/RX– and TX+/TX–
must share a common
color pair.
TO
RJ45 Port
2251-31
RJ45 to RJ45
RX+
RX–