User`s guide

Chapter 3: Installation
3-8 6E123-50 and 6E133-49 User’s Guide
5. Verify that a link exists by checking that the port Link LEDs are on
(solid green). If the Link LEDs are off, perform the following steps
until they are on:
a. Verify that the 10BASE-T device at the other end of the twisted
pair segment is ON and connected to the segment.
b. Verify that the RJ21 connectors on the twisted pair segment have
the proper pinouts and check the cable for continuity.
c. Check that the twisted pair connection meets the dB loss and cable
specifications outlined in Chapter 2.
If a link is not established, contact Cabletron Systems Global Call Center.
Refer to Section 1.7 for details.
6. Repeat steps 1 through 4, above, until all connections have been made.
3.5.2 Connecting a Twisted Pair Segment
to the FE-100TX
An FE-100-TX installed in port 5 and/or 6 has an internal crossover
switch. When connecting a workstation, use a straight-through cable and
set the Fast Ethernet Interface Module crossover switch shown in
Figure 3-4 to the crossed over position marked with X. When connecting
networking devices, such as another bridge, repeater, or router, use a
straight-through cable and set the Fast Ethernet Interface Module
crossover switch shown in Figure 3-4 to the straight-through position,
marked with =.
If the wires do not cross over, use the switch on the FE-100TX to
internally cross over the RJ45 port. Figure 3-4 shows how to properly set
the FE-100TX crossover switch.
Figure 3-4 FE-100TX Crossover Switch
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