Cabletron Systems 6000 - Manual (Page 34)

Chapter 3: Installation
3-8 6E128-26, 6E138-25, 6E129-26 and 6E139-25 User’s Guide
3.6.2 Connecting a UTP Segment to the FE-100TX
An FE-100-TX installed in port 25 and/or 26 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 3-3 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 3-3 to the not crossed over position,
marked with =.
A schematic of a crossover cable is shown in Figure 3-3 . If the wires do
not cross over, use the switch on the FE-100TX to internally cross over
the RJ45 port.
Figure 3-3 shows how to properly set the FE-100TX
crossover switch.
Figure 3-3 FE-100TX Crossover Switch
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 3-3 .
3. Verify that a link exists by checking that the port RX LED is on
(flashing amber, blinking green, or solid green). If the RX LED is off,
perform the following steps until it is on:
NOTE
The FE-100TX supports Category 5 Unshielded Twisted Pair
cable with an impedance between 85 and 111 ohms.
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