Cabletron Systems 2E48-27R - Manual (Page 35)

Connecting to the Network
2E48-27R/2E49-27R User’s Guide 3-11
An FE-100TX installed in port slot 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 3-7 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 3-7 to the not crossed over position,
marked with =.
Figure 3-7 FE-100TX Crossover Switch
A schematic of a crossover cable is shown in Figure 3-8 . If the wires do
not cross over, use the switch on the FE-100TX to internally cross over
the RJ45 port.
Figure 3-7 shows how to properly set the FE-100TX
crossover switch.
Figure 3-8 Schematic of 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.
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–