Cabletron Systems 2H28-08R - Manual (Page 37)

Connecting to the Network
2H28-08R SmartSwitch 2208 User’s Guide 3-11
3.5.2 Connecting a UTP Segment to the FE-100TX
An FE-100TX installed in port 7 and/or 8 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 straight-through position (not
crossed over), marked with =.
Figure 3-7 FE-100TX Crossover Switch
A schematic of a crossover cable is shown in Figure 3-8 . If a cross over is
required, but a crossover cable is not available, use the switch on the
FE-100TX to internally cross over the RJ45 port.
Figure 3-8 Cable Pinouts - RJ45 Crossover Cable
NOTE
To ensure proper operation, use only Category 5 Unshielded
Twisted Pair (UTP) cabling that has an impedance of 85 to
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
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. For example,
the RX+/RX- pair may
use the bw/wb pair, and
the TX+/TX- may use the
ow/wo pair.
TO
RJ45 Port
2251-31
RJ45 to RJ45
RX+
RX–