Connecting a utp segment to fe-100tx – Cabletron Systems ELS10-26TX User Manual
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Connecting a UTP Segment to FE-100TX
An FE-100TX is often used to provide a connection between the
ELS10-26 and a bridge, router, or switch. Often in this
configuration a “straight-through” cable is used and the FEPIM
crossover switch is set to “not crossed over.”
Normally, when connecting devices to like devices, crossing over
of the transmit and receive pairs must occur. Check each end of
the segment to determine if the wires have been crossed over.
Refer to the schematic of a crossover cable shown on page 4. If
the wires do not cross over, use the switch on the FE-100TX to
internally cross over the RJ45 port.
Connect an FE-100TX to a twisted pair segment as follows:
1. Ensure that the device at the other end of the segment is
connected to the segment and is powered ON.
2. Connect the twisted pair segment to the module by inserting
the RJ45 connector into the RJ45 port on the module. Verify
the Link by checking that the port
LINK
LED is on (solid green).
If the
LINK
LED is off, perform the following steps until it is on:
a. Check that the cable is properly connected at both ends.
b. Confirm that the crossover switch is in the correct position.
c. Check that the 100BASE-TX device at the other end of the
twisted pair segment is powered up.
d. Verify that the RJ45 connector on the twisted pair segment
has the proper pinouts.
e. Check the cable for continuity.
f. Make sure that the twisted pair connection meets dB loss
and cable specifications.
g. Confirm that the devices on each end of the link are using
the correct speed (use the LCM
status
command to check
the actual operating speed and use the
speed
command to
display the configured speed of the port.)
If a Link is not established, contact Cabletron Systems Global Call
Center. Refer to the
Getting Help
section of this guide for details.
Position X
(crossed over)
1. RX+
2. RX-
3. TX+
4. NC
5. NC
6. TX-
7. NC
8. NC
FE-100TX
10
166505
100
x
=
Position =
(not crossed over)
1. TX+
2. TX-
3. RX+
4. NC
5. NC
6. RX-
7. NC
8. NC