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Installation Guide for the Model FE508 and FE516 Fast Ethernet Hubs
Table 4-1. Troubleshooting
Symptom
No power at hub
In a stack, no power
at hub but Terminator
LED is on
Terminator LED on
a middle hub in a
stack is on
Port connection not
functioning
Port connection not
functioning
4-2
LEDs
Check
Power off
Check the power cord connections and make sure the ends are
properly plugged into the hub and the wall outlet.
Power off
Check the power cord. In a stack, the termination circuitry gets
Terminator on
power from the cascade cable. If one hub in the stack has a faulty
power cord or the cord is unplugged, the Terminator LED remains
on and the remaining hubs in the stack operate normally.
Terminator on
Cascade cable is not connected properly.
Check for proper connection.
Link off or
If the Link LED is not lit on an active port, check the attached
intermittent
device and make sure it is powered on and that there is a proper
connection at that end.
If the Link LED is intermittent, check the port termination at both
the hub and device ends. Check the crimp on the RJ-45
connectors. In a Fast Ethernet environment, the quality of the
crimp on the connector is important. It is also important that only
Category 5 cabling be used and that it is certified for 100 Mbps
operation.
Check that the length of the UTP cable from the hub to the device
does not exceed 328 feet (100 m).
Link off
Make sure the network adapter cards/network interface cards
installed in the PC or workstations are in working condition and
that the unit is turned on. Verify that the network adapter cards are
100 Mbps capable and that the 100 Mbps LED and Link LEDs are
on at the network adapter card in the PC or workstation.
If the Link LED is not lit after cabling has been installed, check for
an incorrect cable, miswired cable pairs, or loose connectors.
Ensure that there is power for both the hub and the connected PC
or workstation Ethernet transceiver.
Troubleshooting
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