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GS748T Gigabit Smart Switch
Troubleshooting Chart
The following table lists symptoms, causes, and solutions of possible problems.
Symptom Cause Solution
Power LED is off. No power is received. Check the power cord connections and the
connected device. Ensure all cables used are correct
and comply with Ethernet specifications.
Link LED is off or
intermittent.
Port connection is not
working.
Check the crimp on the connectors and make sure
that the plug is properly inserted and locked into the
port at both the switch and the connecting device.
Ensure all cables used are correct and comply with
Ethernet specifications. Check for a defective
computer adapter card, cable, or port by testing them
in an alternate environment where all products are
functioning.
File transfer is slow or
performance degradation
is a problem.
Half-duplex or full-duplex
setting on the switch and
the connected device are
not the same.
Make sure the attached device is set to
auto-negotiate.
A segment or device is
not recognized as part of
the network.
One or more devices are
not properly connected,
or cabling does not meet
Ethernet guidelines.
Verify that the cabling is correct. Ensure all
connectors are securely positioned in the required
ports. Equipment may have been accidentally
disconnected.
ACT LED is flashing
continuously on all
connected ports and the
network is disabled.
A network loop
(redundant path) has
been created.
Break the loop by ensuring that there is only one
path from any networked device to any other
networked device. After you connect to the switch
management interface, you can configure the
Spanning Tree Protocol (STP) to prevent network
loops.
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