Troubleshooting chart
The following table lists symptoms, possible causes, and possible solutions for problems
that might occur.
Table 3. Troubleshooting chart
Possible SolutionPossible CauseSymptom
•
Check the power cable connections at the
switch and the power source.
•
Make sure that all cables are used correctly
and comply with the Ethernet
specifications.
Power is not supplied to the switch.The Power LED is off.
•
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.
•
Make sure that all cables are used correctly
and comply with the Ethernet
specifications.
•
Check for a defective port, cable, or
module by testing them in an alternate
environment where all products are
functioning.
The port connection is not working.The left LED for a port is off
although the port is
connected to a powered-on
device.
Break the loop by making sure that only one
path exists from any networked device to any
other networked device. After you connect
to the switch local browser interface, you can
configure the Spanning Tree Protocol (STP)
to prevent network loops.
One possible cause is that a
broadcast storm occurred and that
a network loop (redundant path)
was created.
A file transfer is slow or
performance is degraded.
•
Verify that the cabling is correct.
•
Make sure that all connectors are securely
positioned in the required ports. It is
possible that equipment was accidentally
disconnected.
One or more devices are not
properly connected, or the cabling
does not meet Ethernet guidelines.
A segment or device is not
recognized as part of the
network.
Break the loop by making sure that only one
path exists from any networked device to any
other networked device. After you connect
to the switch local browser interface, you can
configure the Spanning Tree Protocol (STP)
to prevent network loops.
A network loop (redundant path)
was created.
The left LEDs for all
connected ports are blinking
continuously and the network
is disabled.
Hardware Installation Guide28Troubleshooting
8-Port Easy Mount Gigabit Ethernet PoE+ Smart Managed Plus Switch GS408EPP
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