3-1
v1.0, November 2008
Chapter 3
Troubleshooting
Troubleshooting Chart
The table below lists symptoms, causes, and solutions of possible problems.
Table 3-1. Troubleshooting
Problem
Cause
Solution
Power LED is off.
No power is received
Check the power cord connections for the
switch at the switch and at the connected
device.
Make sure that 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 correctly
inserted and locked into the port at both
the switch and the connecting device.
• Make sure that all cables used are correct
and comply with Ethernet specifications.
See
Appendix A, “Factory Default
Settings and Technical Specifications
.
• Check for a defective adapter card, cable,
or port by testing it in an alternate
environment where all products are
functioning.
File transfer is slow or
performance degradation is a
problem.
Half- or full-duplex setting on
the switch and the connected
device are not the same.
• Make sure that the attached device is set
to auto-negotiation.
• Check the system message log.
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. Be sure
that all connectors are securely positioned
in the required ports. Equipment may have
been accidentally disconnected.
ACT LED flashes 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.