3-1
v1.0, October 2008
Chapter 3
Troubleshooting
Troubleshooting Chart
The following table lists symptoms, causes, and solutions of possible problems.
Table 3-1. Troubleshooting
Problem
Cause
Solution
Power LED is off.
No power is received
Link LED is off or
intermittent.
Port connection is not
working.
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.
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 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.
• Check the power cord connections for the
switch at the switch and the connected device.
• Make sure that all cables used are correct and
comply with Ethernet specifications.
• 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 used are correct and
comply with Ethernet specifications.
• Check for a defective adapter card, cable, or
port by testing it in an alternate environment
where all products are functioning.
• Make sure that the attached device is set to
auto negotiate.
• Check the system message log