Troubleshooting
1172 1553-KDU 137 365 Uen D 2006-06-16
9.2 Power and Cooling Problems
If the power indicator does not turn on when the power cord is plugged in, there
may be a problem with the DC power circuit, power cord, or internal power
supply. However, if the unit powers off after running for a while, check for loose
power connections, power losses or surges from the DC source, and verify that
the unit’s cooling fans are unobstructed and running prior to shutdown. If the
problem still cannot be isolated, the internal power supply may be defective.
9.3 Installation
Verify that all system components have been properly installed. If one or more
components appear to be malfunctioning (such as the power cord or network
cabling), test them in an alternate environment where all the other components
are functioning properly.
A port status
LED is off
There is no valid
link on the port
• Verify that the ECN330 and attached device are
powered on.
• Be sure the cable is plugged into both the ECN330
and corresponding device.
• If the ECN330 is installed in a rack, check the
connections to the punch-down block and patch
panel.
• Verify that the proper cable type is used and its
length does not exceed specified limits.
• Check the adapter on the attached device and
cable connections for possible defects. Replace the
defective adapter or cable if necessary.
A port status
LED is
flashing red
There is a power
overload or short
circuit on the port
• Remove the connection to the port.
• Check the connection cable and connectors for
defects and possible short circuits. Replace the
network cable if necessary.
• If the network cable is verified to be OK, replace the
EDA device.
Symptom Cause Action
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