Solving Hardware Problems - 3Com 4500G Series Getting Started Manual

Solving Hardware
Problems
In the rare event of your switch unit experiencing a hardware failure, refer to the
list of suggested solutions below.
A fan failure warning message is received
Your switch has a fan monitoring system that will generate fan failure warning
messages. Fan failure could potentially reduce the lifetime of the switch. The
monitoring system polls the fan status at periodic intervals while the unit is
powered up.
If one fan has failed in the switch, a warning message will be generated in the
following ways:
Unit LED
■
The seven segment display will show a green flashing 'f'.
RMON Trap
■
If configured, an RMON trap is generated and sent to the management
workstation.
Command Line Interface
■
An indication of a general hardware failure is provided through the Top level
menu displayed when logging on to the CLI. For more detailed information
about the failure select the display logbuffer command.
Web interface
■
An indication of fan failure is provided through the Device Summary table for
the specific unit. In addition all Summary tables turn red to indicate the fan
failure.
If a fan failure warning message is generated:
1 Power off the unit.
2 Check that the air vents are not obstructed.
3 Power cycle the unit. To do this, remove and reconnect the AC mains supply. If
another fan failure warning message is generated using the Command Line
Interface or the Web interface, return the unit to 3Com.
Unit fails, no SNMP fan failure message is received
1 Power cycle the unit. To do this, remove and reconnect the AC mains supply.
2 Check the command line interface (display logbuffer command) to
determine whether a thermal shutdown has occurred.
3 If no, return the unit:
If yes, check that:
The air vents are not obstructed.
■
The ambient temperatures and environmental conditions meet those specified
■
in Appendix B.
4 Power cycle the unit. If a further thermal shutdown occurs, and all environmental
conditions are satisfactory, return the unit to 3Com.

Solving Hardware Problems

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