3Com 4500G Getting Started Manual page 60

60 C 4: P
HAPTER ROBLEM
S
OLVING
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.
Error message indicating that the SFP transceiver is invalid
The switch has identified that the SFP does not meet the minimum
requirements for the switch and has disabled the port. To correct this
problem, completely remove the SFP and replace it with a 3Com approved
SFP.
Error message indicating that the SFP transceiver is faulty
To correct this problem, completely remove the SFP and then reinsert it.
Alternatively, insert another identical SFP. If the problem persists, contact
3Com Technical Support.