56CHAPTER 4: PROBLEM SOLVING
If a fan failure warning message is generated:
1Power off the unit.
2Check that the air vents are not obstructed.
3Power 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
1Power cycle the unit. To do this, remove and reconnect the AC mains supply.
2Check the command line interface (display logbuffer command) to determine whether a thermal shutdown has occurred.
3If 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 C.
4Power 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. See “Approved SFP Transceivers” on page 26.
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.
