84 CHAPTER 5: PROBLEM SOLVING
3Power cycle the unit. To do this, remove and reconnect the AC mains
supply. If the unit has no AC main supply, remove and reconnect the DC
RPS supply.
4If another fan failure warning message is generated via 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. If the unit has no AC mains supply, remove and reconnect the DC
RPS 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 on page 127.
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 1000BASE-X SFP Transceivers” on page 47
and “Approved 100BASE-X SFP Transceivers” on page 48.
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.
Solving Communication Problems
If you experience communication problems with the switch, ensure that:
■The switch IP address and management VLAN ID has been configured.
10014925-AD_S5500_GSG.book Page 84 Thursday, August 16, 2007 12:29 PM