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6
TROUBLESHOOTING THE SYSTEM
This chapter explains how to troubleshoot certain
problems with the SuperStack
®
II Switch 3900 system.
It covers:
■ Getting Additional Help
■ Diagnosing Problems
■ Cleaning Dirty Fiber Optic Ports and Connectors
Getting Additional Help
If you experience system problems that are not
addressed in this chapter, contact 3Com Technical
Support or your service representative. Before you
call, gather the following information and have it
available:
■ System serial number
■ Maintenance agreement or warranty information
and the date of purchase
■ Software revision number
■ Brief description of the problem
You can view some of this information in the
Administration Console. From the top-level menu,
enter system display.
For additional information and phone numbers, see
Appendix C.
Diagnosing Problems
By observing system diagnostics, you can identify and
correct problems that might occur when the system
powers up.
Power Failures
If the system does not respond when you insert the
power cord, see the troubleshooting suggestions in
Table 6-1.
Abnormal LED Activity
The Switch 3900 system contains several status LEDs
that indicate system or port problems. If you see
abnormal LED activity, see the troubleshooting
suggestions in Table 6-2 (for system LEDs) and
Table 6-3 (for port LEDs).