3Com 3CRDSF9PWR manual Problem, Troubleshooting, Solutions

D TROUBLESHOOTING

This section describes problems that may arise when installing the and how to resolve these issue. This section includes the following topics:

■ Problem Management — Provides information about problem management.

	■ Troubleshooting Solutions — Provides a list of troubleshooting
	issues and solutions for using the device.
	■ Fail Safe Commands — Provides a way to recover from problems
	with firmware, configuration settings, or a lost user name or
	password.
Problem	Problem management includes isolating problems, quantifying the
Management	problems, and then applying the solution. When a problem is detected,
	the exact nature of the problem must be determined. This includes how
	the problem is detected, and what are the possible causes of the
	problem. With the problem known, the effect of the problem is recorded
	with all known results from the problem. Once the problem is quantified,
	the solution is applied. Solutions are found either in this chapter, or
	through customer support. If no solution is found in this chapter, contact
	Customer Support.
Troubleshooting	Listed below are some possible troubleshooting problems and solutions.
Solutions	These error messages include:
	■ Cannot connect to management using RS-232 serial connection
	■ Cannot connect to switch management using HTTP, SNMP, etc.
	■ Self-test exceeds 20 seconds
	■ No connection is established and the port LED is on
	■ Device is in a reboot loop