3com 3CRUS2475 Manuale Utente

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

■

Problem Management — Provides information about problem 
management with the devices.

■

Troubleshooting Solutions — Provides a list of troubleshooting 
issues and solutions for using the devices.

Problem management includes isolating and quantifying problems, and 
applying solutions. 

When a problem is detected, the exact nature of the problem must be 
determined. Problem analysis includes how the problem is detected, and 
what are its possible causes. With the problem known, the effects of the 
problem are recorded, including all known results of the problem. Once 
the problem is quantified, theappropriate solution can be applied. 
Solutions to common troubleshooting issues are found either in this 
document, or can be obtained through Customer Support. 

If no solution is found in this document, please contact Customer 
Support for advice and instructions.

Listed below are possible troubleshooting problems and their solutions. 
These error messages include:

■

Cannot connect to management using RS-232 serial connection

■

Cannot connect to switch management using Telnet, HTTP, SNMP, etc.

■

Self-test exceeds 15 seconds.

■

No connection is established and the port LED is on.

■

Device is in a reboot loop