3com 3CRWE776075 User Manual

For complete troubleshooting information please refer to your User's 
Guide or visit 3Com’s World Wide Web site: http://www.3Com.com.

Here are some common problems that can occur.

If you forget the password to the Web interface, you will need to reset 
the switch to factory defaults. See “Restoring the Factory Default 
Settings” on page 29.

There is a problem with this connection. Verify that:

■

The device being connected to is powered on and operating correctly.

■

The cable is connected at both ends.

■

The cable is not damaged.

■

If the connection is to a workstation, that the workstation's network 
interface is installed and configured correctly.

■

The correct category of cable is being used for the required link speed. 
Category 3 cables can be used for 10BASE-T operation only. Category 
5 cable is required for 100BASE-TX or 1000BASE-T. 3Com 
recommends Category 5e or 6 cables for 1000BASE-T operation.

Verify that:

■

The fiber cable is in good condition.

■

The SFP module is correctly inserted.

■

A 3Com

®

 SFP module is being used. Refer to “Using SFP Transceivers” 

on page 31 for details.

■

The equipment at the far end is installed and correctly configured.