3Com OfficeConnect 3CDSG8 - Troubleshooting Specific Problems and Password Reset

88 Troubleshooting
Problems Possible Cause Solution
No connection and the
port LED is off
Incorrect Ethernet cable,
e.g., crossed rather than
straight cable, or vice
versa, split pair (incorrect
twisting of pairs)
Fiber optical cable
connection is reversed
Bad cable
Wrong cable type
Check pinout and replace if necessary
Change if necessary. Check Rx and Tx on fiber optic
cable
Replace with a tested cable
Verify that all 10 Mbps connections use a Cat 5 cable
Check the port LED or zoom screen in the NMS
application, and change setting if necessary
Lost Username and/or
Password
Note: By following this procedure you will also erase all the configuration
settings you may have. The username and password are stored in the
configuration file (you cannot see them as the file is not readable). If you
restore your configuration file after having followed the procedure below,
you will reset the username/password back to what it was before.
If you have forgotten the username and/or the password, you can reset these back
to the default values (Username=admin, no password) by entering the safe mode
when the switch is booting up.
When the switch is booting up, immediately after the first message (Booting
…image 0) is displayed, press together the Control, Shift and – keys. If you have
been successful, you will see the output below on the console interface. If you do
not get the Entering safe mode displayed, power cycle the switch and try
again.
Booting ...image 0
Entering safe mode
SRAM testing: Passed
S/W Version: V1.0.0
H/W Version: R01
serial number0001
Default IP address: 169.254.0.1
**Bootup finish**
Entered safe mode
Note The software and hardware versions, serial number and default IP address
on your switch are likely to be different to those shown in the above
example.
You now have access to a limited set of commands that do not require you to login
in to gain access to them.
Enter the command: system restore default
This will delete all the configuration files and return the switch to it’s factory default
state.
The console will display:
>system restore default
*** Restoring to default configuration...
*** Restored to default configuration...
*** Activating new configuration...
Enter the command: exit
This will exit the safe mode and you can now log back into the switch with the
username “admin” and no password.