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FAQs and Troubleshooting
General
If you have trouble with the USR4204 first try the following:
Try removing the power and repeating the setup process.
Make sure the correct COM port was selected.
Make sure the modem was setup properly.
Make sure the power supply is plugged in to an operational power outlet, and that
the power supply is also securely plugged into the unit.
Verify all cables and adaptors are correct for the type of ports.
When connected hit ENTER to see if the Main Menu appears on the terminal.
Configuring the USR4204
How to configure flow control in a setup with added ports:
To enable flow control on a slave USR4204, both the slave and the modem need to have
flow control enabled, but the master must have flow control turned OFF. When two or more
slave USR4204s are chained to a single master serial port, enable flow control in the
modem and only the last slave USR4204 in the chain.
Remote Management
Management modem fails to connect to remote modem:
Refer to your modem troubleshooting documentation.
Check modem phone numbers
Modems connect but fail to show USR4204 interface on the management terminal:
Check for carrier detect override (hit ENTER)
Try general USR4204 troubleshooting
Flashing firmware
Possible Causes for firmware flash failure:
Phone line was disconnected. Confirm it is connected and functional, then reconnect
and try firmware flash again.
File was corrupt. Re-download file and try firmware flash again.
Firmware flash continues to fail. Try firmware flash again using previous working
version or original firmware available from usr.com.
Clearing A Forgotten or Disabled Administrator Name and Password
Disconnect the low voltage power supply from the USR4204, connect a straight Ethernet
cable from the USR4204 terminal port to serial port A, and then re-apply power to the
USR4204. The USR4204 will clear the administrator name and password. You may then
connect a terminal to the USR4204 terminal port to enter a new administrator name and
password. User accounts are unaffected.
USR4204 User Guide
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Page 36 of 52
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