15
Troubleshooting
This appendix contains information that will help you to solve some of the
common problems you might encounter, while using this 56Kbps USB
modem. For further assistance, contact your dealer.
Modem does not respond to AT commands
•
There may be a COM port/IRQ conflict. Reconfigure the modem COM
port address and IRQ line.
•
Make sure that you have set the correct COM port and IRQ in the
communications software.
•
Make sure the system is in Terminal mode of your communications
software.
Modem cannot dial and “NO DIALTONE” message appears on the
monitor
•
Check the phone cord connection. Make sure that the jack on the
modem labeled Line is connected to an analog phone wall jack.
•
The modem cannot recognize the dial tone. This is typical in some
corporate PBXs. Use the ATX1 command in your setup string to enable
Blind Dial.
The modem does not answer an incoming call
•
Auto-answer function is disabled. Enable the function through software
program or by sending the ATS0=1 command to your modem in terminal
mode.
The modem disconnects while online
•
This may be caused by line interference. Retry the connection by dialing
the numbers several times.
•
An incoming call may have broken the connection if the Call-waiting
feature is enabled. Disable Call-waiting and try again.
Garbage characters display on the monitor
•
Set your modem to the same word length, parity, and stop bits as the
remote modem.
•
Make sure that your software and modem are set to the same flow
control setting.
•
The software may not be set for correct terminal emulation.
•
Configure the software to correct type. ANSI terminal emulation is the
most commonly used.
•
Type the AT&F command to load the factory default settings