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Your modem is designed to provide years of ultra high speed satisfaction. In the unlikely
event of you encountering problems using your modem, the tips in this section will help
you to identify and resolve them. Most modem problems are a result of incorrect cabling
or settings within your communications or fax software. This section provides a list of
more common problems that you may encounter, followed by likely solutions.
15.1 AT Command Set Problems
Problem
Your modem does not respond to
Solutions
1. Make sure the DTR LED is ON. If it is OFF, make sure your communications
software is using the same COM port as your modem.
2. Check to see that your modem's COM port is not already assigned to another
installed serial device, such as a mouse or laser printer.
Problem
Your modem fails to execute
Solutions
1. Make sure the DTR LED is ON. If it is OFF, make sure your communications
software is using the same COM port as your modem.
Troubleshooting
AT
commands.
AT
commands.
U-90E Data/Fax Modem
Chapter 15
Troubleshooting
15-1
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