Troubleshooting Testing the Modem/ - 32
A good test to see if the phone line is working is to type “ATDT”,
which will open the phone line. If the modem reports "NO DIAL-
TONE", there isn't a valid analog line connected. If the phone line
works, you will hear a dial tone until you press the Return key, at
which time the modem will report “NO CARRIER”. A No Carrier
message means the phone line was successfully opened.
Other things that can be done here are:
• Call another modem to verify connections
• Call a working phone number to see if you can successful
connect to an outside line
• Use the ATI1-9 commands to check firmware versions and
modem features
• Use ATZ to reset the modem back to its original configuration
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