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Troubleshooting: Mini PCI Type 3B Data Fax Modem by 3Com User's Guide
Common Problems and Solutions • How to Properly Uninstall Modem Drivers
Common Problems and Solutions
Message/Symptom
ERROR
Modem Communication Error or
Modem not found.
NO DIAL TONE
DIGITAL LINE ERROR
Can not hear modem or
speaker
Modem does not dial correctly
Modem does not dial
Modem does not fax
Modem does not connect
Modem connects, but
characters are garbled
Modem clicks repeatedly, but no
connection is made
Possible Solution
If you are typing from the command line in terminal mode, try retyping the command.
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Make sure that you issued the correct AT command.
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If fax software is being used, make sure the correct fax class (Class 1) is selected.
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Make sure that you selected the correct COM port in the software setup.
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Make sure that the cable connections are secure. The connection to the phone line could be incomplete
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or the phone cable could be bad.
Make sure that the telephone line being used is not in use by someone else.
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Make sure that a standard analog telephone line is being used. If the connection being attempted is to a
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digital phone system or a private branch exchange (PBX), an error message may result.
Make sure that the phone line is working by connecting a standard telephone and listening for a dial
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tone.
The modem is trying to connect to a digital phone system (see Modem Features), a public branch
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exchange (PBX), or another kind of invalid line. Change lines to connect to a standard analog telephone
line.
Make sure that the modem's speaker is turned on (ATM1).
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Make sure that the computer's speaker is turned on. Refer to the computer's manual for instructions.
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Make sure that the telephone number that you dialed is correct if the dialing directory is being used.
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Make sure that the number that you dialed is correct if you dialed in terminal mode.
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Make sure that you dialed 1 before dialing the number if dialing long distance.
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Make sure that you dialed a prefix (such as 9) if required.
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The other line could be busy or not answering. Make sure it is available to answer before calling.
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If you are dialing internationally, the modem may not recognize the dial tone. Try blind dialing using the
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ATX1 command (see AT Commands) and the telephone number.
If you have Call Waiting, disable it (usually *70).
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Check the phone line and cable connections.
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Make sure that no other phone extension has been picked up on the same line.
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Make sure that you are using a standard analog telephone line. An error could result if you are trying to
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connect to a digital phone system or a private branch exchange (PBX).
Listen for a normal dial tone on the line. If there is no dial tone or the dial tone sounds differently than
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normal, use another telephone line.
Make sure that you selected fax Class 1.
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Make sure that no other communications programs are open.
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If there is no trouble communicating with any modem except on one particular line, the problem may be
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with the modem on the other end.
Disable error correction (see &M0 in AT Commands) and data compression (see &K0 in AT
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Commands) and try again.
Make sure the parity, modem speed, word length, and stop bits match on both sending and receiving
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modems.
Disable error correction (see &M0 in AT Commands) and data compression (see &K0 in AT
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Commands) and try again.
Ordinarily, a DIGITAL LINE ERROR message would appear, but if the current is under 100mA, the
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modem will click repeatedly but a no dial tone message will appear.
The cable may not be seated securely. Check all cable connections.
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