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