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PORTABLE USB MODEM
• Try resetting your modem by unplugging the USB cable from the modem, and
then plugging it back in.
• Try rebooting the computer.
• The modem might be defective. If you have another Portable USB Modem, try
swapping modems. If the problem goes away, the first modem is possibly
defective. Call Tech Support for assistance.
6.3 The Modem Dials But Cannot Connect
There can be several reasons that the modem fails to make a connection.
Possibilities include:
• lack of a physical connection to the telephone line.
• incompatibility between modems.
• a busy signal.
• a wrong number.
• no modem at the other end.
• a faulty modem, computer, or software at the other end.
You can narrow the list of possibilities by using extended result codes. Extended
result codes are enabled by default. If they have been disabled, enter ATV1X4 and
press ENTER while in terminal mode, or include V1X4 in the modem’s
initialization string. When you dial again, the modem will report the call’s
progress.
• If the modem reports NO DIALTONE, check that the modem’s telephone line
cable is connected to both the modem’s LINE jack (not the PHONE jack) and
the telephone wall jack. If the cable looks secure, try replacing it. If that
doesn’t work, the problem might be in your building’s telephone installation.
To test the building installation, plug a telephone into your modem’s
telephone wall jack and listen for a dial tone. If you hear a dial tone, your
modem might be installed behind a company phone system (PBX) with an
internal dial tone that sounds different from the normal dial tone. In that case,
the modem might not recognize the dial tone and might treat it as an error.
Check your PBX manual to see if you can change the internal dial tone; if you
can’t, change your modem’s initialization string to replace X4 with X3, which
will cause the modem to ignore dial tones (note, however, that X3 is not
allowed in some countries, such as France and Spain).