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8 Solving Problems
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MultiModemZBA-V-V92 User Guide
Ö The serial port might be defective. If you have another serial port, install the modem on it,
change the COM port setting in your software, and try again.
Ö The modem might have a problem beyond the scope of this user guide. If you have another
Multi-Tech modem, try swapping modems. If the problem goes away, call Technical Support for
assistance (see Appendix D).
The Modem Cannot Connect When Dialing
There can be several reasons the modem fails to make a connection. Possibilities include
• lack of a physical connection to the telephone line.
• a wrong dial tone.
• a busy signal.
• a wrong number.
• no modem at the other end.
• a faulty modem, computer, or software at the other end.
• incompatibility between modems
• poor line conditions.
You can narrow the list of possibilities by using extended result codes. Extended result codes are
enabled by default. If they have been disabled, include V1X4 in the modem’s initialization string, or in
terminal mode enter ATV1X4 and press ENTER. When you dial again, the modem reports the call’s
progress.
Ö 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 corporate 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).
Ö If the modem reports BUSY, the other number might be busy, in which case you should try again
later, or it might indicate that you have failed to add a 9, prefix to the phone number if you must
dial
9
for an outside line.
If you must dial
9
to get an outside line, the easiest way to dial it automatically is to include it in
the modem’s dial prefix, e.g., ATDT9,. Note the comma, which inserts a pause before the
number is dialed. By inserting 9, into the dial prefix, you do not have to include it in each
directory entry.
To change the dial prefix in Windows HyperTerminal, select Connect from the Call menu, click
Dialing Properties, and type 9 in the local and long distance boxes in How I dial from this
location.