The Modem Dials But Cannot Connect - Multitech MultiModem DID MT5634ZBA-DID User Manual

MultiModemDID User Guide

The Modem Dials But Cannot Connect

There can be several reasons the ZBA 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.
You can narrow the list of possibilities by using extended result codes. Extended result codes are en-
abled 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 tele-
phone installation. To test the building installation, plug a telephone into your modem's tele-
phone 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).
•
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 num-
ber 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 98 HyperTerminal, select Call from the Call menu, click
Dialing Properties, and type 9 in the local and long distance boxes in How I dial from this lo-
cation.
• If the modem reports NO ANSWER , the other system has failed to go off-hook, or you might
have dialed a wrong number. Check the number.
• If the modem reports NO CARRIER , the phone was answered at the other end, but no connec-
tion was made. You might have dialed a wrong number, and a person answered instead of a
computer, or you might have dialed the correct number but the other computer or software was
turned off or faulty. Check the number and try again, or try calling another system to make sure
your modem is working. Also, try calling the number on your telephone. If you hear harsh
sounds, then another modem is answering the call, and the modems might be having problems
negotiating because of modem incompatibilities or line noise. Try connecting at a lower speed.
Chapter 6 - Troubleshooting
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