Multi-Tech Systems MT4X56USB - Manual (Page 59)

Chapter 6 - Troubleshooting
MT4X56USB 59
• 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
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 phone cable is securely
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 find out, plug a telephone into your modem’s wall jack and
listen for a dial tone. If you hear a one, your modem might be installed behind a company
phone system (PBX) with an internal dial tone that sounds different from the normal one. 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
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 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
location.
• 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
connection 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.
The Modem Disconnects While Online
• If you have Call Waiting on the same phone line as your modem, it can interrupt your
connection when someone tries to call you. If you have Call Waiting, disable it before each
call. In most telephone areas in North America, you can disable Call Waiting by preceding the
telephone number with *70 (check with your local telephone company).
You can automatically disable Call Waiting by including the disabling code in the modem’s
dial prefix (e.g., ATDT*70,—note the comma, which inserts a pause before the number is
dialed). To change the dial prefix in Windows 98 HyperTerminal, select Call from the Call
menu, click Dialing Properties, check This location has Call Waiting, and select the
correct code for your phone service.