Multi-Tech Systems MT5600BA-V92 User Manual
Chapter 7 – Troubleshooting
Multi-Tech Systems, Inc. MT5600BA-V92 User Guide
41
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).
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 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 95 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
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 95 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
.
•
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.
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 com-
puter, 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.
was made. You might have dialed a wrong number, and a person answered instead of a com-
puter, 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 Terminal, select Settings | Modem Commands. To change it
in HyperTerminal, select Connect from the Call menu, click Dialing Properties, check This
location has Call Waiting
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 Terminal, select Settings | Modem Commands. To change it
in HyperTerminal, select Connect from the Call menu, click Dialing Properties, check This
location has Call Waiting
, and select the correct code for your phone service.
•
If you have extension phones on the same line as your modem, you or someone else can
interrupt the connection by picking up another phone. If this is a frequent problem, disconnect the
extension phones before using the modem, or install another phone line especially for the
modem.
interrupt the connection by picking up another phone. If this is a frequent problem, disconnect the
extension phones before using the modem, or install another phone line especially for the
modem.
•
Check for loose connections between the modem and the computer, the telephone jack, and AC
power.
power.
•
You might have had a poor connection because of line conditions or the problem might have
originated on the other end of the line. Try again.
originated on the other end of the line. Try again.
•
If you were online, it might have hung up on you because of lack of activity on your part or
because you exceeded your time limit for the day. Try again.
because you exceeded your time limit for the day. Try again.
The Modem Cannot Connect When Answering
•
The default DTR Control command (&D2) inhibits autoanswer. To enable autoanswer, change
DTR Control to &D0, and make sure &Q0, &Q1, &Q5, or &Q6 is also set. For more information,
see the &D command in the AT Command Reference Guide on the CD shipped with your
modem. For information on changing the modem’s default configuration, see “Step 3: Install and
Configure Your Software” in Chapter 2.
DTR Control to &D0, and make sure &Q0, &Q1, &Q5, or &Q6 is also set. For more information,
see the &D command in the AT Command Reference Guide on the CD shipped with your
modem. For information on changing the modem’s default configuration, see “Step 3: Install and
Configure Your Software” in Chapter 2.
•
Autoanswer might be disabled. Turn on autoanswer in your datacomm program or send the
command ATS0=1 (ATS0=2 if you have Caller ID service) to your modem in terminal mode.
command ATS0=1 (ATS0=2 if you have Caller ID service) to your modem in terminal mode.