Chapter 5 – Troubleshooting
Multi-Tech Systems, Inc. MT9234ZBA-USB User Guide
29
●
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 reports 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 causes 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. Try again later, or it might indicate that you
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, for example,
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.
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.
●
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.
●
Check for loose connections between the modem and the computer and the telephone jack.
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