Chapter 5- Troubleshooting; None Of The Indicators Light; The Modem Does Not Respond To Commands; The Modem Dials But Cannot Connect - Multi-Tech MT9234ZBA User Manual

Chapter 5- Troubleshooting

Your modem was thoroughly tested at the factory before it was shipped. If you are unable to make a
successful connection, or if you experience data loss or garbled characters during your connection, it is
possible that the modem is defective. However, it is more likely that the source of your problem lies
elsewhere. The following symptoms are typical of problems you might encounter:
•
None of the LEDs light when the modem is on.
•

The modem does not respond to commands.

•
The modem dials but is unable to make a connection.
•
The modem disconnects while online.
•
The modem cannot connect when answering.
•
Data is being lost.
•
There are garbage characters on the monitor.
•
The modem doesn't work with Caller ID.
•
Fax and data software can't run at the same time.

None of the Indicators Light

When you plug in the modem, the operating system detects and configures the modem, and the TR LED
should come on.
If the TR LED does not come on, check to see that the driver from the product CD has been installed, refer to
Chapter 2, step 2 – Install the Modem Driver.
The Modem Does Not Respond to Commands
•
Make sure you are issuing the modem commands from data communication software, either
manually in terminal mode or automatically by configuring the software. (You cannot send
commands to the modem from the DOS prompt.)
•
Make sure you are in terminal mode in your data communication program, then type AT and press
E . If you get an OK response from your modem, your connections are good and the problem
NTER
likely is in the connection setup in your communication software.
•
Try resetting your modem by unplugging the USB cable from the modem, and then plugging it back
in.
•
Try rebooting the computer.
•
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, the first modem is possibly
defective. Call Technical Support for assistance.

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 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 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
Multi-Tech Systems, Inc. MT9234ZBA-USB User Guide (S000419B)
Chapter 5 – Troubleshooting
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