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

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, ensure that the driver has been installed.

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
you get an OK response from your modem, your connections are good and the problem 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.

Modem Dials But Cannot Connect

There can be several reasons the modem fails to make a connection. Possibilities include:
●
Lack of a physical connection to the telephone line.
●
Wrong dial tone
●
Busy signal
●
Wrong number
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Chapter 5 – Troubleshooting
Multi-Tech Systems, Inc. MT9234ZBA-USB User Guide
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