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MultiModemISDN User Guide
MTA128ST-USB
Introduction
This chapter describes basic problems you may run into with your MTA128ST-USB and
how to solve them. Your MTA128ST-USB 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 during your connection, it is possible that the MTA128ST-USB is defective.
However, it is more likely that the source of your problem lies elsewhere. Problems you
may encounter include the following:
• None of the LEDs light when the MTA128ST-USB is on.
• The MTA128ST-USB does not respond to commands.
• The MTA128ST-USB dials but cannot make a connection.
• You can place data calls but not voice calls, or vice versa.
• You cannot place two simultaneous data calls.
• The MTA128ST-USB disconnects while online.
• The MTA128ST-USB cannot connect when answering.
• File transfer appears slower than it should be.
• Data is being lost.
• There are garbage characters on the monitor.
If you experience problems, please check the following possibilities before calling Tech
Support (see Chapter 6).
None of the LEDs light when the MTA128ST-USB is on
When you turn on the MTA128ST-USB, the LED indicators on the front panel should
flash briefly as the unit runs a self-test. If the LEDs remain off, the unit probably is not
receiving power.
• Make sure the MTA128ST-USB’s power switch is on, especially if you normally turn
on the unit by turning on a power strip.
• If the power supply is plugged into a power strip, make sure the power strip is
plugged in and its power switch is on.
• Make sure the power supply module is firmly connected to the MTA128ST-USB and
to the wall outlet or power strip.
• If the power strip is on and the MTA128ST-USB is switched on, try moving the unit’s
power supply to another outlet on the power strip.
• Test that the outlet is live by plugging a lamp into it.
• The MTA128ST-USB or power supply may be defective. If you have another Multi-
Tech MTA128ST-USB, try swapping units. If the problem goes away, the first unit or
power supply may be defective. Call Tech Support for assistance.
Caution: Do not under any circumstances replace the power supply module with one
designed for another product, as it may damage the MTA128ST-USB and void your warranty.