Multitech MultiModemISDN MTA128ST-USB, User Manual

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Chapter 5 - Troubleshooting
MTA128ST-USB
MTA128ST-USB receives garbage characters when connected to a 3Com
Impact IQ terminal adapter
Most likely, the Impact IQ has compression turned on. The compression used by the
Impact IQ is incompatible with the compression used by the MTA128ST-USB.
Disconnect the data connection and give the Impact IQ the command AT%CO and then
establish the data connection again. The garbage characters should disappear.
MTA128ST-USB receives garbage characters after receiving several good
characters when connected to a 3Com Sonix adapter
Most likely, the Sonix has compression turned on. The compression used by the Sonix is
incompatible with the compression used by the MTA128ST-USB. Disconnect the data
connection and give the Sonix the command AT”HO (that’s a double quote) and then
establish the data connection again. The garbage characters should disappear.
Each time a 3Com Sonix terminal adapter originates a V.120 call, the
MTA128ST-USB answers the call as a V.110 call
The Sonix sends V.110 information in the SETUP message to the network. Since the
MTA128ST-USB’s default is with Auto Protocol Detection enabled (ATS52=1), it looks at
SETUP information from the Sonix and determines erroneously that it is a V.110 call.
Disable Auto Protocol Detection in the MTA128ST-USB with the command ATS52=0 and
try the connection again.
MTA128ST-USB won’t connect to an ELSA terminal adapter with the V.120
data protocol
Most likely, the ELSA terminal adapter has compression turned on. The compression
used by the ELSA terminal adapter is incompatible with compression used by the
MTA128ST-USB. Give the ELSA the command AT%CO to disable compression and try
again.