Multi-Tech Systems MTA128NT - Manual (Page 40)

Troubleshooting
MTA128ST/NT 40
The MTA128ST/NT 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/NT. Disconnect the data connection and the 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 answers the call as a
V.110 call.
The Sonix sends V.110 information in the SETUP message to the network. Since the MTA128ST’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 with the
command ATS52=0 and try the connection again.
The MTA128ST/NT 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/NT. Give the ELSA the
command AT%CO to disable compression and try again.
Apple Macintosh Compatibility
The IWay Hopper works with all Macintosh models with a serial port. Some models may require a USB-to-
serial adapter since the MTA128ST/NT is a serial RS-232 device. Scripts are provided for Mac OS 8
through Mac OS X. These scripts also work with Mac OS 7.x with the Apple Internet Connection Kit
installed. (OS 8 and 8.1 have the Apple Internet Connection Kit built-in and Mac OS 8.5 through Mac OS
X have Internet connection capabilities built-in.) If you don’t use the Internet connection abilities provided
by the Mac OS, then you will need to create your own initialization string to suit your needs. Generally,
these initialization strings can be based on the Factory Profile command &Fn to set up the desired
protocol.