MITSUBISHI ELECTRONICS AMERICA, INC.
ST200 Series Technical Support Manual
101
January 2000
The purpose of this technical supplement is to provide additional information to the Mitsubishi
MT user for circuit switched data operation. The level of detail addresses typical questions or
problems. This technical information, together with the owner’s manual, is useful for installing
and using the Mobile Terminal (MT) data capability.
The Mitsubishi MT is essentially a digital satellite modem that communicates over a digital RF
path to the Communication Ground Segment (CGS). At the CGS, the digital signal is re-
modulated into a T1 format for interfacing with the Public Switched Telephone Network
(PSTN). Therefore, the MT will connect directly into one of the COM (serial) ports of the Data
Terminal Equipment (DTE).
These components and interfaces are shown below:
Your Mitsubishi MT may be used to place or receive data calls. When receiving a data call, the
MT will produce a data ring (a shorter ring and longer pauses) and indicate “SatData Call” on the
MT handset display. When the user answers the call (either by pressing a key on the handset or
using the AutoAnswer functions), the incoming call will be routed to the DTE port on the MT
Common Transceiver Unit (CTU). Once the call has been connected through the DTE port, the
DTE devices at either end of the link can communicate.
For proper operation, be familiar with all instructions in the MT owners manual, the AT
commands supplement, and this supplement. You must also be familiar with your DTE’s
owner’s manual and all specific communications software manual.
Set-Up
1.
Apply to your MSAT service provider for a data telephone number(s) to receive data calls.
A special data number is not needed to place data calls from your MT, only to receive
them. In addition to your voice telephone number, up to 2 (two) different data telephone
numbers per MT could be issued (depending on maximum intended communication rate).
One number is assigned for receiving 4800bps and 2400bps, another number is assigned
for receiving 2400bps and 1200bps. For more information please consult with your MSAT
service provider.
2.
Program and Commission the MT( if not previously done).
Note: No additional programming is required to utilize the data option.
3.
Connect the Data Interface (D/I) Cable into the DTE port on the CTU and to the COMx
port on your DTE.
