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6.
9.6k DATA COMMUNICATIONS
6.1
General
The Inmarsat-B 9.6k DATA services (hereinafter referred to as "9.6k DATA")
enable data communications between (a) a computer (DTE) connected to MES
which supports the 9.6k DATA and (b) a remote computer (ground station) with a
modem, which allows data communications using telephone lines.
Source: Inmarsat - M/B Data Services User's Guide (published by Inmarsat)
your computer
The 9.6k DATA offers the maximum communication speed of 9600 bps in duplex
transmission. As shown in the figure above, there are two links involved between
the two computers. One is the satellite link {from the MES to the LES (ground
station)} and the other the terrestrial link (telephone line from the LES to the
remote modem).
Under the 9.6k DATA, the MES can be used almost like a modem for general use
and controlled with AT commands. In order to ensure the maximum efficiency of
data communications, however, the above two links must be set up properly.
MES
satellite link
end-to-end link
9.6k DATA system configuration
telephone network
remote modem
Ground station
terrestrial link
remote computer
6-1
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