Qualcomm GSP-1620 Spécifications Page 32

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GSP-1620 Modem Overview
2-4 80-99240-1 Rev. D
Figure 2-3 depicts a typical use of the GSP-1620 modem for a
SCADA application using asynchronous data.
Figure 2-3 Typical Modem SCADA Application Using Asynchronous Data
For asynchronous data connections, the GSP-1620 modem
can dial or be dialed by a host modem, connecting through the
Globalstar Satellite Communications System and the PSTN.
Modem Application Characteristics
For either packet or asynchronous connections, as shown in
Figure 2-2 and Figure 2-3, modem applications have the
following basic characteristics:
The GSP-1620 modem serves as the DCE (data
communications equipment) at the remote site. It
functions essentially as a 9600 bps full duplex satellite
modem. The modem uses typical Hayes AT commands
(see Chapter 4, AT Commands). Standard RS-232
Satellite
Globalstar
Gateway
Server
GSP-1620
Modem
SCADA Terminal
Control Port
Data Port
DTE
DCE
Tx
Rx
Host
Outdoor Antenna
PSTN
Gateway IWF Modem
Host Modem
Remote
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