Comtech EF Data DMDVR20 LBST Rev 1.1 - Manual (Page 24)

DMDVR20 LBST Satellite Modem Theory of Operation
TM136 – Rev. 1.1 3-3
The Baseband Printed Circuit Card also contains the Monitor and Control (M&C) Circuitry
responsible for:
ƒ Programmable part setup and initialization
ƒ Continuous control and adjustment of some functions
ƒ Calibration
ƒ Monitoring fault status
ƒ Calculating and displaying measurements
ƒ User monitor and control interface including front panel and remote
ƒ Units configuration and feature set
The M&C System is based on a powerful microprocessor with a large amount of Flash memory.
Several bus architectures are used to interconnect the M&C to all components of the modem.
Communication to the outside world is done via connections to the remote port, terminal port,
Ethernet port, and alarm ports. The M&C runs off of software programmed into its Flash memory.
The memory can be reprogrammed via the Ethernet port to facilitate changes in software.
3.0.3 Enhanced Interface Printed Circuit Card
The normal terrestrial data for the Baseband Processing Card can be re-routed to the enhanced
interface card. The enhanced interface card adds a variety of connections to the modem for
additional applications
3.1 Functional Block Diagram
Figure 3-3 represents the Functional Blocks. The modem is shown in a typical application with
customer data, Tx/Rx RF equipment and an antenna.