
Theory of Operation DMDVB20 LBST Satellite Modem
3-4 TM138 – Rev. 1.0
Figure 3-3. Satellite Modem Functional Block Diagram
3.1.1 Front Panel
The Front Panel includes a 2 x 16 backlit LCD Display, Indicator LEDs, and a Numeric Keypad
(refer to Section 4.1).
3.1.2 Baseband Processing
The Baseband Processor performs all Modulator functions required for an IBS Framing Unit, and
Reed-Solomon Codec. In addition, the Baseband Processing Section provides for transmit clock
selection and rate adaptation as well as a rate adapter and Plesiochronous/Doppler (PD) Buffer in
the receive direction. A multiplexer is also provided for the SCT Clock Source for Loop Timing
Applications. The transmit and receive paths are configured independently under processor
control.
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