Tx Baseband Processing; Figure 3-4. Dmd2050E Universal Satellite Modem Functional Block Diagram - Comtech EF Data DMD-2050E Installation And Operation Manual

DMD2050E Universal Satellite Modem

Figure 3-4. DMD2050E Universal Satellite Modem Functional Block Diagram

3.2.3

Tx Baseband Processing

The Tx Data and Clock enters the Baseband Processor, passes through a Rate Adapting FIFO
and enters the Framer/Drop Processor. In Closed-Net Mode, the data passes through the framer
unaltered. In IDR, IBS, and D&I Modes, the framer adds the appropriate framing and ESC as
defined in IESS-308 and 309. In D&I Mode, the framer acquires the terrestrial framing structure,
E1 or T1, and synchronizes the Drop Processor. The Drop Processor extracts the desired time
slots from the terrestrial data stream and feeds these channels back to the framer. The framer
then places the 'dropped' terrestrial time slots into the desired satellite channel slots. The data is
then sent to the Reed-Solomon Encoder.
MN-DMD2050E Revision 2
Theory of Operation
3–6