Comtech EF Data DM240XR - Manual (Page 22)

DM240XR High-Speed Digital Modulator Theory of Operation
MN-DM240XR– Revision 13 3–2
Figure 3-1. Functional Block Diagram
3.3 DVB-S2-BS-NBC Operation
The DVB-S2-BS-NBC version of the DM240XR complies with the ETSI EN 302 307 V1.1.1
(2004-01) specification for non-backward compatible broadcast services.
A block diagram of the signal flow is shown in Figure 3-2 below.
Terrestrial
Interface
PRBS
Generator
Terrestrial
Buffer
CRC-8
Encoder
Slicer
BCH
Encoder
LDPC
Encoder
Bit
Interleaver
BB
Filter
PL
Framing
DVB
Sync
PLL
IQ
Modulator
Tx Clock
Symbol Clock
Stream
Adaptation
Mapping IF Out
Tx Data
SCT
SCTE
DDS
Figure 3-2. Functional Block Diagram