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Theory of Operation
3.2 DVB-S2-BS-NBC Operation
The DVB-S2-BS-NBC version of the DM240 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.
PRBS
Generator
Tx Data
Terrestrial
SCTE
Interface
SCT
DDS
Tx Clock
3-2
Terrestrial
Buffer
Stream
Adaptation
Encoder
Mapping
Framing
PLL
Figure 3-2. Functional Block Diagram
DM240-DVB High-Speed Digital Modulator
DVB
CRC-8
Sync
Encoder
BCH
LDPC
Encoder
PL
BB
Filter
Symbol Clock
Slicer
Bit
Interleaver
IQ
IF Out
Modulator
TM083 - Rev. 3.0
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