Comtech EF Data SDM-2020 - Manual (Page 17)

1-1
Chapter 1. INTRODUCTION
SDM-2020
Satellite
Modulator
1.1 O
VERVIEW
The SDM-2020 is a programmable, variable-rate satellite modulator used for digital
video and high-speed data applications. The modulator supports open network modes
compliant with the ETSI EN 300 421/prEN 301 210 specification for Digital Video
Broadcasting (DVB) by satellite.
A general block diagram for the modulator is shown in Figure 1-1.
USER
INTERFACE
PLUG-IN
DATA
INTERFACE
SYNCH
AND
RANDOMIZE
RS CODER
AND
INTERLEAVER
VITERBI CODER
AND
MAPPING
DATA FILTER
AND
MODULATOR
SYNTHESIZER M&C
REMOTE PORT
AND FAULTS
TO/FROM
SYNCH AND RANDOMIZE
RS CODER AND INTERLEAVER
VITERBI CODER AND MAPPING
DATA FILTER AND MODULATOR
SYNTHESIZER
TX
IF
Figure 1-1. Modulator Block Diagram