Introduction, Overview, Chapter 1. introduction – Comtech EF Data SDM-2020 User Manual

Page 17: Sdm-2020 satellite modulator, Verview

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1-1

Chapter 1. INTRODUCTION

SDM-2020

Satellite

Modulator

1.1

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

Figure 1-1. Modulator Block Diagram