Radyne QAM256 Instructions d'exploitation télécharger pdf (Page 15)

QAM256 Digital Video Modulator and Upconverter Theory of Operation

TM077 – Rev. 4.0 3-1

Theory of Operation

3.0 Theory of Operation

A digital terrestrial interface supplies the modulator with a data stream. The data stream is

synchronized if the incoming stream is framed. The data is scrambled, and FEC is added. The

data is then convolutionally encoded, punctured, then constellation mapped. The resulting I&Q

symbols are digitally filtered. The data is then converted into an analog waveform and is vector

modulated onto an RF Carrier produced from the Transmit IF Synthesizer Circuitry.

3.1 QAM256 Operation

A block diagram of the signal flow is shown in Figure 3-1 below.

Figure 3-1. Functional Block Diagram

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 86 87

Digital Video Modulator 1
Warranty Policy 2
Preface 4
Table of Contents 6
TM077 – Rev. 4.0 ix 8
Introduction 10
1-2 TM077 - Rev. 4.0 11
Installation 12
2.2 Removal and Assembly 13
2.3 Mounting Considerations 13
TM077 – Rev. 4.0 2-3 14
Theory of Operation 15
3-2 TM077 - Rev. 4.0 16
User Interfaces 17
4.1.3 Numeric Keypad 18
4.2 Parameter Setup 19
4.3.1 Main Menus 20
TM077 – Rev. 4.0 4-5 21
4-6 TM077 - Rev. 4.0 22
TM077 – Rev. 4.0 4-7 23
4.5 Connecting the Terminal 24
4.6 Terminal Screens 24
Main Menu Screen: 25
4-10 TM077 - Rev. 4.0 26
TM077 – Rev. 4.0 4-11 27
4-12 TM077 - Rev. 4.0 28
TM077 – Rev. 4.0 4-13 29
4-14 TM077 - Rev. 4.0 30
TM077 – Rev. 4.0 4-15 31
4-16 TM077 - Rev. 4.0 32
Rear Panel Interfaces 33
5.3 TX MON Port 34
5.4 TX IF Port 34
TM077 – Rev. 4.0 5-3 35
5.5.1 TX PARALLEL Connector 36
5.5.2 REMOTE Connector 36
5.5.3 TX ASI Connector 36
5.8 Optional DVB Interface 37
5-6 TM077 - Rev. 4.0 38
TM077 – Rev. 4.0 5-7 39
6.0 Periodic Maintenance 40
6-2 TM077 - Rev. 4.0 41
Technical Specifications 42
7.2.1 RF Interface 43
7.2.2 Baseband Interface 43
7.2.3 Remote Interface 43
7.2.4 Physical 43
TM077 – Rev. 4.0 7-3 44
Product Options 45
A-2 TM077 - Rev. 4.0 46
SNMP MIB 47
B-2 TM077 – Rev. 4.0 48
TM077 – Rev. 4.0 B-3 49
B-4 TM077 – Rev. 4.0 50
TM077 – Rev. 4.0 B-5 51
B-6 TM077 – Rev. 4.0 52
TM077 – Rev. 4.0 B-7 53
B-8 TM077 – Rev. 4.0 54
TM077 – Rev. 4.0 B-9 55
Remote Operations 56
C.1.2 Protocol Wrapper 57
TM077 – Rev. 4.0 C-3 58
02h = 00000010b 58
C-4 TM077 – Rev. 4.0 59
RESPONSE OPCODE DESCRIPTION 59
Invalid Control Mode 59
C.1.5 Collision Avoidance 60
C.1.6 Software Compatibility 61
C.1.8 RLLP Summary 62
C-8 TM077 – Rev. 4.0 63
TM077 – Rev. 4.0 C-9 64
C-10 TM077 – Rev. 4.0 65
TM077 – Rev. 4.0 C-11 66
C-12 TM077 – Rev. 4.0 67
TM077 – Rev. 4.0 C-13 68
C-14 TM077 – Rev. 4.0 69
TM077 – Rev. 4.0 C-15 70
C-16 TM077 – Rev. 4.0 71
TM077 – Rev. 4.0 C-17 72
C-18 TM077 – Rev. 4.0 73
TM077 – Rev. 4.0 C-19 74
C-20 TM077 – Rev. 4.0 75
TM077 – Rev. 4.0 C-21 76
C-22 TM077 – Rev. 4.0 77
TM077 – Rev. 4.0 C-23 78
C-24 TM077 – Rev. 4.0 79
TM077 – Rev. 4.0 C-25 80
C-26 TM077 – Rev. 4.0 81
Glossary 82
G-2 TM077 – Rev. 4.0 83
TM077 – Rev. 4.0 84
G-4 TM077 – Rev. 4.0 85
G-6 TM077 – Rev. 4.0 87

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Radyne QAM256 Instructions d'exploitation Page 15

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