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Theory of Operation DMDVB20 LBST Satellite Modem
3-14 TM138 – Rev. 1.0
Figure 3-7. Reed-Solomon Encoder Functional Block Diagram
Figure 3-8. Reed-Solomon Decoder Functional Block Diagram
Table 3-1. Reed-Solomon Codes
Type of
Service
Data Rate
(Kbps)
R-S Code
(n, k, t)
1
Bandwidth
Expansion
[ (n/k) -1 ]
Interleaving
Depth
Maximum
2
R-S Codec
Delay (ms)
Small IDR
(With 16/15
O/H)
64
128
256
384
512
768
1024
1536
(126, 112, 7)
(126, 112, 7)
(126, 112, 7)
(126, 112, 7)
(126, 112, 7)
(126, 112, 7)
(126, 112, 7)
(126, 112, 7)
0.125
0.125
0.125
0.125
0.125
0.125
0.125
0.125
4
4
4
4
4
4
4
4
115
58
29
19
15
10
8
5
IDR
(With 96
Kbps O/H)
1544
2048
6312
8448
(225, 205,10)
(219, 201, 9)
(194, 178, 8)
(194, 178, 8)
0.0976
0.0896
0.0899
0.0899
4
4
4
4
9
7
2
<2
8PSK
1544
2048
6312
8448
(219, 201, 9)
(219, 201, 9)
(219, 201, 9)
(219, 201, 9)
0.0896
0.0896
0.0896
0.0896
8
8
8
8
18
13
4
3
DVB
All (204, 188, 8) 0.0851 12 -
1. n = code length, k = information symbols and t = symbol error correcting capability.
2. Design objective.
- DMDVB20 LBST 1
- Warranty Policy 2
- Preface 4
- Trademarks 5
- Copyright 5
- Disclaimer 5
- Record of Revisions 5
- Table of Contents 6
- TM138 – Rev. 1.0 ix 8
- TM138 – Rev. 1.0 xi 10
- Introduction 12
- 1.1.1 Feature Upgrades 13
- 1.1.3 Hardware Options 13
- 1.2 Function Accessibility 13
- TM138 – Rev. 1.0 1-3 14
- Installation 15
- 2.1 Unpacking 16
- 2.2 Removal and Assembly 16
- 2.3 Mounting Considerations 17
- 2-4 TM138 – Rev. 1.0 18
- 2.5 Modulator Checkout 19
- 2.5.1 Initial Power-Up 19
- 2.6 Storage 19
- 2-6 TM138 – Rev. 1.0 20
- Theory of Operation 21
- 3-2 TM138 – Rev. 1.0 22
- 3.1.1 Front Panel 24
- 3.1.2 Baseband Processing 24
- TM138 – Rev. 1.0 3-5 25
- 3-6 TM138 – Rev. 1.0 26
- 3.3 Internal Clock 27
- TM138 – Rev. 1.0 3-9 29
- 3.5 Clocking Options 30
- 3.5.1 TX Clock Options 30
- 3.5.2.1 RX SAT Clock 32
- 3.7.3 Interleaving 33
- 3-14 TM138 – Rev. 1.0 34
- TM138 – Rev. 1.0 3-15 35
- 3-16 TM138 – Rev. 1.0 36
- User Interfaces 37
- 4.1.3 Numeric Keypad 38
- 4.2 Parameter Setup 40
- 4.3.1 Main Menus 40
- TM138 – Rev. 1.0 4-5 41
- 4-6 TM138 – Rev. 1.0 42
- TM138 – Rev. 1.0 4-7 43
- 4-8 TM138 – Rev. 1.0 44
- TM138 – Rev. 1.0 4-9 45
- 4-10 TM138 – Rev. 1.0 46
- TM138 – Rev. 1.0 4-11 47
- 4-12 TM138 – Rev. 1.0 48
- TM138 – Rev. 1.0 4-13 49
- 4-14 TM138 – Rev. 1.0 50
- TM138 – Rev. 1.0 4-15 51
- 4-16 TM138 – Rev. 1.0 52
- TM138 – Rev. 1.0 4-17 53
- 4-18 TM138 – Rev. 1.0 54
- TM138 – Rev. 1.0 4-19 55
- 4-20 TM138 – Rev. 1.0 56
- TM138 – Rev. 1.0 4-21 57
- 4-22 TM138 – Rev. 1.0 58
- TM138 – Rev. 1.0 4-23 59
- 4-24 TM138 – Rev. 1.0 60
- TM138 – Rev. 1.0 4-25 61
- 4-26 TM138 – Rev. 1.0 62
- TM138 – Rev. 1.0 4-27 63
- 4-28 TM138 – Rev. 1.0 64
- 4.4 Terminal Mode Control 65
- 4.6 Connecting the Terminal 66
- 4.7 Terminal Screens 66
- TM138 – Rev. 1.0 4-31 67
- Rear Panel Interfaces 68
- 5-2 TM138 – Rev. 1.0 69
- 5.3.5 EXT CLK (J16) 70
- 5.3.7 (J18) 70
- 5.3.8 EIA-530 (J19) 71
- 5.3.9 REMOTE (J20) 72
- 5-6 TM138 – Rev. 1.0 73
- 6.0 Periodic Maintenance 74
- 6.0.1 Clock Adjustment 74
- 6.1 Troubleshooting 74
- 6.1.1 Alarm Faults 75
- 6.1.1.1 Major Tx Alarms 75
- 6.1.1.2 Major Rx Alarms 76
- 6.1.1.3 Minor Tx Alarms 76
- 6.1.1.4 Minor Rx Alarms 77
- 6.1.1.5 Common Major Alarms 77
- TM138 – Rev. 1.0 6-5 78
- 6-6 TM138 – Rev. 1.0 79
- Technical Specifications 80
- 7.2 Demodulator 81
- 7.3 Monitor and Control 81
- TM138 – Rev. 1.0 7-3 82
- 7-4 TM138 – Rev. 1.0 83
- 7.8.2 DVB 84
- 7-6 TM138 – Rev. 1.0 85
- TM138 – Rev. 1.0 7-7 86
- 7-8 TM138 – Rev. 1.0 87
- TM138 – Rev. 1.0 7-9 88
- Product Options 89
- A-2 TM138 – Rev. 1.0 90
- B.0 Introduction 91
- B.1 Required Equipment 91
- B.2 Upgrade Procedure 91
- B-2 TM138 – Rev. 1.0 92
- B.3 Demonstration Procedure 93
- B-4 TM138 – Rev. 1.0 94
- TM138 – Rev. 1.0 95
- B-6 TM138 – Rev. 1.0 96
- Carrier Control 98
- C.5 Carrier RTS 99
- TM138 – Rev. 1.0 C-3 100
- Strap Codes 101
- D.1 Sample Applications 104
- TM138 – Rev. 1.0 D-5 105
- D-6 TM138 – Rev. 1.0 106
- TM138 – Rev. 1.0 D-7 107
- Glossary 108
- G-2 TM138 – Rev. 1.0 109
- TM138 – Rev. 1.0 G-3 110
- G-4 TM138 – Rev. 1.0 111
- TM138 – Rev. 1.0 G-5 112
- G-6 TM138 – Rev. 1.0 113
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