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DMD1050 Satellite Modem Board Theory of Operation
3.1.1 DMD1050 L-Band Printed Circuit Card
The L-Band/IF Printed Circuit Card consists of an analog modulation function, an analog
complex down conversion, and two wide-band digital synthesizers. The block diagram of the L-
Band Assembly is shown in Figure 3-2.
Quadrature
Demodulator
IF Board Connector (40-Pin Header)
Demodulator I
Demodulator I Inv.
Demodulator Q
Demodulator Q Inv.
AGC
L-Band
Synthesizer
PDA
Analog Q Inv.
Analog I Inv.
L-Band
Synthesizer
Quadrature
Modulator
Analog Q
Analog I
LPF
LPF
Switch
RxLB
TxLB
Coupler
DCSA
Figure 3-2. L-Band Assembly
In the modulator, analog in-phase (I) and quadrature (Q) signals are generated on the Digital
Baseband Printed Circuit Card, routed to the L-Band Printed Circuit Card, and modulated at the
desired frequency. The L-Band modulated signal is then passed through a microprocessor
controlled variable attenuator providing gain control of the output signal.
In the complex downconverter, the signal for demodulation is amplified and sent through a
variable wideband attenuator for AGC. The gain-controlled signal is then passed through a
complex downconverter to a low IF.
3.1.2 DMD1050 Baseband Processing Printed Circuit Card
The advent of million-plus gate count FPGAs, advanced logic synthesis tools, and DSPs
providing hundreds of MIPs enabled the design of a software configurable modem. Large, fast
FPGAs now provide designers with what is essentially an on the fly programmable ASIC. High
speed, complex digital logic functions that previously could only be implemented in dedicated
integrated circuits are now downloaded from a micro-controller through a serial or peripheral
interface. When a new digital logic function is needed, a new configuration file is loaded into the
MN-DMD1050 3–2
Revision 9
- DMD1050 1
- Table of Contents 5
- PREFACE 11
- Warranty Policy 12
- Limitations of Warranty 12
- Exclusive Remedies 13
- Customer Support 14
- Chapter 1. Introduction 15
- 1.2 DMD1050 Configurations 16
- 1.2.2 Feature Upgrades 16
- 1.3 Function Accessibility 16
- Chapter 2. Installation 17
- 2.2 Unpacking 18
- 2.3 Removal and Assembly 18
- MN-DMD1050 2–3 19
- 2.6 Modulator Checkout 20
- 2.6.1 Initial Power-Up 20
- MN-DMD1050 2–5 21
- 2.7 Storage 22
- 3.1 DMD1050 Hardware 23
- MN-DMD1050 3–2 24
- MN-DMD1050 3–3 25
- 3.2.1 Baseband Processing 26
- MN-DMD1050 3–5 27
- 3.3.2 Terminal Mode Control 28
- MN-DMD1050 3–7 29
- 3.3.6 Terminal Screens 30
- MN-DMD1050 3–10 32
- 3.7.1.6 Ethernet QOS Type 33
- 3.7.1.7 Ethernet QOS Queue 33
- MN-DMD1050 3–12 34
- 3.7.1.9 Packet Statistics 35
- 3.8 Internal Clock 35
- MN-DMD1050 3–15 37
- MN-DMD1050 3–16 38
- 3.10.1 TX Clock Options 39
- 3.10.3 RX SAT Clock 41
- 3.12 Reed-Solomon Codec 42
- 3.12.3 Interleaving 43
- 3.13.1 Radyne AUPC 44
- 3.13.2 EF AUPC 45
- 3.13.3 Near Side AUPC 45
- MN-DMD1050 3–25 47
- MN-DMD1050 3–26 48
- MN-DMD1050 3–27 49
- MN-DMD1050 3–28 50
- 3.17.1 SCC Framing Structure 51
- 3.17.2 Aggregate Data Rate 52
- MN-DMD1050 3–31 53
- Example 1: 54
- Example 2: 54
- MN-DMD1050 3–33 55
- MN-DMD1050 3–34 56
- 3.19 Strap Codes 57
- MN-DMD1050 3–36 58
- 4.1 DMD1050 Connections 59
- MN-DMD1050 4–2 60
- MN-DMD1050 4–3 61
- MN-DMD1050 4–4 62
- MN-DMD1050 4–5 63
- MN-DMD1050 4–6 64
- MN-DMD1050 4–7 65
- MN-DMD1050 4–8 66
- MN-DMD1050 4–9 67
- MN-DMD1050 4–10 68
- CAUTION 69
- 5.2.1 Alarm Faults 70
- 5.2.1.1 Major Tx Alarms 70
- 5.2.1.2 Major Rx Alarms 70
- 5.2.1.3 Minor Tx Alarms 70
- 5.2.1.4 Minor Rx Alarms 71
- 5.2.1.5 Common Major Alarms 71
- 5.2.2 Alarm Masks 71
- Chapter 6. Technical 73
- Specifications 73
- MN-DMD1050 6–2 74
- 6.9.1 Non-DVB 75
- 6.9.2 DVB 76
- MN-DMD1050 6–5 77
- Viterbi 78
- Sequentia 79
- Trellis 81
- Viterbi Decoder 83
- MN-DMD1050 6–12 84
- MN-DMD1050 6–13 85
- MN-DMD1050 6–14 86
- MN-DMD1050 6–15 87
- MN-DMD1050 6–16 88
- MN-DMD1050 6–17 89
- 6.10.11 ACG Output Voltage 90
- Chapter 7. Web Browser 91
- 7.2.1 Appearance 92
- 7.2.2 Navigation 92
- 7.2.3 LED Indicators 93
- 7.3 GUI Screen Menus 94
- 7.3.1 Introduction Menu 95
- 7.3.1.1 Login Screen 96
- 7.3.2 Password Setup 97
- MN-DMD1050 7–8 98
- MN-DMD1050 7–9 99
- MN-DMD1050 7–10 100
- Revision 9 100
- MN-DMD1050 7–11 101
- MN-DMD1050 7–12 102
- Configuring the PC 103
- 7.3.4.1 Transmit Menu 104
- MN-DMD1050 7–15 105
- MN-DMD1050 7–16 106
- MN-DMD1050 7–17 107
- MN-DMD1050 7–18 108
- MN-DMD1050 7–19 109
- MN-DMD1050 7–20 110
- MN-DMD1050 7–21 111
- 7.3.4.2 Receive Menu 112
- MN-DMD1050 7–23 113
- MN-DMD1050 7–24 114
- MN-DMD1050 7–25 115
- MN-DMD1050 7–26 116
- MN-DMD1050 7–27 117
- 7.3.4.3 Interface Menu 118
- MN-DMD1050 7–29 119
- MN-DMD1050 7–30 120
- MN-DMD1050 7–31 121
- MN-DMD1050 7–32 122
- 7.3.4.4 Monitor Menu 123
- MN-DMD1050 7–34 124
- MN-DMD1050 7–35 125
- MN-DMD1050 7–36 126
- 7.3.4.5 Alarms Menu 127
- MN-DMD1050 7–38 128
- MN-DMD1050 129
- MN-DMD1050 7–40 130
- MN-DMD1050 7–41 131
- MN-DMD1050 7–42 132
- MN-DMD1050 7–43 133
- 7.3.4.5.1 System Menu 134
- MN-DMD1050 7–45 135
- MN-DMD1050 7–46 136
- 7.3.4.6 Test Menu 137
- Test Pattern 137
- MN-DMD1050 7–48 138
- A.1 Hardware Options 139
- A.2 Internal High-Stability 139
- A.3 Customized Options 139
- MN-DMD1050 A–2 140
- B.1 States 141
- B.2 Carrier Off 141
- B.3 Carrier On 141
- B.4 Carrier Auto 141
- B.5 Carrier VSat 142
- B.6 Carrier RTS 142
- Appendix C. TCP/IP Ethernet 143
- IMPORTANT 144
- C.4 Ethernet Test 145
- MN-DMD1050 C–4 146
- MN-DMD1050 C–5 147
- MN-DMD1050 C–6 148
- MN-DMD1050 C–7 149
- MN-DMD1050 C–8 150
- Appendix D. Web Browser 151
- Setup Guide 151
- MN-DMD1050 D–2 152
- MN-DMD1050 D–3 153
- D.4.1 Configuring the modem 154
- MN-DMD1050 D–5 155
- MN-DMD1050 D–6 156
- MN-DMD1050 D–7 157
- MN-DMD1050 D–8 158
- Appendix E.User Interface 159
- Connections 159
- MN-DMD1050 E–3 161
- 08-56-0106 162
- Appendix F.Ethernet Data 163
- Interface 163
- MN-DMD1050 F–2 164
- MN-DMD1050 F–3 165
- MN-DMD1050 F–4 166
- Figure F-4 – High Speed Mesh 167
- MN-DMD1050 F–6 168
- MN-DMD1050 F–7 169
- Prioritized Queues 170
- F.8.1 Normal QOS 171
- F.8.2 Port Based QOS 171
- F.8.3 Fair Weighted Queuing 171
- MN-DMD1050 F–10 172
- MN-DMD1050 F–12 174
- Appendix G. DMD1050 Strap 175
- Dis = Disable 176
- Procedure 179
- MN-DMD1050 H–2 180
- MN-DMD1050 H–3 181
- H.8 Monitor and Control 182
- METRIC CONVERSIONS 183
- Units of Length 183
- Temperature Conversions 183
- Units of Weight 183
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