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SDM-100A Satellite Modem Installation
Rev. 0 2–7
2.4.3 Faults (J7)
The Fault connector on the modem is used to interface FORM-C contact closures for the
purpose of fault reporting. There are three FORM-C summary fault contacts:
• Modulator
• Demodulator
• Common equipment
For further discussion on the monitored faults, refer to Chapter 3.
To obtain a system summary fault, connect all FORM-C contacts in parallel.
The fault interface is provided on a 9-pin female D connector. Screw locks are provided
for mechanical security on the mating connector.
Pin # Name Function
1 NO Common Equipment is OK
2 COM
3 NC Common Equipment is FAULTED
4 NO Modulator is OK
5 COM
6 NC Modulator is FAULTED
7 NO Demodulator is OK
8 COM
9 NC Demodulator is FAULTED
Note: A connection between the Common (COM) and Normally Open (NO) contacts
indicates no fault.
2.4.4 TX IF Output (CP1)
This is the transmit IF connector. The output impedance is 75Ω (50Ω optional), and the
output power level is -5 to -30 dBm, in 0.1 dB steps.
For normal operation, the output will be a QPSK modulated result of the DATA I/O
connector, between 50 and 180 MHz.
- SDM-100A 1
- Preface 5
- Military Standards 6
- Trademarks 6
- Related Documents 6
- European EMC Directive 7
- Customer Support 8
- Table of Contents 9
- Rev. 0 vii 11
- Rev. 0 ix 13
- Figures 14
- Rev. 0 xi 15
- Chapter 1 17
- INTRODUCTION 17
- 1.1 Purpose and Function 18
- 1.2 Description 19
- 1.3 Options 20
- 1.3.1 ASYNC/AUPC Interface 20
- 1.3.2 ADPCM Voice 20
- 1.4 Modem Specifications 21
- 1.5 BER Performance 23
- 1–8 Rev. 0 24
- Rev. 0 1–9 25
- 1–10 Rev. 0 26
- Chapter 2 27
- INSTALLATION 27
- 2.2 System Installation 28
- 2.3 System Requirements 29
- 2–4 Rev. 0 30
- 2.4 External Connections 31
- 2.4.2 Remote (J6) 32
- 2.4.3 Faults (J7) 33
- 2.4.4 TX IF Output (CP1) 33
- 2.4.5 RX IF Input (CP2) 34
- 2.4.6 AC Power 34
- 2.4.7 DC Power 34
- 2.4.8 GND 34
- 2.4.9 AGC Test Point 34
- Chapter 3 35
- OPERATION 35
- 3.1.2 LED Indicators 36
- 3.1.3 Front Panel Controls 37
- 3.2 Menu System 38
- Rev. 0 3–5 39
- 3–6 Rev. 0 40
- 3.2.1.1 Configuration 41
- 3–8 Rev. 0 42
- Rev. 0 3–11 45
- 3–12 Rev. 0 46
- Rev. 0 3–15 49
- 3–16 Rev. 0 50
- Rev. 0 3–17 51
- Rev. 0 3–21 55
- 3–22 Rev. 0 56
- 3–24 Rev. 0 58
- 3.2.1.2 Monitor 59
- 3.2.1.3 Faults/Alarms 60
- Rev. 0 3–27 61
- 3–28 Rev. 0 62
- 3.2.1.3.1 Modulator Faults 63
- Rev. 0 3–33 67
- 3–34 Rev. 0 68
- Rev. 0 3–35 69
- 3.2.1.5 Remote AUPC 70
- 3.2.1.6 Utility 71
- 3–38 Rev. 0 72
- 3.2.1.6.1 Utility Modulator 73
- Rev. 0 3–41 75
- 3–42 Rev. 0 76
- 3–44 Rev. 0 78
- 3.2.1.6.3 Utility Interface 79
- Rev. 0 3–47 81
- 3–48 Rev. 0 82
- 3.2.1.6.4 Utility System 83
- again to reset the 84
- Rev. 0 3–51 85
- 3–52 Rev. 0 86
- Rev. 0 3–53 87
- 3–54 Rev. 0 88
- ↑] or [↓] to increase or 91
- ←] and [→] to move the 93
- Rev. 0 3–61 95
- 3–62 Rev. 0 96
- 3–64 Rev. 0 98
- Rev. 0 3–65 99
- 3.2.2.5 Utility Functions 100
- Rev. 0 3–67 101
- 3–68 Rev. 0 102
- 3–70 Rev. 0 104
- 3–72 Rev. 0 106
- ↑] or [↓] to 107
- ↑] or [↓] to select ON 107
- SATELLITE 111
- DATA MODEM 111
- 3.3 Clocking Options 113
- 3.3.1 Master/Master 113
- 3.3.2 Master/Slave 113
- 3–80 Rev. 0 114
- Rev. 0 3–81 115
- 3–82 Rev. 0 116
- Chapter 4 117
- THEORY OF OPERATION 117
- ± 1 x 10 119
- ± 1 dB to 119
- STANDARD 120
- NON-STANDARD 120
- 4.1.2 Specifications 121
- 4.2 Demodulator 122
- 4.2.1 Theory of Operation 122
- 4.2.2 Specifications 122
- RX CLOCK 123
- 4–8 Rev. 0 124
- Rev. 0 4–9 125
- 4–10 Rev. 0 126
- 4.3 Monitor and Control 127
- 4.3.1 Non-Volatile Memory 127
- 4–12 Rev. 0 128
- 4.3.5 Modem Defaults 129
- 4.4 Digital Interfaces 130
- 4.4.1 RS-422 Interface 130
- 4–16 Rev. 0 132
- 4.4.1.1 Connector Pinouts 133
- 0.0, ± 0.4V 134
- Rev. 0 4–19 135
- 4–20 Rev. 0 136
- 4.4.2.1 Connector Pinouts 137
- 4.4.2.2 Specification 138
- 4.4.3 RS-232-C Interface 138
- 4.4.3.1 Theory of Operation 139
- 4–24 Rev. 0 140
- 4.4.3.2 Connector Pinouts 141
- Chapter 5 143
- MAINTENANCE 143
- 5.1.2 Modulator Checkout 144
- 5.1.3 Demodulator Checkout 144
- Rev. 0 5–3 145
- Various Code Rates 146
- WITH NOISE 147
- WITHOUT NOISE 147
- 5.1.4 Test Points 148
- INTERFACE FAULTS 150
- MOD FAULTS 150
- DEMOD FAULTS 150
- COMMON EQUIPMENT FAULTS 150
- 5.3 Module Identification 151
- 5–10 Rev. 0 152
- Appendix A 153
- REMOTE CONTROL OPERATION 153
- A.2 Message Structure 154
- A.2.1 Start Character 154
- A.2.2 Device Address 154
- A.2.3 Command/Response 155
- A.2.4 End Character 155
- Command: 156
- (MPO_) 157
- A.3.2 Demodulator 158
- Rev. 0 A–7 159
- A.3.3 Interface 160
- Rev. 0 A–9 161
- A–10 Rev. 0 162
- Rev. 0 A–11 163
- A.3.4 System 164
- A.3.5 AUPC 164
- Rev. 0 A–13 165
- Modulator Output Power 166
- A–16 Rev. 0 168
- Rev. 0 A–17 169
- A–18 Rev. 0 170
- Rev. 0 A–19 171
- A–20 Rev. 0 172
- Rev. 0 A–21 173
- A–22 Rev. 0 174
- Rev. 0 A–23 175
- A–24 Rev. 0 176
- Rev. 0 A–25 177
- A–26 Rev. 0 178
- A.4.2 Error Performance 179
- A.5 Stored Faults 180
- Rev. 0 A–29 181
- A–30 Rev. 0 182
- Appendix B 183
- OPTIONS 183
- B–2 Rev. 0 184
- B.1.1 Theory of Operation 186
- B.1.1.5 Buffer Operation 187
- B.1.1.8 Non-ASYNC Operation 188
- B.1.2.1 Top Cover Removal 190
- B.1.2.3 EPROM Installation 190
- B.1.2.4 ASYNC Interface 190
- B.1.3 Front Panel Operation 191
- B.1.3.3 Demodulation 192
- B.1.3.4 Utility/Interface 192
- B.1.3.5 Specifications 193
- Rev. 0 B–13 195
- B.2.1.1 Multiplexer 196
- B.2.1.2 Demultiplexer 196
- B.2.1.3 Protection Switch 197
- B.2.1.4 RS-422 Interface 197
- B.2.2 Front Panel Operation 198
- B.2.2.1 Interface 198
- B.2.2.4 Utility/Interface 199
- B.2.2.5 TX Alarm Indication 199
- B.2.2.6 RX Alarm Indication 199
- B.2.2.7 DEMUX Lock 199
- B.2.2.8 Remote Off Hook 199
- B.2.3 Specifications 200
- B.3 Reed-Solomon Codec 201
- B.3.1 Reed-Solomon Encoder 201
- B–20 Rev. 0 202
- Rev. 0 B–21 203
- B.3.2 Reed-Solomon Decoder 204
- Rev. 0 B–23 205
- B–24 Rev. 0 206
- Glossary 207
- METRIC CONVERSIONS 211
- Units of Length 211
- Temperature Conversions 211
- Units of Weight 211
- 480 • 333 • 2200 PHONE 212
- 480 • 333 • 2161 212
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