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SDM-100A Satellite Modem Theory of Operation
Rev. 0 4–25
Two fault outputs are provided on dry contact Form-C relays on the Demodulator/M&C
card, and are sent to the interface card. The signals are buffered and output for use in
monitoring fault status, and are available on the FAULT connector on the modem rear
panel. These are:
• MODULATOR faults
• DEMODULATOR faults
Generation of these fault conditions is described in Chapter 3.
4.4.3.2 Connector Pinouts
The RS-232-C interface is provided on a 25-pin D female connector (DCE) accessible
from the rear panel of the modem. Screw locks are provided for mechanical security of
the mating connector.
Signal Function Name Pin #
Ground GND 1, 7
Send Data SD 2
Receive Data RD 3
Request To Send RTS 4 (See note below)
Clear To Send CTS 5 (See note below)
Data Mode DM 6
Receiver Ready RR 8
Master Clock MC 9
Demod Fault DF 11
Send Timing ST 15
Receive Timing RT 17
Terminal Timing TT 24
Mod Fault MF 25
No Connection 10, 12, 14, 16, 19, 20, 21, 22, 23
Note: The Request to Send (RTS) line is normally hard-wired to the Clear to Send
(CTS) line by JP11, pins 5 and 6, on the Demodulator/M&C card (AS/4973).
- 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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