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Theory of Operation SDM-100A Satellite Modem
4–14 Rev. 0
4.4 Digital Interfaces
The modem interface module is a daughter card that plugs onto the demodulator board. It
provides the interface for terrestrial data and overhead signals, and provides the fault
reporting output of the modem.
RS-422/449, V.35, RS-232-C, and ASYNC interfaces are available for input and output
of terrestrial data.
Both baseband and interface loopbacks are provided.
Terrestrial data rates from 19.2 to 128 kbit/s are supported.
4.4.1 RS-422 Interface
The RS-422 digital interface provides level translation, buffering, and termination
between the internal modem signals and the interface connector on the rear panel.
Electrical characteristics of the RS-422 interface signals are defined in EIA STD RS-422,
and details of the mechanical interface are found in EIA STD RS-449. For the electrical
and mechanical specifications, refer to Sections 4.4.1.1 and 4.4.1.2.
Refer to Figure 4-6 for a functional diagram of the interface.
The RS-422 interface provides a Send Timing (ST) clock signal at the modem data rate.
• In the INTERNAL clock mode, the data to be transmitted, Send Data (SD), must
be synchronized to ST.
• In the EXTERNAL clock mode, the clock is accepted on the Terminal Timing
(TT) input to clock-in the data to be transmitted.
In either case, the phase relationship between the clock and data is not important as long
as it meets the jitter specifications of RS-422/449. This is because a clock phase
correction circuit is provided, which shifts the clock away from the data transition times.
The clock phasing is jumper selectable at JP1. Refer to Table 4-1 for jumper settings.
• The AUTO setting is used when there is no jitter on the clock source.
• The NORMAL setting is used when standard specifications on clock and data
relationships exist.
• The INVERT mode is used when the incoming clock is inverted from the
standard clock and data relationship.
- 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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