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SDM-309B Satellite Modem Theory of Operation
MN/U-SDM309B Rev. # 5-5–19
5.3.3 Theory of Operation
As mentioned in Section 5.3.1, the Demodulator is composed of six basic subSections.
The first three make up the RF portions of the board while the last three handle the
baseband processing. A Costas Loop is used for carrier recovery, however the
Demodulator board provides only the I and Q channel signals and has a VCXO input. It
does not do the costas processing.
The incoming modulated carrier enter the Demodulator in the AGC Amplifier (1) where
it is filtered and amplified. The AGC circuit, which is controlled off card, provides
variable gain to maintain the signal level into the IF converter at a constant level over the
entire input dynamic range. The signal is converted to the fixed IF by the Frequency
Synthesizer (3). The Synthesizer is programmable externally, to allow for acquisitions of
carriers in the 50 to 90 MHz or 100 to 180 MHz range.
The IF is split into two channels in the Quadrature Demodulator (2). Using an in-phase
and a quadrature carrier from a VCXO controlled externally, the quadrature demodulator
produces the I and Q channel baseband signals. These two signals are amplified and
filtered in the Nyquist Filters (4). These filters are matched filters to those of the
transmitter resulting in optimal detection of the transmitted data. In addition, they
effectively remove adjacent channels which could corrupt the detection process.
The signal is amplified to the final level in the Baseband Amplifier (5). At this point the
signal looks like the classic "Eye Pattern". It is then quantized in the Soft Decision
Interface (6) and output to the card I/O connector.
5.4 Reacquisition, Fast Acquisition And Directed Sweep
5.4.1 General
The fast acquisition algorithm has been permanently installed in the 4.XX and 6.XX
versions of the modem software. The carrier should be acquired within 30 seconds
regardless of the symbol rate. The upper limit on the symbol rate for fast acquisition is
128 Kbps. The lower limit is 64 Kbps. Fast acquisition will work in conjunction with the
sweep reacquisition function. However, fast acquisition will not work concurrently with
the directed sweep function. The sweep range parameter must be set at 50000 Hz to
enable fast acquisition. If the sweep range is set at any frequency less than 50000 Hz, the
modem is in the directed sweep mode. Turning on the directed sweep function
automatically disables the fast acquisition function.
- SDM-309B 1
- SDM-309BSDM-309B 1
- Warranty Policy 3
- Limitations of Warranty 3
- Exclusive Remedies 3
- Disclaimer 3
- About this Manual 4
- Cautions and Warnings 4
- Metric Conversion 4
- Trademarks 5
- Customer Support 6
- Table of Contents 8
- Rev. 0 vii 10
- Rev. 0 ix 12
- Chapter 1 14
- INTRODUCTION 14
- 1-1–2 MN/U-SDM309B Rev. # 15
- Figure 1-1 SDM-309B Modem 16
- 1-1–4 MN/U-SDM309B Rev. # 17
- MN/U-SDM309B Rev. # 1-1–5 18
- 1-1–6 MN/U-SDM309B Rev. # 19
- 1.4 System Specification 20
- 1-1–10 MN/U-SDM309B Rev. # 23
- MN/U-SDM309B Rev. # 1-1–11 24
- 1-1–12 MN/U-SDM309B Rev. # 25
- Chapter 2 26
- INSTALLATION 26
- Figure 2-1 Rear Panel View 28
- 2.2.1 Data I/O 29
- 2.2.2 Remote (J6) 29
- 2.2.3 Fault (J7) 29
- 2.2.4 IF Output (CP1) 30
- 2.2.5 IF Input (CP2) 30
- 2.2.6 AC Power 30
- 2.2.7 GND 30
- 2.3 System Requirements 30
- 2.4 System Installation 31
- Chapter 3 32
- OPERATION 32
- 3.1.3 Front Panel Controls 33
- Figure 3-1 Front Panel View 34
- 3.1.4 Configuration 35
- 3.1.4.1 MOD Configuration 35
- 3.1.4.2 DEMOD Configuration 36
- 3.1.5 Monitor 41
- 3.1.6 Faults 41
- 3.1.7 Stored Faults 43
- 3.1.8 Utility 43
- Figure 3-2 Menu Tree 47
- Figure 3-3 Menu Tree 48
- Figure 3-4 Menu Tree 49
- Figure 3-5 Menu Tree 50
- Figure 3-6 Menu Tree 51
- Figure 3-7 Menu Tree 52
- Figure 3-8 IF Loopback 53
- Figure 3-9 RF Loopback 54
- 3–24 MN/U-SDM309B Rev. # 55
- MN/U-SDM309B Rev. # 3–25 56
- 3.2.1 General 57
- 3.2.2 Configuration 57
- 3.2.2.1 MOD Configuration 58
- 3.2.2.2 DEMOD Configuration 59
- 3.2.3 Monitor 65
- 3.2.4 Faults 66
- 3.2.5 Stored Faults 67
- 3.2.6 Utility 68
- Figure 3-12 Menu Tree 71
- Figure 3-13 Menu Tree 72
- Figure 3-14 Menu Tree 73
- Figure 3-15 Menu Tree 74
- Figure 3-16 Menu Tree 75
- Figure 3-17 Menu Tree 76
- 3–46 MN/U-SDM309B Rev. # 77
- Chapter 4 78
- M&C AND INTERFACES 78
- Connect JP7 to RS232 79
- MN/U-SDM309B Rev. # 4-4–3 80
- 4.1.2.2 Remote Baud Rate 81
- 4.1.2.3 Remote Address 81
- 4.1.2.4 Battery 81
- 4.1.2.8 Utility Defaults 83
- 4.2 Digital Interfaces 83
- 4.2.1 IBS/M1200P Interface 84
- 4.2.1.2 Data Interface 84
- 4.2.1.3 Transmit Multiplexer 84
- 4-4–8 MN/U-SDM309B Rev. # 85
- MN/U-SDM309B Rev. # 4-4–9 86
- 4-4–10 MN/U-SDM309B Rev. # 87
- Figure 4-4 IBS Fault Tree 88
- Figure 4-5 Jumper Table 89
- 4.2.1.4 Receive Multiplexer 90
- 4-4–18 MN/U-SDM309B Rev. # 95
- 4.2.1.9.7 Send Data (J7) 98
- 4.2.1.9.8 Receive Data (J8) 99
- MN/U-SDM309B Rev. # 4-4–23 100
- 4-4–24 MN/U-SDM309B Rev. # 101
- 4.2.2.2 Data Interface 102
- 4.2.2.3 Transmit Multiplexer 102
- 4.2.2.7 Backward Alarm 103
- MN/U-SDM309B Rev. # 4-4–27 104
- 4-4–28 MN/U-SDM309B Rev. # 105
- MN/U-SDM309B Rev. # 4-4–29 106
- 4-4–30 MN/U-SDM309B Rev. # 107
- MN/U-SDM309B Rev. # 4-4–31 108
- MN/U-SDM309B Rev. # 4-4–35 112
- 4.2.2.10.11 Faults (J11) 115
- 4.2.2.11 Rear Panel Switches 116
- 4.2.2.11.1 Drop Data Input 116
- 4.2.2.11.2 Drop Data Output 116
- 4.2.2.11.3 Insert Data Input 116
- 4-4–40 MN/U-SDM309B Rev. # 117
- MN/U-SDM309B Rev. # 4-4–41 118
- Table 4-3 119
- MN/U-SDM309B Rev. # 4-4–43 120
- 4-4–44 MN/U-SDM309B Rev. # 121
- 4.3.1 Master/Slave 122
- 4.3.1.2 Master/Slave G.703 123
- 4.3.1.3 Master/Slave X.21 123
- 4.3.2 Master/Master 123
- Chapter 5 125
- THEORY OF OPERATION 125
- Figure 5-1 Modulator Card 127
- 5-5–4 MN/U-SDM309B Rev. # 128
- MN/U-SDM309B Rev. # 5-5–5 129
- 5.1.3 Theory of Operation 130
- 5.2.1 General Description 131
- MN/U-SDM309B Rev. # 5-5–9 133
- 5-5–10 MN/U-SDM309B Rev. # 134
- MN/U-SDM309B Rev. # 5-5–11 135
- 5-5–12 MN/U-SDM309B Rev. # 136
- MN/U-SDM309B Rev. # 5-5–13 137
- 5.2.3 Theory Of Operation 138
- 5.2.3.1 Demod Processor 138
- 5.2.3.2 Viterbi Decoder 138
- 5.3 Demodulator 139
- 5.3.1 General Description 139
- 5.3.2 Specifications 140
- Figure 5-9 Demodulator Card 141
- 5-5–18 MN/U-SDM309B Rev. # 142
- 5.3.3 Theory of Operation 143
- 5.4.1 General 143
- 5.4.2 Reacquisition 144
- 5.4.3 Fast Acquisition 145
- 5.4.4 Directed Sweep 145
- Chapter 6 146
- MAINTENANCE 146
- 6-6–2 MN/U-SDM309B Rev. # 147
- MN/U-SDM309B Rev. # 6-6–3 148
- 6-6–4 MN/U-SDM309B Rev. # 149
- Table 6-1 150
- 6-6–6 MN/U-SDM309B Rev. # 151
- MN/U-SDM309B Rev. # 6-6–7 152
- 6.1.4 Test Points 153
- Figure 6-6 154
- Figure 6-7 155
- Figure 6-8 156
- Figure 6-9 157
- 6.2 Fault Isolation 158
- 6.2.1 Modulator Faults 158
- 6.2.2 Demodulator Faults 159
- Table 6-2 162
- 6-6–18 MN/U-SDM309B Rev. # 163
- MN/U-SDM309B Rev. # 6-6–19 164
- 6-6–20 MN/U-SDM309B Rev. # 165
- MN/U-SDM309B Rev. # 6-6–21 166
- 6.4 Module Replacement 167
- 6.5 Module Identification 167
- 6.6 Repacking For Shipment 167
- Table 6-3 168
- Appendix A 169
- DATA RATES AND FILTERS 169
- 1.2 Variable Rate Filters 170
- MN/U-SDM309B Rev. # A–3 171
- A–4 MN/U-SDM309B Rev. # 172
- MN/U-SDM309B Rev. # A–5 173
- A–6 MN/U-SDM309B Rev. # 174
- MN/U-SDM309B Rev. # A–7 175
- A–8 MN/U-SDM309B Rev. # 176
- MN/U-SDM309B Rev. # A–9 177
- Appendix B 178
- SATELLITE MODEM REMOTE 178
- 3.4 End Character 179
- 3.1 Start Character 179
- 3.2 Device Address 179
- 3.3 Command/Responses 179
- 4.2.2 Demodulator Rate 183
- 4.2.4 RF Loop-back (ON/OFF) 184
- 4.2.5 IF Loop-back (ON/OFF) 184
- 4.2.7 Sweep Reacquisition 185
- 4.2.8 Fast Acquisition Mode 185
- 4.2.9 Sweep Center Frequency 185
- 4.2.10 Sweep Width Range 186
- 4.2.11 Sweep Direction 186
- 4.3.12 Interface Buffer Size 188
- 4.3.13 Transmit Data Fault 189
- 4.3.14 Receive Data Fault 189
- 4.3.15 Drop Data Format 189
- 4.3.16 Insert Data Format 189
- 4.4.1 Time Of Day 191
- 4.4.2 Date 191
- 5.3 Modulator Status 195
- 5.4 Demodulator Status 195
- 5.5 Common Equipment Status 196
- 5.8 Bit Error Rate Status 197
- 5.8.1 Raw BER 197
- 5.8.2 Corrected BER 197
- 5.8.3 Corrected BER Log 197
- 5.9 Eb/N0 Status 198
- 5.10 Modulator Rate Status 198
- 5.11 Demodulator Rate Status 198
- 5.13 Current Sweep Value 199
- 5.16 Stored Faults 199
- MN/U-SDM309B Rev. # B-B–23 200
- B-B–28 MN/U-SDM309B Rev. # 205
- 5.20 Change Status 206
- 5.21 Equipment Type 206
- B-B–30 MN/U-SDM309B Rev. # 207
- Appendix C 208
- EXTERNAL CHANNEL UNIT 208
- C-C–2 MN/U-SDM309B Rev. # 209
- MN/U-SDM309B Rev. # C-C–3 210
- C-C–4 MN/U-SDM309B Rev. # 211
- MN/U-SDM309B Rev. # C-C–5 212
- C-C–6 MN/U-SDM309B Rev. # 213
- MN/U-SDM309B Rev. # C-C–7 214
- C-C–8 MN/U-SDM309B Rev. # 215
- MN/U-SDM309B Rev. # C-C–9 216
- C-C–10 MN/U-SDM309B Rev. # 217
- 2.0 Digital Interfaces 218
- 2.1.1 Functional Description 218
- C-C–12 MN/U-SDM309B Rev. # 219
- MN/U-SDM309B Rev. # C-C–13 220
- C-C–14 MN/U-SDM309B Rev. # 221
- 2.1.2 Connector Pinouts 223
- 2.1.3 Specification 223
- 2.2 V.35 Interface 224
- 2.2.1 Functional Description 224
- MN/U-SDM309B Rev. # C-C–19 226
- C-C–20 MN/U-SDM309B Rev. # 227
- 2.2.2 Connector Pinouts 228
- 2.2.3 Specification 228
- 3.0 Front Panel Operation 229
- 3.1 Configuration 229
- 3.2 Monitor 232
- 3.3 Faults 232
- 3.4 Stored Faults 233
- 3.5 Utility 233
- Figure C-13 Menu Tree 235
- Figure C-14 Menu Tree 236
- Figure C-15 Menu Tree 237
- MN/U-SDM309B Rev. # C-C–31 238
- Appendix D 239
- SOFTWARE CHANGE 239
- SPECIFICATIONS 239
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