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SDM-309B Satellite Modem Maintenance
MN/U-SDM309B Rev. # 6-6–9
6.1.4.2 Demodulator (Figure 6-6)
TP10 VCXO Control Voltage
Approximately 0 to +2.5V sweep range.
TP23 Discriminator Voltage.
Nominally +2.5V with 6 dB noise at 128 Kbs.
TPG Ground test point
TP1 Q EYE pattern.
Level is 1V P-P at the center of the eye crossing. The DC offset is about +2.4V.
TP2 Q THRS - Q channel threshold voltage. +2.9V DC.
TP3 I THRS - I channel threshold voltage. +2.9V DC.
TP4 I EYE pattern.
Level is 1V P-P at the center of the eye crossing. The DC offset is about +2.4V.
TP5 Q CLK THRS +
Q channel + clock threshold. +2 to +3V DC.
TP6 Q CLK THRS -
Q channel - clock threshold. +2 to +3V DC.
TP7 I CLK THRS - I channel + clock threshold. +2 to +3V DC.
TP8 I CLK THRS +I channel - clock thr
eshold. +2 to +3V DC.
Figure 6-6
- 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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