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SDM-650B
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Comtech EF Data SDM-650B Specifications Page 147

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SDM-650B Satellite Modem Maintenance

Rev. 6 6–3

Refer to Figure 6-3 for a typical eye pattern with noise, and Figure 6-4 for a typical eye

pattern without noise.

Refer to Figure 6-5 for a typical eye constellation with noise, and Figure 6-6 for a typical

eye constellation without noise.

If the demodulator does not lock up, refer to the fault isolation in Section 6.2.2 to help

find the problem.

1 2 ... 142 143 144 145 146 147 148 149 150 151 152 ... 347 348

SDM-650B 1
Preface 5
Cautions and Warnings 6
Military Standards 7
Trademarks 7
Related Documents 7
European EMC Directive 8
Customer Support 9
Table of Contents 11
Rev. 5 ix 13
Rev. 5 xi 15
Rev. 5 xiii 17
Rev. 5 xv 19
Rev. 5 xvii 21
Figures 22
Rev. 5 xix 23
Chapter 1 25
INTRODUCTION 25
1.1 Purpose and Function 26
1.2 Description 27
1.3 System Specification 29
1–8 Rev. 5 32
Rev. 5 1–9 33
1–10 Rev. 5 34
Rev. 5 1–11 35
1–12 Rev. 5 36
Chapter 2 37
INSTALLATION 37
2.2 External Connections 38
2.2.1 DATA I/O 39
2.2.2 Remote (J6) 39
2.2.3 Fault (J7) 39
2.2.4 IF Output (CP1) 40
2.2.5 IF Input (CP2) 40
2.2.6 AC Power 40
2.2.7 GROUND 41
2.3 System Requirements 41
2.4 System Installation 42
Chapter 3 43
CONFIGURATION 43
3.1.1.1 Remote Interface 44
3.1.1.2 Remote Baud Rate 45
3.1.1.3 Remote Address 46
3.1.1.4 Battery 46
3.1.1.7 Utility Defaults 47
3–6 Rev. 5 48
3.2 Digital Interfaces 49
3–8 Rev. 5 50
Rev. 5 3–9 51
3–10 Rev. 5 52
3.2.1.2 Connector Pinouts 54
3.2.1.3 Specification 55
3.2.2 V.35 Interface 56
Rev. 5 3–15 57
3–16 Rev. 5 58
3.2.2.2 Connector Pinouts 60
3.2.2.3 Specification 61
SWITCH 1 62
Rev. 5 3–21 63
(See Note 1) 64
(See Note 2) 64
3.2.3.2 Connector Pinouts 65
3.2.3.3 Specification 65
Rev. 5 3–25 67
3.2.4.2 Optional EXT CLK 68
3.2.4.4 Connector Pinouts 69
3–28 Rev. 5 70
3.2.4.7 Send Data (J4) 72
3.2.4.8 Receive Data (J5) 72
3.2.4.9 Specification 73
Rev. 5 3–33 75
3.2.5.3 Multiplexer 77
3.2.5.4 Demultiplexer 77
3–36 Rev. 5 78
Rev. 5 3–39 81
3.3 Doppler Buffer 82
3–42 Rev. 5 84
Rev. 5 3–43 85
3.3.1 Buffer Setup 86
Rev. 5 3–45 87
3.3.1.1 Buffer Size 88
3.3.1.2 Doppler 88
3.3.1.3 Plesiochronous 89
3.3.1.5 Total Buffer Length 90
3.3.1.6 Converting 90
3.5 I/O Connectors 91
3.6.1 Master/Slave 92
3–52 Rev. 5 94
3.6.1.2 Master/Slave G.703 95
3.6.1.3 Master/Slave X.21 96
Rev. 5 3–55 97
3.6.2 Master/Master 98
• TX-CLOCK: EXT 99
3–58 Rev. 5 100
Rev. 5 3–59 101
3–60 Rev. 5 102
Chapter 4 103
OPERATION 103
4.1 Front Panel 104
4.1.1 LED Indicators 105
4.1.2 Controls 105
4–4 Rev. 5 106
[←] and [→] 106
Rev. 5 4–5 107
4.1.4 Menu Explanations 111
(Test Mode Configuration 112
Option) 112
↑] and [↓] to select 116
4.1.4.2 Select Monitor 117
4.1.4.3 Select Faults 118
4–18 Rev. 5 120
4.1.4.5 Select Utility 121
↑] and [↓] to change that 123
←] and [→] to see the 124
Chapter 5 125
THEORY OF OPERATION 125
5–2 Rev. 6 126
5.1.1 Specifications 127
5–4 Rev. 6 128
5.1.2 Theory of Operation 129
5–6 Rev. 6 130
Rev. 6 5–7 131
5.2.1 Specification 132
5.2.2 Theory of Operation 133
5.2.2.2 Sequential Decoder 134
Rev. 6 5–11 135
5–12 Rev. 6 136
Rev. 6 5–13 137
5–14 Rev. 6 138
Rev. 6 5–15 139
5.3 Demodulator 140
5.3.1 Specifications 141
5.3.2 Theory of Operation 141
5.4.1 Reacquisition 142
5.4.2 Fast Acquisition 143
5.4.3 Directed Sweep 144
Chapter 6 145
MAINTENANCE 145
6.1.2 Demodulator 146
Rev. 6 6–3 147
6–4 Rev. 6 148
Various Code Rates 149
6–6 Rev. 6 150
Rev. 6 6–7 151
6.1.3 Test Points 152
6.1.3.1 Modulator 152
6.1.3.2 Demodulator 153
6.2 Fault Isolation 155
Rev. 6 6–17 161
6–18 Rev. 6 162
Rev. 6 6–19 163
6–20 Rev. 6 164
6.4 Module Replacement 165
6.5 Module Identification 165
Appendix A 167
DATA RATES AND FILTERS 167
A–2 Rev. 6 168
Rev. 6 A–3 169
A–4 Rev. 6 170
A.2 Variable Rate Filters 172
←] and [→] to move 174
A.2.3 Utility 175
←] and [→] 176
Appendix B 177
REMOTE CONTROL OPERATION 177
B.1.1 General 178
B.1.2 Message Structure 178
B.1.2.1 Start Character 178
B.1.2.2 Device Address 179
B.1.2.3 Command/Response 180
B.1.2.4 End Character 180
B.1.3.1 Remote 181
B.1.3.3 Set RF Output 181
B.1.3.7 Modulator Rate 183
B.1.3.8 Demodulator Rate 185
B.1.3.9 Scrambler Enable 186
B.1.3.10 Descrambler Enable 186
B.1.3.12 Transmit Clock 187
B.1.3.13 Receive Clock 187
B.1.3.14 Baseband Loopback 187
B.1.3.15 RF Loopback 188
B.1.3.16 IF Loopback 188
B.1.3.17 Time of Day 188
B.1.3.18 Date 189
B.1.3.20 BER Threshold 189
B.1.3.22.3 Sweep Direction 192
B.1.3.24.1 Buffer Clock 193
B.1.4.1 Configuration 194
B.1.4.3 Modulator Status 197
B.1.4.4 Demodulator Status 197
B.1.4.7 BER Status 199
B.1.4.7.1 Raw BER 199
B.1.4.7.2 Corrected BER 199
B.1.4.8 E 200
Status 200
B.1.4.13 Stored Faults 202
B.1.4.17 Change Status 207
B.1.4.18 Equipment Type 208
B.2.1 General 209
B.2.2 Message Structure 209
B.2.2.1 Start Character 210
B.2.2.2 Device Address 210
B.2.2.3 Command/Response 211
B.2.2.4 End Character 211
B.2.3.2 Set RF Output 212
B.2.3.5 Modulator Rate 214
B.2.3.6 Scrambler Enable 215
B.2.4.2 Demodulator Rate 216
B.2.4.3 Descramble Enable 218
B.2.4.4 RF Loopback 218
B.2.4.5 IF Loopback 218
B.2.4.6 BER Threshold 218
B.2.4.7 Sweep Reacquisition 219
B.2.4.8.2 Sweep Width Range 220
B.2.4.8.3 Sweep Direction 221
B.2.5.1 Transmit Clock 221
B.2.5.2 Buffer Clock 221
B.2.5.3 Receive Clock 222
B.2.5.5 Interface Loopback 222
B.2.5.6 Baseband Loopback 222
B.2.6.1 Time of Day 225
B.2.6.2 Date 226
B.2.6.3 Remote 226
B.2.6.4 Clear Stored Faults 226
B.2.7.1.1 Local AUPC Enable 227
Pattern) 230
Modulator/Coder 231
B.2.8.3 Modulator Status 236
B.2.8.4 Demodulator Status 236
B.2.8.8.1 Raw BER 238
B.2.8.8.2 Corrected BER 238
B.2.8.9 E 239
B.2.8.10 Modulator Rate 239
B.2.8.11 Demodulator Rate 239
B.2.8.16 Stored Faults 241
B.2.8.20 Change Status 248
B.2.8.21 Equipment Type 248
Appendix C 249
FIELD COMPATIBILITY 249
Appendix D 251
SOFTWARE CHANGE 251
INSTRUCTIONS 251
Appendix E 253
AGC INTERFACE 253
E.1 Connector Pinouts 254
E.2.1 Parts Required 254
Ω between U1 pin 1 and 255
Figure E-2. Wiring Diagram 256
Rev. 5 E–5 257
E–6 Rev. 5 258
Appendix F 259
ASYNCHRONOUS OVERHEAD 259
CHANNEL UNIT 259
F–2 Rev. 5 260
RECEIVE SECTION 261
TRANSMIT SECTION 261
F.1.1 Terrestrial Interface 262
F.1.2 Multiplexer 264
F.1.3 Demultiplexer 264
F.1.4 Plesiochronous Buffer 265
F.4.1 AUPC 268
Rev. 5 F–11 269
F.5 Front Panel Operation 270
F.5.2 Menu Explanations 278
Refer to Table F-4 279
to move the flashing 279
Refer to Table F-5 281
Refer to Table F-6 283
Refer to Table F-7 286
F.5.2.2 Select Monitor 287
F.5.2.3 Select Faults 288
F.5.2.5 Select Remote 292
F.5.2.5.2 Remote Monitor 292
F.5.2.6 Select Utility 293
F–38 Rev. 5 296
Appendix G 297
TROJAN INTERFACE 297
G–2 Rev. 5 298
G–4 Rev. 5 300
G.2 Connector Pinouts 301
G.3 Specification 302
G.4 Configuration Guide 303
G.4.3 Interface Defaults 304
G.5 Front Panel Operation 305
G–10 Rev. 5 306
G.5.2.5 Select Utility 311
G.6.1 General 312
G.6.1.1 Message Structure 312
G.6.1.1.1 Start Character 313
G.6.1.1.2 Device Address 313
G.6.2 Command/Response 314
G.6.3 End Character 314
G.6.4.1 Modulator 315
G.6.4.1.2 Set RF Output 315
G.6.4.1.3 Modulator Rate 316
G.6.4.2 Demodulator 319
G.6.4.2.2 Demodulator Rate 319
G.6.4.2.3 Descramble Enable 321
G.6.4.2.4 IF Loopback 321
G.6.4.2.5 RF Loopback 321
G.6.4.2.9 Sweep Width Range 323
G.6.4.2.10 Sweep Direction 323
G.6.4.3.1 Baseband Loopback 324
G.6.4.3.2 Transmit Clock 324
G.6.4.3.3 Receive Clock 324
G.6.4.4.1 Time of Day 326
G.6.4.4.2 Date 326
G.6.4.4.3 Remote 327
G.6.4.5.1 Configuration 328
G.6.4.5.3 Modulator Status 331
G.6.4.5.6.1 Raw BER 332
G.6.4.5.6.2 Corrected BER 333
G.6.4.5.7 E 333
G.6.4.5.8 Modulator Rate 333
G.6.4.5.9 Demodulator Rate 334
G.6.4.5.12 Stored Faults 334
“FAM_” command definition 337
G.6.4.5.16 Change Status 339
G.6.4.5.17 Equipment Type 340
Glossary 341
OSC Oscillator 344
METRIC CONVERSIONS 347
Units of Length 347
Temperature Conversions 347
Units of Weight 347
480 • 333 • 2200 PHONE 348
480 • 333 • 2161 348

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