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SDM-300L3 Satellite Modem Revision 0
Forward Error Correction Options MN/SDM300L3.IOM
7–6
CAUTION
Comtech EF Data strongly cautions users when using uncoded operation. If
the acquisition sweep width exceeds one quarter of the symbol rate, there is a
very high probability that the demodulator will false lock.
As an example, if 64 kbps QPSK uncoded is used, the symbol rate will be half of this rate, or 32
ksymbols/second. One quarter of this equals 8 kHz. Therefore, the absolute maximum
acquisition sweep range, which should be considered, is ± 8 kHz. If there is any frequency
uncertainty on the incoming carrier, this should be subtracted from the sweep width. The
problem becomes progressively better with increasing symbol rate.
CAUTION
Comtech EF Data is not responsible for incorrect operation if the user does
not adhere to these guidelines when using uncoded operation.
- Satellite Modem 1
- Installation and O 1
- Errata A 3
- Filename: T_ERRATA 2 4
- Errata B 5
- Errata C 7
- Change Specifics: 8
- Errata D 9
- Errata E 11
- Dual: dual sideband 12
- Errata F 13
- 3.2.10 AC Power Connector 14
- Errata G 15
- Errata H 17
- Errata J 19
- Errata K 21
- Errata L 23
- Errata M 25
- Errata N 27
- SDM-300L3 29
- Customer Support 30
- Table of Contents 31
- Preface MN/SDM300L3.IOM 32
- Figures 39
- About this Manual 42
- Related Documents 42
- Conventions and References 42
- Cautions and Warnings 42
- Metric Conversion 43
- Trademarks 43
- ELECTRICAL SAFETY 44
- Installation 45
- Warranty Policy 47
- Limitations of Warranty 47
- Exclusive Remedies 47
- Disclaimer 47
- Chapter 1. INTRODUCTION 49
- SDM-300L Satellite Modem 50
- 1.1 Overview 51
- 1.2 Options Summary 51
- 1.5 Compatibility 54
- 1.6.1 Overview 54
- 1.6.2 Description 54
- 1.6.4 BPSK Encoding 56
- 1.6.5 QPSK Encoding 56
- 1.6.6 OQPSK Encoding 57
- 1.6.7 8PSK Encoding 57
- 1.7.1 Overview 58
- 1.8.1 Overview 60
- . M&C Block Diagram 61
- 1.9 Dimensional Envelope 63
- 2.0 INSTALLATION/ 65
- UPGRADES 65
- 2.2 Installation 66
- 2.3.1.1 Installation 68
- Overhead 69
- 2.3.2 Reed-Solomon PCB 70
- 2.3.2.1 Unpacking 70
- 2.3.2.2 Installation 70
- Reed-Solomon 71
- Cards (TX or RX in 71
- Either Slot) 71
- 2.3.3.1 Unpacking 72
- 2.3.3.2 Installation 72
- 2.4.1 G.703/ASYNC Module 76
- 2.5 Hardware Upgrades 78
- 2.6 Flash Upgrading 80
- Chapter 3. CONNECTOR PINOUTS 83
- J2 J3 J4 J5 84
- Chapter 4. FRONT PANEL 97
- 4.2 LED Indicators 98
- 4.3 Front Panel Keypad 99
- 4.4 Menu System 100
- 4.4.5 REVISION EMULATION 101
- 4.5 Menu Tree 102
- SDM-300L3 CUSTOM 103
- VER: X.X.X 103
- FUNCTIONAL SELECT 103
- CONFIGURATION 103
- TX-X CODE/DATA RATE 104
- TX-IF FREQUENCY 106
- 1200.0000 MHz 106
- TX TERMINAL FREQUENCY 106
- 5845.0000 MHz 106
- ↑] and [↓] with 107
- SCRAMBLER 108
- DIFF. ENCODER 108
- CARRIER MODE 109
- MODEM REFERENCE 109
- ODU OUTPUT DELAY 111
- ODU 10 MHZ REF 111
- RS ENCODER (CONDITIONAL) 112
- RX-X CODE/DATA RATE 112
- IMPORTANT 114
- DESCRAMBLER 115
- DIFF. DECODER 115
- RF LOOP BACK 116
- IF LOOP BACK 117
- RS DECODER 121
- TX CLOCK SOURCE 122
- TX CLOCK PHASE 123
- EXT-CLK FREQ 123
- BUFFER CLOCK 124
- RX CLOCK PHASE 124
- B-BAND LOOP BACK 125
- INTRFC LOOP BACK 126
- BUFFER SIZE (CONDITIONAL) 127
- PCB is installed 128
- RX DATA FAULT 129
- TX 2047 PATTERN 129
- RX 2047 PATTERN 130
- TX CODING FORMAT 130
- DROP FORMAT 133
- INSERT FORMAT 134
- Card is installed 135
- Overhead Card is installed 136
- (CONDITIONAL) 141
- TRACKING RATE (CONDITIONAL) 144
- REMOTE CL ACTION 145
- ↑] or [↓]. Press 146
- (OPTIONAL) (CONDITIONAL) 151
- (CONDITIONAL) 154
- TX INTERFACE 156
- 156
- RX INTERFACE 157
- OUTDOOR UNIT 159
- FUNCTION SELECT 160
- STORED FLTS/ALMS 160
- AUPC ENABLE (CONDITIONAL) 166
- 2047 ERRORS 168
- ASSIGN TRANSMIT FILTERS 170
- TX TERMINAL LO 172
- 0 MHz MIX: 172
- MOD POWER OFFSET 173
- MODULATOR TYPE 173
- SCRAMBLER TYPE 174
- ODU ALARM - LOW 176
- ODU ALARM - HIGH 177
- RF MODE CONTROL 177
- ASSIGN RECEIVE FILTERS 179
- RX TERMINAL LO 180
- RX TERMINAL LO 181
- O MHz MIX: 181
- TX OVERHEAD TYPE 186
- RX OVERHEAD TYPE 186
- IDR BACKWARD 191
- ALARM CONTROL 191
- MASTER RESET 203
- HARD/SOFT 203
- UTILITY 204
- MODEM TYPE 204
- MODEM TYPE 204
- MODEM OPTIONS 205
- CARD #1 TYPE 206
- OVERHEAD 01 206
- CARD #2 TYPE 206
- REED SOLOMON 03 206
- CARD #3 TYPE 207
- REED SOLOMON 02 207
- CARD #1 OPTIONS 207
- CARD #2 OPTIONS 208
- CARD #3 OPTIONS 208
- LOCAL MODEM AUPC 209
- MODEM SERIAL # 209
- 012345678 209
- Chapter 5. MODEM TYPE 217
- 5.2 IDR Operation 218
- 5.3 IBS Operation 219
- 5.3.1 309 IBS Operation 219
- 5.3.2 VSAT IBS Operation 219
- 5.4 D&I Operation 220
- 5.5 ASYNC/AUPC Operation 221
- Modem Types MN/SDM300L3.IOM 222
- 5.7 Custom Operation 224
- 5.8 Reed-Solomon Modes 225
- Chapter 6. CLOCKING AND RX 227
- BUFFERING SETTINGS 227
- Figure 6-1 230
- RECOVERY 232
- RX CLOCK = INSERT 234
- 6.3 Buffering 235
- FIGURE 6-6. CLOCK SLIP 236
- FIGURE 6-7. DOPPLER SHIFT 237
- 6.3.1 Buffer Size 238
- 6.4 Doppler 238
- 6.5 Plesiochronous 239
- 6.6 Frame/Multiframe Length 240
- 6.6.2 Total Buffer Length 240
- CHAPTER 7. FEC AND TURBO 241
- 7.2 Coding 242
- 7.3.1 Introduction 242
- Figure 7-1. Viterbi Decoder 247
- Eb/No (dB) 248
- UNCODED 1:1 BPSK OQPSK 249
- Chapter 8. SYSTEM CHECKOUT 255
- 8.1.1 Interface Checkout 256
- 8.1.2 Modulator Checkout 257
- WITH NOISE 260
- WITHOUT NOISE 260
- Chapter 9. FAULT ISOLATION 261
- 9.1.1 System Faults/Alarms 262
- 9.1.3.1 Faults Tree 263
- 9.1.3.2 Modulator Faults 266
- 9.1.3.3 Demodulator Faults 267
- 9.1.3.4 Outdoor Unit 268
- Chapter 10. OPEN NETWORK 271
- OPERATIONS 271
- 10.2.1 IBS Modem Defaults 274
- 10.3 IDR 275
- 0 dB V.35 Scrambler ON 278
- 10.4.1.1 Data Interface 281
- 10.4.1.2 Transmit MUX 281
- 10.4.1.3 Receive DEMUX 282
- 10.4.1.6 Backward Alarm 283
- follows: 284
- . D&I Modem Faults 287
- Chapter 11. ASYNCHRONOUS 289
- INTERFACE/AUPC 289
- . ASYNC/AUPC Block Diagram 291
- 11.2 AUPC 292
- TX and RX Reed-Solomon 293
- 11.2.1.1 Remote AUPC 294
- 11.3 ASYNC 295
- 11.3.3 MUX Operation 296
- 11.3.4 DEMUX Operation 296
- 11.3.5 Buffer Operation 296
- 11.3.8 Non-ASYNC Operation 298
- ASYNC REMOTE OPERATION 300
- LOCAL END REMOTE END 301
- EIA-485 [4-Wire]) 306
- [2-Wire]) 307
- [4-Wire]) 310
- CHAPTER 12. ASYMMETRICAL 313
- LOOP TIMING 313
- Chapter 13. G.703 317
- G.703 MN/SDM300L3.IOM 318
- CHAPTER 14. FULLY 319
- ACCESSIBLE SYSTEM 319
- TOPOLOGY (FAST) 319
- Select Features: 320
- Options MN/SDM300L3.IOM 321
- Verify Upgrade 322
- CHAPTER 15 . SPECIFICATIONS 323
- Figure 15-1. Block Diagram 324
- 15.2 Specification Summary 325
- 15.5.1 Digital Data Rate 328
- Capacitively coupled 331
- -63.0 100 Hz 332
- -73.0 1 kHz 332
- -83.0 10 kHz 332
- -93.0 100 kHz 332
- ≤ -25 dBc and carrier 334
- 15.6 Encoding 335
- 15.6.1 BPSK Encoding 335
- 15.6.1 QPSK Encoding 335
- 15.6.2 OQPSK Encoding 336
- 15.6.3 8PSK Encoding 336
- 15.7.1 Digital Data Rate 337
- 15.7.3 Descrambling Types 340
- 15.7.5 BPSK Bit Ordering 340
- 300L_levels.xls 343
- (Optional) 344
- Reed Solomon(Optional) 345
- (Optional) 346
- 15.8.8 BER Threshold 346
- 15.9 Acquisition Time 347
- 15.9.3 AGC Output 348
- 15.10.13 Switch Faults 351
- 15.11 Decoding 351
- 15.11.1 BPSK Decoding 351
- 15.11.2 QPSK Decoding 351
- 15.11.4 8PSK Decoding 352
- 15.13.5 Turbo AUPC 358
- 15.14.3 IBS Framing 358
- 15.14.5 IBS Scrambling 359
- 15.15.2 D&I Framing 360
- 15.16.2 IDR Framing 361
- 15.17 System Specifications 362
- 15.17.1 Loopback Modes 362
- 15.17.2 Test Modes 362
- 15.17.3 Remote Control 363
- 15.17.5 Monitored Signals 363
- 15.18 Stored Faults 364
- 15.19 Stored Configurations 364
- 15.20 Interoperability Modes 364
- Chapter 16. BUC FSK 365
- COMMUNICATIONS 365
- 16.2 Message Structure 366
- 16.3 Power Class 367
- Appendix A. REMOTE CONTROL 369
- OPERATION 369
- A.2 Message Structure 370
- A.2.1 Start Character 370
- A.2.2 Device Address 370
- A.2.3 Command/Response 371
- A.2.4 End Character 372
- Command: 373
- (MPO_) 374
- Modulator Output Power 385
- AUPC Local Power Enable 386
- A.4.4 Fault Status 392
- A.4.5 Error Performance 393
- A.5 Stored Faults 396
- Glossary 413
- Glossary MN/SDM300L3.IOM 416
- Coding, 7-2 417
- Modulator:MOD Spectrum, 4-79 420
- Collating Instructions 424
- Appendix B. Burst Mode 425
- Modulator Operation 425
- B.2.1 Digital Data Rate 426
- Capacitively coupled 427
- B.2.8 Phase Noise 428
- B.2.10 Transmit IF Power 428
- B.2.13 Spurious Emissions 429
- B.2.17 Transmit Preamble 430
- B.2.18 Transmit Packet 430
- B.2.19 Transmit Postamble 430
- METRIC CONVERSIONS 433
- Units of Length 433
- Temperature Conversions 433
- Units of Weight 433
- 480 • 333 • 2200 PHONE 434
- 480 • 333 • 2161 434
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