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DMD2050E Universal Satellite Modem Theory of Operation
MN-DMD2050E Revision 2 3–56
3.12.2 TPC and LDPC Summary
FOR
AGAINST
Exceptionally good BER performance – significant improvement compared with every other
FEC method in use today.
Nothing!
Most modes have no pronounced threshold effect – fails gracefully.
Exceptional bandwidth efficiency .
Coding gain independent of data rate (in this implementation).
Low decoding delay for TPC.
Easy field upgrade in DMD2050E.
3.13 Reed-Solomon Codec
Utilizing a Reed-Solomon (R-S) Outer Codec concatenated with a Convolutional Inner Codec is
an effective way to produce very low error rates even for poor signal-to-noise ratios while
requiring only a small increase in transmission bandwidth. Typically, concatenating an R-S
Codec requires an increase in transmission bandwidth of only 9 – 12% while producing a greater
than 2 dB improvement in E
b
/N
o
. R-S is a block Codec where K data bytes are fed into the
encoder which adds 2t = (N – K) check bytes to produce an N byte R-S block. The R-S decoder
can then correct up to “t” erred bytes in the block.
See also:
Figure 3-20. Reed-Solomon Encoder Functional Block Diagram
Figure 3-21. Reed-Solomon Decoder Functional Block Diagram
Table 3-1. Spectral Efficiency using DoubleTalk Carrier-in-Carrier
3.13.1 Reed-Solomon Operation in the DMD2050E
When the Reed-Solomon Codec is enabled, data is fed to the R-S Encoding Section of the
DMD2050E where it is scrambled, formed into blocks, R-S encoded, and interleaved. Unique
words are added so that the blocks can be reformed in the Receiving Modem (see Figure 3-20
and Figure 3-21). Data is then sent to the modulator where it is convolutionally encoded,
modulated and transmitted to the satellite.
- DMD-2050E 1
- BLANK PAGE 10
- Table of Contents 11
- vii 15
- viii 16
- xii 20
- xiii 21
- xiv 22
- Figures 23
- xvi 24
- PREFACE 25
- Electrical Safety 26
- Battery 26
- Grounding 26
- Environmental 27
- Low Voltage Directive (LVD) 27
- CE Mark 28
- Preface MN-DMD2050E 29
- Chapter 1. Introduction 31
- 1.2 DMD2050E Configurations 32
- 1.2.1 Features 32
- 1.2.3 Bandwidth Compression 33
- 1.2.4 Interfaces 34
- 1.2.6 Compatibility 34
- 1.2.7 Physical Description 34
- Chapter 2. Installation 37
- 2.2 Installation Safety 38
- 2.3.1 Location 39
- 2.3.2 Airflow 39
- 2.3.3 Temperature 39
- 2.3.4 Electrical Power 39
- 2.3.5 Cables 40
- 2.5 Modulator Checkout 41
- 2.5.1 Initial Start Up 41
- 3.1 DMD2050E Hardware 43
- 3.2.1 Front Panel 47
- 3.2.2 Baseband Processing 47
- 3.2.6 Terminal Port 50
- 3.2.8 Ethernet M&C Port 51
- 3.2.9 Modem Monitor Status 51
- 3.3 Internal Clock 52
- 3.5.1 Clock Selection 55
- 3.5.2 TX Clock Options 56
- 3.5.3.1 RX SAT Clock 58
- Clock specification 59
- Frequency 1 MHz to 20 MHz 59
- 3.6 Transmit Timing Options 60
- 3.6.2 G.703 Interface 60
- 3.6.3 HSSI Interface 60
- 3.8 Ebem Framing Unit 62
- 3.8.2 Embedded Channel 62
- 3.9 STANAG Turbo Coding 62
- 3.10 FIPs TRANSEC Module 63
- 3.10.1.1 Key Agreement 63
- 3.10.1.2.1 Key Derivation 66
- DMD2050E 71
- DMD2050E CnC Module 71
- 3.11.6 Margin Requirements 77
- 3.11.15 Glossary 91
- 3.12.1 LDPC versus TPC 94
- 3.12.2 TPC and LDPC Summary 98
- 3.13 Reed-Solomon Codec 98
- 3.13.3 Interleaving 99
- Communications) 100
- 3.16 Standard IBS Mode 102
- 3.18 ESC Backward Alarms 103
- See also: 104
- 3.19.2 Aggregate Data Rate 106
- (less than In-Band Rate) 108
- Port labeled ASYNC (J17) 110
- Chapter 4. User Interfaces 113
- 4.2.2 Arrow Keys 114
- 4.2.3 Numeric Keys 114
- 4.2.4 LED Lights 115
- 4.3 Parameter Setup 116
- 4.3.1 Select a Parameter 116
- 4.4 Front Panel Main Menus 116
- 4.4.1.1 NETWORK SPEC (menu) 117
- 4.4.1.2 STRAP CODE 118
- 4.4.1.3 IF (menu) 118
- 4.4.1.4 DATA (menu) 118
- 4.4.1.5 REED-SOLOMON (menu) 121
- 4.4.1.6 AUPC (menu) 121
- 4.4.1.7 LOCAL AUPC (menu) 122
- 4.4.1.8 REMOTE AUPC (menu) 125
- 4.4.1.9 ITA (menu) 125
- 4.4.2.1 NETWORK SPEC (menu) 126
- 4.4.2.2 STRAP CODE 127
- 4.4.2.3 IF (menu) 127
- 4.4.2.4 DATA (menu) 128
- 4.4.2.5 REED-SOLOMON (menu) 129
- Hz) between the 130
- 4.4.3.1 TX SETUP (menu) 131
- 4.4.3.2 RX SETUP (menu) 134
- 4.4.3.3 GENERAL (menu) 136
- 4.4.4.1 LINK STATUS (menu) 137
- 4.4.4.2 VOLTAGES (menu) 139
- 4.4.4.3 CnC (menu) 139
- 4.4.4.4 ITA (menu) 139
- 4.4.6.1 FRONT PANEL (menu) 140
- 4.4.6.2 REMOTE CONTROL 140
- 4.4.6.3 TERMINAL (menu) 141
- 4.4.6.4 REMOTE PORT (menu) 141
- 4.4.6.5 TCP/IP (menu) 141
- 4.4.6.6 SNMP (menu) 143
- 4.4.6.7 FTP (menu) 144
- 4.4.6.8 WEB (menu) 144
- 4.4.6.9 TRANSEC (menu) 145
- 4.4.6.10.2 FEATURES (menu) 147
- 4.5 Terminal Mode Control 150
- 4.5.1 Terminal Mode Screens 150
- 5.1.1 Ground Connector 154
- 5.1.2 Power Switch 154
- 5.2 Front Panel Connections 155
- 5.2.1 Key Loader Interface 155
- 5.3 Rear Panel Connectors 156
- 5.3.2 EXT REF (J10) 157
- 5.3.4 ALARM (J15) 158
- 5.3.5 EXT CLK (J16) 159
- 5.3.6 ASYNC (J17) 160
- 5.3.8 MIL-188-114A (J19) 161
- Chapter 6. Maintenance and 163
- Troubleshooting 163
- 6.2 Troubleshooting 164
- 6.3 Alarms 165
- 6.3.2 Major Rx Alarms 165
- 6.3.3 Minor Tx Alarms 166
- 6.3.3.1 Minor Rx Alarms 167
- 6.4 Alarm Masks 170
- 6.4.1 Active Alarms 170
- 6.4.1.1 Major Alarms 170
- 6.4.1.2 Minor Alarms 170
- 6.4.3 Latched Alarms 171
- 6.4.4 Backward Alarms 173
- 6.5 IBS Alarms and Actions 174
- 7.1 Modulator 175
- 7.2 Demodulator 176
- 7.3 Plesiochronous Buffer 177
- 7.4 Monitor and Control 177
- 7.11 Data Rate Limits 179
- 7.11.1 Non-DVB 179
- 7.11.2 DVB 181
- 7.12 BER Specifications 183
- Sequential 184
- 184
- Viterbi Decoder Reed 185
- Turbo Decoder 186
- Trellis 187
- Viterbi 189
- Viterbi Decoder 190
- Reed Solomon 190
- LDPC Decoder 196
- MILSTD 188-165B 200
- MILSTD 188 201
- 7.13 AGC Output Voltage 208
- Appendix A. Product Options 209
- B.1 Introduction 211
- B.2 Required Equipment 211
- B.3 Procedures 211
- B.3.2 Record the Unit ID 213
- B.3.4 Install the Code 214
- Appendix C. Carrier Control 217
- C.3 Carrier States 218
- C.3.1 Carrier OFF 218
- C.3.2 Carrier ON 218
- C.3.3 Carrier AUTO 218
- C.3.4 Carrier VSAT 219
- C.3.5 CARRIER RTS 219
- Appendix D. Web Interface 221
- Setup Guide 221
- D.2.2 IP Address 222
- D.3 Web Interface Security 222
- D.3.1 Default User Accounts 222
- D.3.2 User Account Data 223
- D.1 User Account Setup 223
- D.1.1 Edit the User ID 224
- D.1.2 Edit the Access Group 224
- D.2 Reset a User Account 225
- D.3 Confirmation 225
- D.4 Equipment Website 226
- D.5 Web Page Appearance 228
- D.6.3.1 Change the encoding 233
- D.6.4.4 Change the encoding 238
- D.6.5.2 Change the encoding 241
- E.1 Introduction 243
- E.2 System Requirements 243
- E.3 Configuration Examples 244
- Figure E-1. Looped Modems 245
- E.4 Functional Descriptions 246
- E.4.1 Drop Only 246
- E.4.2 Insert Only 246
- E.4.3 Data Formats 248
- E.4.3.1 PCM-30 248
- E.4.3.2 PCM-30C 248
- E.4.3.3 PCM-31 248
- E.4.3.4 PCM-31C 249
- E.4.3.5 T1-D4/T1-D4-S 249
- E.4.3.6 T1-ESF/T1-ESF-S 249
- E.5.1 Data Rate 253
- Example 1: 255
- Example 2: 257
- E.8 Prerequisite 266
- F.1 Introduction 271
- F.4 Ethernet Test 274
- Network) 274
- Appendix G. AUPC Operation 279
- G.1.2 EF AUPC 280
- G.1.3 Near Side AUPC 280
- G.1.4 EBEM AUPC 281
- Appendix H. Ethernet Data 283
- Interface Setup 283
- H.1.1 Ethernet Flow Control 284
- H.1.2 Ethernet Daisy Chain 284
- H.1.3 Ethernet QOS Type 285
- H.1.4 Ethernet QOS Queue 285
- H.1.6 Packet Statistics 287
- Appendix I. Strap Codes 289
- I.2 Sample Applications 294
- Appendix J. ITA Operation 303
- J.1.2 Basic Setup (Example) 305
- Table J-3 - ITA Setup 313
- TRANSEC Module 333
- 480 • 333 • 2200 PHONE 342
- • 333 • 2161 FAX 342
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