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DMD50 Universal Satellite Modem Maintenance and Troubleshooting
TM118 – Rev. 1.1 6-7
6.1.2.3 Backward Alarms
Backward Alarms are alarms that are fed back to or received from the other end of the satellite
link. In IBS Mode (including Drop & Insert), Backward Alarm 1 is the only one used. It would be
received if the distant end demod drops lock.
6.2 IBS Fault Conditions and Actions
Figure 6-10 and Table 6-1 illustrate the IBS Fault Conditions and Actions to be taken at the Earth
Station, at the Terrestrial Data Stream, and the Satellite. These faults include those detected on
the Terrestrial link and those detected from the satellite.
Figure 6-1. IBS Alarm Concept
- Universal Satellite Modem 1
- Warranty Policy 4
- Preface 6
- Trademarks 7
- Copyright 7
- Disclaimer 7
- Record of Revisions 7
- Table of Contents 8
- TM118 – Rev. 1.1 ix 10
- TM118 – Rev. 1.1 xi 12
- TM118 – Rev. 1.1 xiii 14
- TM118 – Rev. 1.1 xv 16
- Introduction 18
- 1-2 TM118 – Rev. 1.1 19
- TM118 – Rev. 1.1 1-3 20
- Installation 22
- 2.1 Unpacking 23
- 2.2 Removal and Assembly 23
- 2.3 Mounting Considerations 24
- 2-4 TM118 – Rev. 1.1 25
- 2.5 Modulator Checkout 26
- 2.5.1 Initial Power-Up 26
- 2.6 Storage 26
- 2-6 TM118 – Rev. 1.1 27
- Theory of Operation 28
- 3-2 TM118 – Rev. 1.1 29
- 3.1.1 Front Panel 31
- 3.1.2 Baseband Processing 31
- 3.2.1 Terminal Port 33
- 3.2.3 Ethernet M&C Port 33
- 3.2.4 Modem Monitor Status 33
- 3.4 Internal Clock 34
- TM118 – Rev. 1.1 3-9 36
- 3-10 TM118 – Rev. 1.1 37
- 3.6 Clocking Options 38
- 3.6.1 TX Clock Options 38
- TM118 – Rev. 1.1 3-13 40
- 3-14 TM118 – Rev. 1.1 41
- TM118 – Rev. 1.1 3-15 42
- 3-16 TM118 – Rev. 1.1 43
- TM118 – Rev. 1.1 3-17 44
- 3-18 TM118 – Rev. 1.1 45
- TM118 – Rev. 1.1 3-19 46
- 3.12 ESC Backward Alarms 47
- TM118 – Rev. 1.1 3-21 48
- 3.13.2 Aggregate Data Rate 49
- (less than In-Band Rate) 50
- 3-24 TM118 – Rev. 1.1 51
- 3.16 Strap Codes 52
- 3-26 TM118 – Rev. 1.1 53
- User Interfaces 54
- 4.1.3 Numeric Keypad 55
- 4.2 Parameter Setup 56
- 4.3.1 Main Menus 57
- TM118 – Rev. 1.1 4-5 58
- 4-6 TM118 – Rev. 1.1 59
- TM118 – Rev. 1.1 4-7 60
- 4-8 TM118 – Rev. 1.1 61
- TM118 – Rev. 1.1 4-9 62
- 4-10 TM118 – Rev. 1.1 63
- TM118 – Rev. 1.1 4-11 64
- 4-12 TM118 – Rev. 1.1 65
- TM118 – Rev. 1.1 4-13 66
- 4-14 TM118 – Rev. 1.1 67
- TM118 – Rev. 1.1 4-15 68
- 4-16 TM118 – Rev. 1.1 69
- TM118 – Rev. 1.1 4-17 70
- Only these will 71
- Will not be 71
- 4>3 and 5>3 71
- TM118 – Rev. 1.1 4-19 72
- 4-20 TM118 – Rev. 1.1 73
- TM118 – Rev. 1.1 4-21 74
- 4-22 TM118 – Rev. 1.1 75
- TM118 – Rev. 1.1 4-23 76
- 4-24 TM118 – Rev. 1.1 77
- TM118 – Rev. 1.1 4-25 78
- 4-26 TM118 – Rev. 1.1 79
- TM118 – Rev. 1.1 4-27 80
- 4-28 TM118 – Rev. 1.1 81
- TM118 – Rev. 1.1 4-29 82
- distant satellite end 83
- TM118 – Rev. 1.1 4-31 84
- 4-32 TM118 – Rev. 1.1 85
- TM118 – Rev. 1.1 4-33 86
- 4-34 TM118 – Rev. 1.1 87
- TM118 – Rev. 1.1 4-35 88
- 4-36 TM118 – Rev. 1.1 89
- TM118 – Rev. 1.1 4-37 90
- 4-38 TM118 – Rev. 1.1 91
- TM118 – Rev. 1.1 4-39 92
- 4-40 TM118 – Rev. 1.1 93
- 4.4 Terminal Mode Control 94
- 4.6 Connecting the Terminal 95
- 4.7 Terminal Screens 95
- 4.8.1 Protocol Structure 96
- 4-44 TM118 – Rev. 1.1 97
- Rear Panel Interfaces 98
- 5-2 TM118 – Rev. 1.1 99
- 5.3.5 RX L-Band IF (J14) 100
- 5.3.6 ALARM (J15) 100
- 5.3.7 EXT CLK (J16) 100
- 5.3.8 ASYNC (J17) 101
- 5.3.9 J18 101
- 5.3.10 EIA-530 (J19) 101
- 5.3.11 REMOTE (J20) 102
- 5.3.12 ETHERNET (J21) 103
- 5.4.1 ESC ALARM (J1) 103
- 5.4.2 64K AUDIO (J2) 104
- 5.4.3 8K DATA (J3) 105
- 5.4.4 G.703 BAL (J4) 105
- 5.4.5 SWITCH INTERFACE (J5) 106
- 5-10 TM118 – Rev. 1.1 107
- TM118 – Rev. 1.1 5-11 108
- 5.4.6 SD (DDI) (J6) 109
- 5.4.7 DDO (J7) 109
- 5.4.8 IDI (J8) 109
- 5.4.9 SD (IDO) (J9) 109
- 5.6.1 HSSI (J6) 110
- 5.7.1 ASI IN (J1) 111
- 5.7.2 ASI OUT (J2) 111
- 5.7.3 DVB/M2P IN (J3) 111
- TM118 – Rev. 1.1 5-15 112
- 5.7.4 DVB/M2P OUT (J4) 113
- TM118 – Rev. 1.1 5-17 114
- 5.9 HSSI / G.703 115
- 5.9.1 64K AUDIO (J2) 116
- 5.9.2 8K DATA (J3) 117
- 5.9.3 G.703 BAL (J4) 118
- 5.9.4 ESC ALARM (J5) 119
- 5.9.5 SD (DDI) (J6) 119
- 5.9.6 DDO (J7) 119
- 5.9.7 IDI (J8) 120
- 5.9.8 SD (IDO) (J9) 120
- 5.10 HSSI / Ethernet (J1) 120
- 5.12 GigE Interface 121
- TM118 – Rev. 1.1 5-25 122
- 6.0 Periodic Maintenance 124
- 6.0.1 Clock Adjustment 124
- 6.1 Troubleshooting 124
- 6.1.1 Alarm Faults 125
- 6.1.1.1 Major Tx Alarms 125
- 6.1.1.2 Major Rx Alarms 126
- 6.1.1.3 Minor Tx Alarms 126
- 6.1.1.4 Minor Rx Alarms 127
- 6.1.1.6 Common Major Alarms 128
- 6-6 TM118 – Rev. 1.1 129
- 6.1.2.3 Backward Alarms 130
- 6-8 TM118 – Rev. 1.1 131
- TM118 – Rev. 1.1 6-9 132
- Technical Specifications 134
- 7.2 Demodulator 135
- 7.3 Plesiochronous Buffer 135
- 7.4 Monitor and Control 135
- TM118 – Rev. 1.1 7-3 136
- 7-4 TM118 – Rev. 1.1 137
- 7.18 Data Rate Limits 138
- 7.18.1 Non-DVB 138
- 7.18.2 DVB 139
- TM118 – Rev. 1.1 7-7 140
- Viterbi 141
- Sequential 142
- Viterbi Decoder 143
- Reed Solomon 143
- Turbo Decoder 144
- 7-12 TM118 – Rev. 1.1 145
- Trellis 147
- TM118 – Rev. 1.1 7-15 148
- 7-20 TM118 – Rev. 1.1 153
- TM118 – Rev. 1.1 7-21 154
- 7-22 TM118 – Rev. 1.1 155
- TM118 – Rev. 1.1 7-23 156
- 7.18.13 AGC Output Voltage 157
- TM118 – Rev. 1.1 7-25 158
- Product Options 160
- TM118 – Rev. 1.1 A-3 162
- B.0 Introduction 164
- B.1 Required Equipment 164
- B.2 Upgrade Procedure 164
- B-2 TM118 – Rev. 1.1 165
- B.3 Demonstration Procedure 166
- B-4 TM118 – Rev. 1.1 167
- TM118 – Rev. 1.1 168
- B-6 TM118 – Rev. 1.1 169
- Carrier Control 172
- C.5 Carrier RTS 173
- TM118 – Rev. 1.1 C-3 174
- Strap Codes 176
- D.1 Sample Applications 179
- TM118 – Rev. 1.1 D-5 180
- D-6 TM118 – Rev. 1.1 181
- TM118 – Rev. 1.1 D-7 182
- Case 4: Loop Timing Example 183
- TM118 – Rev. 1.1 D-9 184
- TCP/IP Ethernet Setup 186
- E.3 Ethernet Test 188
- Network) 188
- E-4 TM118 – Rev. 1.1 189
- TM118 – Rev. 1.1 E-5 190
- E-6 TM118 – Rev. 1.1 191
- TM118 – Rev. 1.1 E-7 192
- Web Browser Setup Guide 194
- F-2 TM118 – Rev. 1.1 195
- TM118 – Rev. 1.1 F-3 196
- F.2 Modem Web Site 197
- F.3 Web Page Appearance 198
- F-6 TM118 – Rev. 1.1 199
- TM118 – Rev. 1.1 F-7 200
- AUPC Operation 202
- G-2 TM118 – Rev. 1.1 203
- TM118 – Rev. 1.1 G-3 204
- G-4 TM118 – Rev. 1.1 205
- Drop and Insert (D&I) 206
- H-2 TM118 – Rev. 1.1 207
- H.0.1 Drop Only 208
- H.0.2 Insert Only 208
- H-4 TM118 – Rev. 1.1 209
- H.0.3 Mode Selection 210
- H.0.3.1 PCM-30 210
- H.0.3.2 PCM-30C 210
- H.0.3.3 PCM-31 210
- H.0.3.4 PCM-31C 210
- H.0.3.5 T1-D4/T1-D4-S 211
- H.0.3.6 T1-ESF/T1-ESF-S 211
- TM118 – Rev. 1.1 H-7 212
- H-8 TM118 – Rev. 1.1 213
- H.1.1 Data Rate 214
- H-10 TM118 – Rev. 1.1 215
- TM118 – Rev. 1.1 H-11 216
- H-12 TM118 – Rev. 1.1 217
- TM118 – Rev. 1.1 H-13 218
- H-14 TM118 – Rev. 1.1 219
- TM118 – Rev. 1.1 H-15 220
- H-16 TM118 – Rev. 1.1 221
- TM118 – Rev. 1.1 H-17 222
- H-18 TM118 – Rev. 1.1 223
- TM118 – Rev. 1.1 H-19 224
- Efficient Drop & Insert 226
- I-2 TM118 – Rev. 1.1 227
- TM118 – Rev. 1.1 I-3 228
- I-4 TM118 – Rev. 1.1 229
- TM118 – Rev. 1.1 I-5 230
- I-6 TM118 – Rev. 1.1 231
- Glossary 232
- J-2 TM118 – Rev. 1.1 233
- J-4 TM118 – Rev. 1.1 235
- J-6 TM118 – Rev. 1.1 237
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