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CDM-Qx Satellite Modem Revision 5
Automatic Uplink Power Control (AUPC) MN/CDMQx.IOM
8–3
8.2.3 Alarm
This parameter defines how the user wants the modem to act if, under AUPC control, the
maximum power limit is reached.
The two choices are:
• NONE (no action)
• TX ALARM (generate a Tx alarm)
The default setting is NONE.
8.2.4 Demod Unlock
This defines the action the modem will take if the remote demodulator loses lock.
The two choices are:
• NOMINAL (reduce the Tx Output Power to the nominal value)
• MAXIMUM (increase the Tx Output Power to the maximum value permitted by
the parameter MAX RANGE)
The default setting is NOMINAL.
(Note that if the local demod loses lock, the modem will automatically move its output
power to the nominal value.)
8.3 Compensation Rate
As with any closed-loop control system, the loop parameters must be chosen to ensure
stability at all times. Several features have been incorporated to ensure that the AUPC
system does overshoot, or oscillate.
First, the rate at which corrections to the output power can be made is fixed at once every
4 seconds. This takes into account the round trip delay over the satellite link, the time
taken for a power change to be reflected in the remote demodulator’s value of Eb/No, and
other processing delays in the modems.
Second, if the comparison of actual and target Eb/No yields a result that requires a
change in output power, the first correction made will be 80% of the calculated step. This
avoids the possibility of overshoot. Subsequent corrections are made until the difference
is less than 0.5 dB. At this point, the output power is only changed in increments of 0.1
dB, to avoid ‘hunting’ around the correct set point.
- CD 1
- Errata A 3
- Errata B 5
- Errata C 7
- Errata D 9
- Carrier-in-Carrier 11
- CUSTOMER SUPPORT 12
- Table of Contents 13
- Preface MN/CDMQx.IOM 14
- About this Manual 17
- CONVENTIONS AND REFERENCES 17
- ELECTRICAL SAFETY 18
- INSTALLATION 19
- CE MARK 20
- TRADEMARKS 20
- WARRANTY POLICY 21
- Chapter 1. INTRODUCTION 23
- 1.2 Features 24
- 1.2.3 Verification 25
- 1.2.4 Data Interfaces 26
- 1.2.5 Turbo Product Coding 26
- 1.2.6 Remote Control 26
- 1.3 Major Assemblies 27
- 1.4.2 FAST System Theory 29
- 1.4.3 Implementation 29
- 1.4.4 Hardware Options 29
- Introduction MN/CDMQx.IOM 30
- 1.5 L-Band 31
- 1.6 Compatibility 31
- Chapter 2. INSTALLATION 33
- 2.2 Mounting 34
- Installation MN/CDMQx.IOM 35
- 2.3 Configuration 36
- 2.4 Select Internal IF Loop 36
- 2.5 Connect External Cables 36
- Chapter 3. FUNCTIONAL 37
- DESCRIPTION 37
- Chapter 4. EXTERNAL 41
- CONNECTIONS 41
- 4.2 Front Panel 42
- 4.3 Rear Panel 43
- 4.4 Chassis Connections 47
- 4.4.1 USB Port 47
- 4.4.3 485/232 Connector 47
- 4.4.4 Alarms Connector 48
- 4.5 AC Power Connector 52
- 4.6 DC Power Connector 52
- 4.7 Ground Connector 53
- Chapter 5. FRONT PANEL 55
- 5.2 Left-Hand Display Area 58
- 5.2.1 Modems 58
- 5.2.2 Redundancy 59
- 5.2.3 Spectrum Analyzer 60
- 5.5 Opening Screen 62
- 5.6 TOP LEVEL SELECTION 62
- 5.6.1 CONFIG 63
- (ConfigRemoteSerial) 64
- Address 65
- (ConfigRemoteEthernet) 65
- (ConfigRemoteEthernetMAC) 66
- On/Off Pwr 69
- Tx IF Freq: 1156.3456 MHz 72
- (◄ ►,▲ ▼, ENT) 72
- Rx:FEC Demod Code Data Freq 78
- Tx Roll-off: 20% 35% 78
- Rx Rs (n/k): (◄ ►, ENT) 79
- Rx FEC: Vit Vit+RS TCM+RS 79
- Sym:02500.000ksps 81
- STarrow 86
- +/-015 (▲ ▼ ENT) 86
- CnC SEARCH IS UNRESOLVED! 86
- (ConfigGroupModem) 87
- (ConfigGroupRedundancy) 88
- EDMAC or EDMAC-2 90
- AUPC+EDMAC MODE 90
- T1 Line Length: 94
- 000-133 feet (▲ ▼ 94
- G.703 E1 Line Code: 94
- 5.6.1.8 (ConfigMask) - MASK 96
- (ConfigODUBUCLO) - BUC LO 103
- (ConfigODULNB) LNB 104
- (ConfigODULNBLO) LO 106
- (ConfigODULNBMix) MIX 106
- 5.6.2 MONITOR 107
- Rx Traffic: AGC Alarm 108
- Tx Traffic: No Tx Clock 108
- UF=+11.7k RSL= 109
- UF=+11.7k Buf=50% RSL= 109
- Log 023: 30/11/02 10:37:32 110
- Log 024: 30/11/97 10:37:35 110
- Link Statistics: View 111
- Sta198: 02/11/02 10:37:32 111
- (for grouped as modem only) 113
- 5.6.3 TEST: 115
- IF LOOPBACK 119
- LOOPBACK 119
- I/O LOOPBACK 119
- 5.6.4 INFO (Information) 120
- 5.6.5 SAVE/LOAD 124
- 5.6.6 UTILITY 127
- IMPORTANT 129
- Chapter 6. FORWARD ERROR 133
- CORRECTION OPTIONS 133
- 6.2 Viterbi 134
- 6.3.1 Closed Network Modes 136
- 6.4 Trellis Coding 137
- 6.5.1 Introduction 138
- Decoding 142
- Viterbi with 143
- RS 220,200 143
- Outer Code 143
- 8-PSK/TCM Rate 2/3 144
- Decoding, with and 144
- Rate 3/4 QPSK, 8-PSK 145
- Comtech Turbo Product Codec 145
- Spec limit 146
- Rate 7/8 146
- Rate 21/44 BPSK 148
- Rate 5/16 BPSK 148
- Chapter 7. EDMAC CHANNEL 151
- 7.2 M&C Connection 152
- 7.3 Setup Summary 153
- EDMAC Channel MN/CDMQx.IOM 154
- Chapter 8. AUTOMATIC UPLINK 155
- POWER CONTROL 155
- 8.2.1 Target Eb/No 156
- 8.2.2 Max Range 156
- 8.2.3 Alarm 157
- 8.2.4 Demod Unlock 157
- 8.3 Compensation Rate 157
- 8.4 Monitoring 158
- Chapter 9. DoubleTalk™ 159
- OPERATION 159
- Chapter 10. REDUNDANCY 163
- Redundancy MN/CDMQx.IOM 164
- Chapter 11. ETHERNET 165
- MANAGEMENT 165
- 11.3.1 Web Server Menu Tree 167
- 11.4 SNMP Interface 172
- 11.4.3 SNMP Traps 173
- 11.5 Telnet Interface 174
- Appendix A. SUMMARY OF 179
- SPECIFICATIONS 179
- Comtech EF Data 180
- CDM-Qx Transmit 180
- Power Spectral Density 180
- A.2 Demodulator 181
- A.3 Data Interfaces 183
- A.5 Data Rate Ranges 184
- A.6 Framing Summary (Future) 185
- A.7 Miscellaneous 185
- Appendix B. FLASH UPGRADING 187
- Appendix C. REMOTE CONTROL 191
- C.2 RS-232 192
- C.3 Basic Protocol 192
- C.4 Packet Structure 193
- C.4.1 Start Of Packet 193
- C.4.5 Message Arguments 197
- C.4.6 End Of Packet 197
- C.5 Remote Commands 197
- C.5.1 TX Remote Commands 199
- C.5.2 RX Remote Commands 203
- C.5.4 Query Commands 220
- 7 bytes 221
- N/A 6 bytes Query only 227
- N/A 6 bytes Query Only 228
- C.5.5 Bulk Commands 230
- C.5.6 BUC Commands 232
- C.5.7 LNB Commands 235
- PERFORMANCE 243
- CHARACTERIZATION 243
- 16-QAM 3/4 Turbo 246
- QPSK 17/18 Turbo 249
- QPSK 3/4 Turbo 249
- QPSK 21/44 Turbo 249
- QPSK 7/8 Turbo 249
- D.5 Symbol Rate Ratio 250
- D.6 CnC Carrier Offset 250
- Carrier(s) 251
- Site A Site B 252
- D.10 Conclusion 256
- Metric Conversions 257
- 480 • 333 • 2200 PHONE 258
- 480 • 333 • 258
- 2161 FAX 258
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