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Introduction
C-2 Vipersat CDM-570/570L User Guide
caused, for example, by the use of different antenna sizes in a mesh network, or
by rain fade conditions. Receive signal quality and use of system resources is
optimized, resulting in a reduction in power amplifier intermodulation as well as
conservation of satellite transmit power.
The power control algorithm is a closed loop servo-mechanism with the
received E
b
/N
0
values as the input function and the modulator transmit power as
the output function. Only modulator transmit power is controlled by the algo-
rithm since the transmit up-conversion chain is typically a fixed gain block.
DPC can be applied to any or all of the modems, with the exception of the
STDMA burst control demodulators. Since the STDMA burst demodulators are
SCPC fast acquisition receivers, they cannot provide stable signal quality
measurements (E
b
/N
0
). This value is critical in closing the power loop control
mechanism.
Note: The power control function for a DPC-enabled unit is active only when
that unit is operating in SCPC mode, and is inactive when operating in
STDMA mode.
NOTE
- CDM-570/570L 1
- User Guide 3
- COMTECH EF DATA 4
- Document Revision History 5
- Table of Contents 7
- Network Addressing 9
- Automatic Switching 9
- Dynamic Power Control 9
- ECM Migration 9
- Glossary 9
- L User Guide 10
- List of Figures 11
- Appendix A Figures 12
- Appendix B Figures 12
- Appendix C Figures 13
- List of Tables 15
- How to Use This Manual 17
- Conventions and References 18
- 1 - General 1-3 19
- Product Description 20
- Dynamic SCPC (dSCPC) 21
- Turbo Product Coding 22
- Header Compression 22
- Payload Compression 22
- Quality of Service 22
- Data Encryption 22
- New in this Release 23
- Customer Support 24
- QUICK START CONFIGURATION 25
- Initial Configuration 26
- Network Role 27
- Parameters 27
- Figure 2-3 29
- Figure 2-4 29
- Set the IP Address 30
- Configure the Route Table 31
- Figure 2-8 34
- Common Screen Commands 38
- Menu Descriptions 39
- Feature Configuration 41
- Vipersat Management 42
- Vipersat STDMA 42
- Vipersat Auto Switching 42
- Vipersat File Streamer 43
- STDMA Tx Rate 45
- Hub Type 46
- ECMv2 Mode 49
- Group ID 50
- STDMA Max Power Hunt 50
- Burstmap Multicast IP 51
- Outbound IP 52
- Cycles Per Burst Map 52
- Slot Guardband 53
- Slot Preamble Length 54
- Slot Data Length 54
- Total Slot Count 55
- Slot Cycle Length 56
- Slot Start in Cycle 56
- Set Remotes 56
- LNB LO Frequency 63
- BUC LO Frequency 63
- STDMA Statistics 64
- Show Hub Statistics 65
- Auto Switching 68
- Current WAN Transmit Mode 69
- ToS Switch Detection 70
- QoS Switch Detection 71
- STDMA Slot Capacity 76
- STDMA Switch Delay 76
- Percent Allocation 77
- SCPC Step Up Threshold 77
- SCPC Step Down Threshold 78
- SCPC Step Up Delay 78
- SCPC Step Down Delay 78
- SCPC Step Up Excess 79
- Time for Carrier Inhibit 80
- ToS Switching Parameters 81
- Hitless Switching Parameters 83
- SOTM Update 84
- Unit Role 85
- Expansion Unit 86
- Network ID 87
- Unit Name 87
- Receive Multicast Address 87
- Managing IP Address 88
- Management Security 89
- Primary Heart Beat 91
- Home State Revert 91
- Figure 3-74 92
- Figure 3-75 92
- DPC Enabled 93
- Calculate Max Power 93
- Target EbNo 95
- Speed Up EbNo 95
- Target DPC Address 96
- BaseLine Power 97
- DPC Offset 97
- SOTM Offset 97
- Force Modem to Home State 99
- STDMA State 99
- Transmit Frequency 99
- Transmit Data Rate 99
- Transmit FEC Type 100
- Transmit Coding Rate 100
- Transmit Modulation Type 101
- Transmit Power Level 101
- Transmit Enable 101
- Receive Frequency 101
- Receive FEC Type 102
- Receive Data Rate 102
- Vipersat Summary 103
- Vipersat Configuration 104
- Vipersat Migration 105
- UDP Port Base Address 105
- NETWORK ADDRESSING 107
- The OSI Reference Model 108
- Binary Math 110
- IP Addressing 112
- Private Network IP Addresses 114
- Subnet Mask 115
- Network Segments 116
- Default Gateways 117
- MAC Addresses 117
- AUTOMATIC SWITCHING 119
- Load Switching 121
- Burst Controller 122
- STDMA ACK Message 123
- Load Switching—STDMA Hub 125
- Hub Switching Process 126
- Load Switching—Remote 127
- Determination for Switching 129
- Load Switch Example 130
- Application Switching 133
- ToS Switching 135
- Configuration 137
- Example Implementations 138
- ToS Remarking 139
- ToS to DSCP Value Conversions 140
- Entry Channel Mode Switching 142
- Fail-Safe Operation 143
- Using STDMA ECM 145
- Figure B-15 146
- Dynamic Entry Channel Mode 148
- Hub Configuration 149
- Remote Configuration 150
- ECM Processing 151
- DYNAMIC POWER CONTROL 153
- Introduction 154
- STDMA mode 154
- Description 155
- Theory of Operation 156
- Figure C-2 158
- Main DPC Menu 161
- Enable DPC 162
- Target Eb/No 162
- Calculate Max Power Menu 163
- Max Power 166
- MODEM 167
- Power Considerations 168
- Cabling Considerations 168
- ECM MIGRATION 171
- Migration Procedure 173
- Configure Hub Unit 175
- Vipersat ECM Calculator 177
- GLOSSARY 179
- Appendix E - Glossary E-3 181
- Appendix E - Glossary E-5 183
- Appendix E - Glossary E-7 185
- Appendix E - Glossary E-9 187
- Appendix E - Glossary E-11 189
- Appendix E - Glossary E-13 191
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