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Vipersat Configuration
3-42 Vipersat CDM-570/570L User Guide
SCPC Step Down Threshold
This menu item appears for Remote modems only.
The SCPC Step Down Threshold establishes the percentage of bandwidth use
that will trigger a switch down from the present SCPC rate to a lower rate to
ensure efficient bandwidth usage.
A default value (65%) is provided, but if a different threshold is desired, an
alternate value can be specified by entering D at the command prompt in the
Auto Switching screen to display the dialog shown in figure 3-52. Note that
this value must be less than the value specified for the SCPC Step Up Thresh-
old.
Figure 3-52
SCPC Step Down Threshold prompt
SCPC Step Up Delay
This menu item appears for Remote modems only.
The SCPC Step Up Delay feature provides a switching delay period to ensure
that a premature switch up in the SCPC rate does not occur due to a temporary
rise in traffic.
A default value (10 seconds) is provided, but this parameter can be modified by
entering W at the command prompt in the Auto Switching screen to display the
dialog shown in figure 3-53.
Figure 3-53
SCPC Step Up Delay prompt
SCPC Step Down Delay
This menu item appears for Remote modems only.
- 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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