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The OSI Reference Model
A-2 Vipersat CDD-56X Series User Guide
The OSI Reference Model
OSI is an acronym for Open Systems Interconnection. This is a network model
created by ISO (the International Standardization Organization.) The OSI model
is the basic standard which forms the basis for all networking protocols.
Figure A-1
The Seven OSI Protocol Layers
The OSI model defines the building blocks used to construct a working network
protocol as shown in Figure A-1. The blocks on the right show the individual
layers which make up the OSI model and the blocks on the left show the layer’s
functional grouping.
Each layer, as defined by the OSI model, is only aware of the layers directly
above and below it.
Layers 1 – 3
Layer 1 / Physical – Layer 1 defines the physical means by which actual bits
are sent and received. This layer, for example, is where connectors, cable
lengths, and signaling specifications are defined.
Layer 2 / Data Link – Layer 2 consist of two sub-layers:
• Logical Link Control (LLC) – The LLC packages bytes received from the
MAC into a format readable by the Network Layer above it.
• Media Access Control (MAC) – The MAC is concerned with obtaining
access to the network at an appropriate time; i.e., when no other machines
are communicating or when permission has been granted.
- User Guide 1
- Vipersat CDD-56X Series 3
- Document Revision History 5
- Table of Contents 7
- Appendix A 8
- Appendix B 8
- Appendix C 9
- Appendix D 9
- Appendix E 9
- List of Figures 11
- Appendix A Figures 12
- Appendix B Figures 12
- Appendix C Figures 12
- Appendix D Figures 12
- List of Tables 13
- How to Use This Manual 15
- Conventions and References 16
- Product Description 17
- Router Features 18
- Dynamic SCPC (dSCPC) 18
- Single Hop On Demand 19
- New in This Release 20
- Chapter 1 - General 1-7 21
- Customer Support 22
- Reader Comments / Corrections 23
- QUICK START CONFIGURATION 25
- Initial Configuration 26
- Table 2-1 27
- Figure 2-1 28
- Figure 2-2 28
- Figure 2-3 29
- Figure 2-4 29
- Figure 2-5 30
- Table 2-2 30
- Figure 2-6 31
- Figure 2-7 33
- Figure 2-8 34
- Figure 2-9 35
- Common Screen Commands 38
- Menu Descriptions 39
- Figure 3-1 39
- Figure 3-2 40
- Figure 3-3 40
- Figure 3-4 41
- Figure 3-5 42
- Vipersat File Streamer 43
- Vipersat Configuration 44
- Figure 3-6 44
- Figure 3-7 45
- Figure 3-8 45
- Figure 3-9 46
- Group ID 48
- Figure 3-10 49
- Figure 3-11 50
- Figure 3-12 51
- Figure 3-13 51
- Figure 3-15 52
- Figure 3-14 52
- Figure 3-16 53
- Figure 3-17 54
- Figure 3-18 54
- Figure 3-19 55
- Figure 3-20 56
- Figure 3-21 56
- Figure 3-22 57
- Figure 3-23 58
- Figure 3-24 58
- Figure 3-25 59
- Figure 3-26 59
- Figure 3-27 60
- Figure 3-28 60
- Figure 3-29 60
- Figure 3-30 61
- Figure 3-31 61
- Figure 3-32 62
- Figure 3-33 62
- Figure 3-34 63
- Figure 3-35 63
- Figure 3-36 64
- Figure 3-37 64
- Figure 3-38 66
- Figure 3-39 67
- Figure 3-40 68
- Figure 3-41 68
- Figure 3-42 69
- Figure 3-43 70
- Figure 3-44 71
- Figure 3-45 71
- Figure 3-46 72
- Figure 3-47 73
- Figure 3-48 73
- Figure 3-49 74
- Figure 3-50 74
- Primary Heart Beat 75
- Home State Revert 75
- Figure 3-51 77
- Figure 3-52 77
- Figure 3-53 78
- Figure 3-54 79
- Figure 3-55 80
- Figure 3-56 81
- Figure 3-57 81
- Figure 3-58 82
- Figure 3-59 82
- Figure 3-60 83
- Figure 3-61 83
- Figure 3-62 84
- Figure 3-63 85
- Figure 3-64 86
- NETWORK ADDRESSING 87
- The OSI Reference Model 88
- Figure A-1 88
- Binary Math 90
- IP Addressing 92
- Private Network IP Addresses 94
- Subnet Mask 95
- Network Segments 96
- Figure A-9 97
- Example: 00-3f-bf-00-01-45 97
- Figure A-10 98
- AUTOMATIC SWITCHING 99
- Load Switching 101
- Table B-1 101
- Figure B-1 103
- Load Switching Process 104
- Figure B-2 105
- Load Switch Example 106
- Figure B-3 107
- Figure B-4 109
- Application Switching 109
- B - Automatic Switching B-13 111
- Fail-Safe Operation 112
- Figure B-5 113
- Figure B-6 114
- DYNAMIC POWER CONTROL 115
- Description 117
- Table C-1 117
- Adjustment for Data Rate 119
- Figure C-1 120
- NETWORK MIGRATION 123
- Firmware Upgrade 125
- Figure D-1 126
- Figure D-2 127
- Figure D-3 127
- Figure D-4 128
- Figure D-5 128
- Figure D-6 129
- Figure D-7 130
- Figure D-8 131
- Figure D-9 132
- Figure D-10 132
- Figure D-11 133
- Figure D-12 133
- Figure D-13 134
- Figure D-14 134
- Figure D-15 135
- Figure D-16 135
- Figure D-17 136
- Figure D-18 136
- Figure D-19 137
- Figure D-20 137
- Figure D-21 138
- Figure D-22 139
- Figure D-23 139
- GLOSSARY 141
- Appendix E - Glossary E-3 143
- Appendix E - Glossary E-5 145
- Appendix E - Glossary E-7 147
- Appendix E - Glossary E-9 149
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