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Vsat basic
- 1. VSAT Basics Presenter: Dave Rehbehn
- 2. What Is A VSAT Very Small Aperture Terminal • Refers to the size of the antenna reflector • VSAT is generally .74 meter up to 2.4 meter VSAT (remote station) consists of: Outdoor Unit (ODU): • Reflector • Transceiver (BUC and LNB) IFL Cable • Coax cable to connect IDU to ODU Indoor Unit (IDU) • Ethernet interface to LAN
- 3. VSAT Access Technologies SCPC (Single Channel Per Carrier) F1 F2 DVB-S2(TDM)/FD-TDMA DVB-S2 Forward FD-TDMA Return Circuit Based Access Scheme Mesh Topology (point to point) Dedicated Bandwidth Well Suited To High Capacity Links Packet Based Access Scheme Star Topology (point to multipoint) Shared Bandwidth Well Suited To Last Mile IP Access DVBS2/FD-TDMA VSATs Are The Biggest Part Of The Market
- 4. VSAT Are IP Devices Typical VSAT Is ActuallyA Hybrid Device: Satellite Modem Receives DVB-S2/ACM Forward Channel Transmit FD-TDMA Return Channel IP Router Network/Port Address Translation DHCP Server/Relay DNS Caching Routing Protocols IP Header Compression IP Payload Compression
- 5. Internet Model VSATs Generate Bandwidth Efficiencies Satellite Bandwidth Is Limited Resource VSAT Systems Maximize Efficiencies Higher Layer Acceleration and Optimization through… HTTP Prefetch Application Transport Network Data Link Physical TCP Spoofing, ACK Reduction, Selective Retransmission IP Header and Payload Compression Lower Layer Efficiency through… DVB-S2 with Adaptive Coding and Modulation (Forward Channel) Frequency Division/Time Division Multiple Access (Return Channel)
- 6. Key Components For a VSAT Network Satellite Remotes Hub or Gateway Internet or Corporate Network
- 7. Why VSAT Ubiquitous Uniform SLA and QoS Across Footprint Simple Network Architecture Independent of Terrestrial Reliable and Consistent Scalable and Manageable Diverse VSAT Complements Terrestrial Solutions To Enable Services To Un-Served And Under-Served Areas
- 8. VSAT For Home In North America, as of 2011, there are over 1 million households using VSAT to access the internet
- 9. VSAT For Business Retail Banking VSATs Used By Enterprises For Remote Connectivity Oil Exploration Primarily Used For Locations Which Are Underserved By Terrestrial Lottery
- 10. DSL VSAT For High Availability Remote Branch VSAT Satellite to Back Up Terrestrial Satellite to Load Share Terrestrial VRRP with PBR Corp HQ MPLS etc Terrestrial Satellite Enables True Path Diversity
- 11. VSAT For Mobility Fly-a-way VSAT Man Pack VSAT On The Pause VSAT Maritime VSAT Aeronautical VSAT
- 12. Considerations To Satellite: Latency Satellite Orbit ~ 35,000 km Above Earth Physical Delay Is About 250 ms roundtrip Protocol Processing Adds ~300-500 ms Protocols Such As TCP Can Be “Spoofed” or “Accelerated” “spoofing” Link Is Terminated At The VSAT Enables Fast Startup and Fast Transfer HTTP Object Pre-Fetch Enables Fast Delivery of HTTP Objects
- 13. Satellite Frequencies Size of Antenna Impact of Rain Ka band 26.5 to 40 GHz K band 18 to 26.5 GHz Ku band 12 to 18 GHz X band 8 to 12 GHz C band 4 to 8 GHz S band 2 to 4 GHz L band 1 to 2 GHz
- 14. Considerations To Satellite: Rain Fade Atmospheric Moisture Attenuates Satellite Signal Effect Is Greater At Higher Frequencies (eg, Ku and Ka) Rain Fade Mitigation Techniques: Forward Channel • DVB-S2 with Adaptive Coding and Modulation • Uplink Power Control Return Channel • Adaptive Coding • Symbol Rate Change • Uplink Power Control
- 15. Future Of VSATs 1-5 Mbps Significant increase in throughput and performance 9.6 kbps 1990 2000 2010 $$$$ Significant decrease in cost of service and hardware $ 1990 2000 2010 New Ka-Band Systems Promise To Provide More Bandwidth At Less Cost
- 16. VSAT Basics This is the end of this session, Hope you enjoyed it and found it helpful. You are most welcome to visit this web site again and watch other video tutorials in your areas of interest.