VSAT Basics
Presenter: Dave Rehbehn
What Is A VSAT
Very Small Aperture
Terminal
• Refers to the size of the antenna
reflector
• VSAT is generally .74 meter up...
VSAT Access Technologies
SCPC
(Single Channel Per Carrier)
DVB-S2(TDM)/FD-TDMA
F1
F2
DVB-S2
Forward
FD-TDMA
Return
Circuit...
VSAT Are IP Devices
 Satellite Modem
 Receives DVB-S2/ACM Forward Channel
 Transmit FD-TDMA Return Channel
 IP Router
...
VSATs Generate Bandwidth Efficiencies
Higher Layer Acceleration and Optimization through…
 HTTP Prefetch
 TCP Spoofing, ...
Key Components For a VSAT Network
Satellite
Remotes
Hub or Gateway
Internet or
Corporate Network
Why VSAT
Ubiquitous
Reliable
and Consistent
Scalable
and Manageable
Diverse
Uniform SLA and QoS Across Footprint
Simple Ne...
VSAT For Home
In North America, as of 2011, there are
over 1 million households using VSAT to
access the internet
VSAT For Business
Retail Banking
Oil Exploration
Lottery
VSATs Used By
Enterprises For
Remote Connectivity
Primarily Used ...
VSAT For High Availability
Terrestrial
VSAT
DSL
MPLS
etc
VRRP
with PBR
Remote Branch
Corp HQ
Satellite to Back Up Terrestr...
VSAT For Mobility
Fly-a-way VSAT
Man Pack VSAT
On The Pause VSAT
Maritime VSAT
Aeronautical VSAT
Considerations To Satellite: Latency
Satellite Orbit ~ 35,000 km Above Earth
Physical Delay Is About 250 ms roundtrip
Prot...
Satellite Frequencies
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 G...
Considerations To Satellite: Rain Fade
Atmospheric Moisture Attenuates Satellite Signal
Effect Is Greater At Higher Freque...
Future Of VSATs
1990 2000 2010
1990 2000 2010
1-5 Mbps
9.6 kbps
$$$$
$
Significant increase
in throughput and
performance
...
This is the end of this session, Hope
you enjoyed it and found it helpful.
You are most welcome to visit this
web site aga...
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Vsat basics - an ExploreGate tutorial

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Vsat basics - an ExploreGate tutorial

  1. 1. VSAT Basics Presenter: Dave Rehbehn
  2. 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. 3. VSAT Access Technologies SCPC (Single Channel Per Carrier) DVB-S2(TDM)/FD-TDMA F1 F2 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. 4. VSAT Are IP Devices  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 Typical VSAT Is Actually A Hybrid Device:
  5. 5. VSATs Generate Bandwidth Efficiencies Higher Layer Acceleration and Optimization through…  HTTP Prefetch  TCP Spoofing, ACK Reduction, Selective Retransmission  IP Header and Payload Compression Application Transport Network Data Link Physical InternetModel Lower Layer Efficiency through…  DVB-S2 with Adaptive Coding and Modulation (Forward Channel)  Frequency Division/Time Division Multiple Access (Return Channel) Satellite Bandwidth Is Limited Resource VSAT Systems Maximize Efficiencies
  6. 6. Key Components For a VSAT Network Satellite Remotes Hub or Gateway Internet or Corporate Network
  7. 7. Why VSAT Ubiquitous Reliable and Consistent Scalable and Manageable Diverse Uniform SLA and QoS Across Footprint Simple Network Architecture Independent of Terrestrial VSAT Complements Terrestrial Solutions To Enable Services To Un-Served And Under-Served Areas
  8. 8. VSAT For Home In North America, as of 2011, there are over 1 million households using VSAT to access the internet
  9. 9. VSAT For Business Retail Banking Oil Exploration Lottery VSATs Used By Enterprises For Remote Connectivity Primarily Used For Locations Which Are Underserved By Terrestrial
  10. 10. VSAT For High Availability Terrestrial VSAT DSL MPLS etc VRRP with PBR Remote Branch Corp HQ Satellite to Back Up Terrestrial Satellite to Load Share Terrestrial Satellite Enables True Path Diversity
  11. 11. VSAT For Mobility Fly-a-way VSAT Man Pack VSAT On The Pause VSAT Maritime VSAT Aeronautical VSAT
  12. 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 “spoofing” Protocols Such As TCP Can Be “Spoofed” or “Accelerated” Link Is Terminated At The VSAT Enables Fast Startup and Fast Transfer HTTP Object Pre-Fetch Enables Fast Delivery of HTTP Objects
  13. 13. Satellite Frequencies 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 Size of Antenna Impact of Rain
  14. 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. 15. Future Of VSATs 1990 2000 2010 1990 2000 2010 1-5 Mbps 9.6 kbps $$$$ $ Significant increase in throughput and performance Significant decrease in cost of service and hardware New Ka-Band Systems Promise To Provide More Bandwidth At Less Cost
  16. 16. 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. VSAT Basics

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