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VSAT
[Very Small Aperture Antenna]
5/16/2014
1
 11BEC1015 -KOTESWARA RAO
 11BEC1034 -T.KRISHNA CHAITANYA
 11BEC1035 -VIDYANATH.M
 11BEC1074 -K.HARSHAVARDHAN
5/16/2014
2
VSAT stands for Very Small Aperture Terminal. It is a
small satellite dish that is capable of both receiving and
sending satellite signals. VSAT systems can be designed
to serve both broadcast and interactive applications
whether data, voice or video, which are now being
served by terrestrial lines.
5/16/2014
3
Why VSAT?
• Early Earth Stations in commercial systems were very
large and expensive (30 m).
• Need to make system more affordable to end user:
• Increased transmit power from satellite.
• Higher frequencies
• Result: Smaller ES antenna size required 5/16/2014
4
The dish is small, easily transportable and
installation lead-time is much shorter if compared
to terrestrial links. In addition, VSAT network
allows rapid, low-cost network re-configuration
and expansion to meet new or unexpected business
requirements.
VSAT - 75 cm to 1.2 m.
 Data rates - 4 kbit/s up to 4 Mbit/s
sometimes up to a max downlink of up to 16
Mbit/s with some upgraded modules and
enhancements.
5/16/2014
5
Cost effective transmission and network operations
are made possible by use of the C-band satellite
frequency and frequency times division multiple
access (FTDMA), Frequency division multiple
access (FDMA) or Time division multiple access
(TDMA) transmission techniques.
5/16/2014
6
VSAT offers a wide of protocols and
features, providing extraordinary flexibility and
virtually unlimited expansion capabilities. In
addition, VSAT network is typically engineered to
achieve a minimum of 99.7% end-to-end
availability for all locations
5/16/2014
7
Underlying objective of VSAT Systems:
bring the service directly to the end-user
Major reasons for doing this
Reduce hierarchical distribution network (make
more efficient and faster)
Reduce distribution costs
5/16/2014
8
Fig. 2.5 in: INTELSAT VSAT Handbook, September 1998. Available from Application
Support and Training, INTELSAT, 3400 International Drive, NW, Washington, DC
20008-3098, USA
5/16/2014
9
5/16/2014
10
There are several ways VSAT services might be
implemented
One-Way (e.g. TV Broadcasting satellites)
Split-Two-Way (Split IP) Implementation (return link
from user is not via the satellite; e.g. DirecTV)
Two-Way Implementation (up- and down-link)
5/16/2014
11
There are basically two ways to
implement a VSAT Architecture
STAR
VSATs are linked via a HUB
MESH
VSATs are linked together without going
through a large hub
5/16/2014
12
Higher Propagation delay
Used by TDMA VSATs
High central hub investment
Smaller VSAT antenna sizes (1.8 m typically)
Lower VSAT costs
Ideally suited for interactive
data applications
Large organizations, like banks, with
centralized data processing requirements
5/16/2014
13
Lower Propagation delay (250 ms)
Used by PAMA/DAMA VSATs
Lower central hub investment
larger VSAT antenna sizes (3.8 m typically)
Higher VSAT costs
Suited for high data traffic
Telephony applications and point-to-point
high-speed links
 Star network:
The VSAT terminals communicate each other through Hub.
5/16/2014
14
5/16/2014
15
Master Control Station
(The Hub)
VSAT
Community
All communications to and
from each VSAT is via the
Master Control Station or
Hub
Picture copyrights on introductory slides. Reproduction with permission only.
Outdoor Unit (ODU)
Inter-facility link (IFL)
Indoor Unit (IDU)
5/16/2014
16
Source: www.bhartibt.com
5/16/2014
17
• The VSAT Outdoor Unit (ODU) is located where it will have a clear line
of sight to the satellite and is free from casual blockage by people and/or
equipment moving in front of it. It includes the Radio Frequency Trasceiver
(RFT).
• The Inter Facility Link (IFL) carries the electronic signal between the
ODU and the Indoor Unit (IDU) as well as power cables for the ODU and
control signals from the IDU.
• The IDU is normally housed in a desktop computer at the User’s
workstation and consists of the baseband processor units and interface
equipment (e.g. computer screen and keyboard). The IDU will also house
the modem and multiplexer/demultilexer (mux/demux) units if these are not
already housed in the ODU.
5/16/2014
18
LNB
Reflector
LNB-F (Optional)
(Front) (Rear)
Feed-Assembly
SSPA (HPC)
LNB-F (Optional)
LNB
5/16/2014
19
Antenn
aFee
d
LNC
HPC
DEM
MO
D
To
Data
Terminal
Equipmen
t
IFL
Outdoor Unit
(ODU)
Indoor Unit (IDU)
RFT
Base
Band
Processor
(BBP)
RFT
IFL
IDU
5/16/2014
20
5/16/2014
21
5/16/2014
22
VSAT is an ideal satellite network that provides
communications support for a wide range of applications: -
Point-of-sales transaction
- Order-Entry Billing
- Inventory Control
- Financial Management
- Data processing
- Reservation System
- Telemetry & Data Collection
- News Wire Services
- Private-Line Voice
- Virtual Private Networks
- Distance Education
- High Speed Internet Access 5/16/2014
23
VSAT presents new alternatives to the problems of
conventional fixed terrestrial telecommunication beyond
PSTN areas. VSAT can also help to design tailored
communication business to the following sectors: - Finance
and banking
- Government Agencies
- Manufacturing
- Mining and explorations
- News agency
- Shipping and freight handling·
- Travel and tourism
- Agricultural companies
5/16/2014
24
Access in Remote Locations
Internet Access
Rapid deployment
VPN
Qos
Mobile Access
Bandwidth Allocation
Scalable 5/16/2014
25
Cost
Standards based
Reliable
Back-up to Terrestrial Networks
Inter-operation with Terrestrial Networks
Single Hop
Bandwidth on Demand
Cost per connection is independent of the location/
distance
5/16/2014
26
Like any other technology, VSAT has its limitations too.
Some of them include the extremely high initial
cost needed for building and launching satellites in the
Geo-Synchronous orbit, higher initial cost and recurring
monthly costs for terminal equipments needed for
providing Internet over broadband when compared to
terrestrial DSL networks, Bit Error Rate is common for
satellite based technologies, Rain Attenuation might
affect the performance of VSAT communications under
rainy conditions,
5/16/2014
27
latencies (>200 ms) are still higher than their terrestrial equivalent
technologies (<100 ms),careful direction of subscriber side
terminals and dish antennas are critical for proper working,trained
man power is required for installation and
maintenance, other competitive technologies(Internet Leased
Lines, 3G/HSDPA/4G Cellular technologies etc) offer much
higher bandwidth at a lower cost than what is possible by VSAT
based networks, the antennas need to be fixed outside the offices
or homes hence making them susceptible to damage or theft, the
cost of VSAT modules for Network Routers/ Video Conferencing
systems are quite high, etc
5/16/2014
28
Thank you
5/16/2014
29

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Vsat

  • 1. VSAT [Very Small Aperture Antenna] 5/16/2014 1
  • 2.  11BEC1015 -KOTESWARA RAO  11BEC1034 -T.KRISHNA CHAITANYA  11BEC1035 -VIDYANATH.M  11BEC1074 -K.HARSHAVARDHAN 5/16/2014 2
  • 3. VSAT stands for Very Small Aperture Terminal. It is a small satellite dish that is capable of both receiving and sending satellite signals. VSAT systems can be designed to serve both broadcast and interactive applications whether data, voice or video, which are now being served by terrestrial lines. 5/16/2014 3
  • 4. Why VSAT? • Early Earth Stations in commercial systems were very large and expensive (30 m). • Need to make system more affordable to end user: • Increased transmit power from satellite. • Higher frequencies • Result: Smaller ES antenna size required 5/16/2014 4
  • 5. The dish is small, easily transportable and installation lead-time is much shorter if compared to terrestrial links. In addition, VSAT network allows rapid, low-cost network re-configuration and expansion to meet new or unexpected business requirements. VSAT - 75 cm to 1.2 m.  Data rates - 4 kbit/s up to 4 Mbit/s sometimes up to a max downlink of up to 16 Mbit/s with some upgraded modules and enhancements. 5/16/2014 5
  • 6. Cost effective transmission and network operations are made possible by use of the C-band satellite frequency and frequency times division multiple access (FTDMA), Frequency division multiple access (FDMA) or Time division multiple access (TDMA) transmission techniques. 5/16/2014 6
  • 7. VSAT offers a wide of protocols and features, providing extraordinary flexibility and virtually unlimited expansion capabilities. In addition, VSAT network is typically engineered to achieve a minimum of 99.7% end-to-end availability for all locations 5/16/2014 7
  • 8. Underlying objective of VSAT Systems: bring the service directly to the end-user Major reasons for doing this Reduce hierarchical distribution network (make more efficient and faster) Reduce distribution costs 5/16/2014 8
  • 9. Fig. 2.5 in: INTELSAT VSAT Handbook, September 1998. Available from Application Support and Training, INTELSAT, 3400 International Drive, NW, Washington, DC 20008-3098, USA 5/16/2014 9
  • 11. There are several ways VSAT services might be implemented One-Way (e.g. TV Broadcasting satellites) Split-Two-Way (Split IP) Implementation (return link from user is not via the satellite; e.g. DirecTV) Two-Way Implementation (up- and down-link) 5/16/2014 11
  • 12. There are basically two ways to implement a VSAT Architecture STAR VSATs are linked via a HUB MESH VSATs are linked together without going through a large hub 5/16/2014 12
  • 13. Higher Propagation delay Used by TDMA VSATs High central hub investment Smaller VSAT antenna sizes (1.8 m typically) Lower VSAT costs Ideally suited for interactive data applications Large organizations, like banks, with centralized data processing requirements 5/16/2014 13 Lower Propagation delay (250 ms) Used by PAMA/DAMA VSATs Lower central hub investment larger VSAT antenna sizes (3.8 m typically) Higher VSAT costs Suited for high data traffic Telephony applications and point-to-point high-speed links
  • 14.  Star network: The VSAT terminals communicate each other through Hub. 5/16/2014 14
  • 15. 5/16/2014 15 Master Control Station (The Hub) VSAT Community All communications to and from each VSAT is via the Master Control Station or Hub Picture copyrights on introductory slides. Reproduction with permission only.
  • 16. Outdoor Unit (ODU) Inter-facility link (IFL) Indoor Unit (IDU) 5/16/2014 16 Source: www.bhartibt.com
  • 17. 5/16/2014 17 • The VSAT Outdoor Unit (ODU) is located where it will have a clear line of sight to the satellite and is free from casual blockage by people and/or equipment moving in front of it. It includes the Radio Frequency Trasceiver (RFT). • The Inter Facility Link (IFL) carries the electronic signal between the ODU and the Indoor Unit (IDU) as well as power cables for the ODU and control signals from the IDU. • The IDU is normally housed in a desktop computer at the User’s workstation and consists of the baseband processor units and interface equipment (e.g. computer screen and keyboard). The IDU will also house the modem and multiplexer/demultilexer (mux/demux) units if these are not already housed in the ODU.
  • 23. VSAT is an ideal satellite network that provides communications support for a wide range of applications: - Point-of-sales transaction - Order-Entry Billing - Inventory Control - Financial Management - Data processing - Reservation System - Telemetry & Data Collection - News Wire Services - Private-Line Voice - Virtual Private Networks - Distance Education - High Speed Internet Access 5/16/2014 23
  • 24. VSAT presents new alternatives to the problems of conventional fixed terrestrial telecommunication beyond PSTN areas. VSAT can also help to design tailored communication business to the following sectors: - Finance and banking - Government Agencies - Manufacturing - Mining and explorations - News agency - Shipping and freight handling· - Travel and tourism - Agricultural companies 5/16/2014 24
  • 25. Access in Remote Locations Internet Access Rapid deployment VPN Qos Mobile Access Bandwidth Allocation Scalable 5/16/2014 25
  • 26. Cost Standards based Reliable Back-up to Terrestrial Networks Inter-operation with Terrestrial Networks Single Hop Bandwidth on Demand Cost per connection is independent of the location/ distance 5/16/2014 26
  • 27. Like any other technology, VSAT has its limitations too. Some of them include the extremely high initial cost needed for building and launching satellites in the Geo-Synchronous orbit, higher initial cost and recurring monthly costs for terminal equipments needed for providing Internet over broadband when compared to terrestrial DSL networks, Bit Error Rate is common for satellite based technologies, Rain Attenuation might affect the performance of VSAT communications under rainy conditions, 5/16/2014 27
  • 28. latencies (>200 ms) are still higher than their terrestrial equivalent technologies (<100 ms),careful direction of subscriber side terminals and dish antennas are critical for proper working,trained man power is required for installation and maintenance, other competitive technologies(Internet Leased Lines, 3G/HSDPA/4G Cellular technologies etc) offer much higher bandwidth at a lower cost than what is possible by VSAT based networks, the antennas need to be fixed outside the offices or homes hence making them susceptible to damage or theft, the cost of VSAT modules for Network Routers/ Video Conferencing systems are quite high, etc 5/16/2014 28