By - FSET;USTC Student.

2.  A Very Small Aperture Terminal (VSAT) is a small
telecommunication earth station that receives and
transmits data, video or voice via satellite.
 It is a satellite-based Wide Area Network (WAN),
with centrally managed hub .
 The “Very Small” component of
the VSAT acronym refers to the
size of the VSAT dish
antenna-typically about 60 cm to
3.8 m .

3. • Earth segment : This segment is divided into 2 units :
Outdoor Unit (ODU) : It contains the antenna .
Reflector
Feed-Assembly
LNB-F (Optional)
LNB
(Front View)
(Rear View)

4.  Indoor Unit (IDU) : It Contains the interface between
the VSAT and the user’s equipment(PC’s , TV’s ,
Telephones) .
SKYSTAR 360E
(Front View) (Rear View)

5.  Space segment : A Geostationary earth orbital (GEO)
Satellite with a directional antenna integrated which
revolves around the equator at the same rotational
speed as the earth.

6.  An Earth Station acts as a hub . This ES has a very
powerful antenna of 15 to 36 foot wide which employs
routing capabilities and has high-speed connection to
wired backbone in order to serve as a gateway to/from
the VSAT network .
 Each end user is interconnected with the ES via
satellite , forming a star tropology .
 The hub controls the entire operation of
the network.
 For one user to communicate with
another, each transmission has to first go
to hub station and then retransmits it via
the satellite to the other end user’s VSAT.

8.  Computer communications ;
 Reservation systems ;
 Billing systems ;
 Electronic mail ;
 Video conferencing ;
 Point on sale transactions ;
 Credit checks and credit card verification ;
 Stock control and management .

9.  VSAT Advantages :
 High flexibility to increase the size of the network in the
future.
 Able to integrate large number of the networks.
 Covers distant geographical locations.
 Ability to handle Voice, Video and Data.
 As it is mobile, can be used for short time or in
emergency communication.
VSAT Disadvantages :
 Requires clear line of sight between
dish and satellite.
 Outages in some cases, because of
the weather. These outages
normally last for a few minutes.

10. THANK YOU