SEMINAR REPORT ON VERY SMALL APERTURE TERMINAL(VSAT)

PRESENTED BY: Dr. SK. MASTAN VALI

WHAT IS VSAT ?WHAT IS VSAT ?VSAT is a device ( known as earth station )that is used

to receive satellite transmission. It has two basic components 1.OUTDOOR UNIT

2.INDOOR UNIT

ODU & IDUODU & IDU OUT DOOR UNIT

•ANTENNA

•RADIO FREQUENCY TERMINAL

•LOW NOISE AMPLIFIER

•SOLID STATE POWER AMPLIFIER

•LOW NOISE BREAKER

INDOOR UNIT

• It is the “ brain” of the VSAT.

• It contains the interface between the vsat & the customer’s equipment.

• This equipment can either be a PC, a TELEPHONE,TV, or almost any other equipment.

DIFFERENT VSATSDIFFERENT VSATS

VSAT NETWORKVSAT NETWORK A VSAT network has the following components: •A CENTRAL HUB

•A SATELLITE

•UNLIMITED REMOTE VSATS

HUB STATIONHUB STATION• The hub station is a relatively large, high performance earth

station with an antenna diameter of anything between 6 to 9 meters.

• The hub consists of a control center ,which manages the n/w as well as microwave equipment, including the outdoor antenna for the transmission and reception of signals.

• Outbound data from the hub is transmitted at relatively high data rates (56 to 1024 kb/s).

SATELLITESATELLITE• The satellite is a geostationary satellite. It is

essentially a repeater or mirror ,that reflects transmissions from the terminal back to earth .This enables one terminal of the network to communicate with another terminal hundreds of miles away . Furthermore, it also enables broadcasting information from one terminal to many others ,as the transmission of the signal from the satellite back to earth normally covers a large geographical area.

• Two types of satellites are there:

KU-BAND SATELLITE

C-BAND SATELLITE

GEOSTATIONARY GEOSTATIONARY SATELLITESATELLITE

VSAT NETWORKVSAT NETWORK

TOPOLOGYTOPOLOGYVSAT network can be arranged in following ways: STAR TOPOLOGY

MESH TOPOLOGY

HYBRID TOPOLOGY

STAR TOPOLOGYSTAR TOPOLOGY The earth hub station

acts as the central node & employs a large size transceiver.

Each remote user is supported by a VSAT.

The satellite provides a broadcast medium acting as a common connection point for all the remote VSAT earth station

HUB NETWORKHUB NETWORK

THERE ARE TWO TYPES OF HUB NETWORK:

SHARED HUB NETWORK

MINI HUB NETWORK

SHAREDSHARED HUB NETWORKHUB NETWORK To make the VSAT network more affordable the hub

is shared between several users ,there by spreading the cost.

The hub is usually owned by a service provider who retains overall control over the network.

Each user is allocated his own time slots or carriers & can operate his own private n/w using shared hub facility without any loss of privacy.

The operation and management of these sub network is performed by the users themselves.

VSAT SHARED HUB VSAT SHARED HUB NETWORKNETWORK

MINI HUB NETWORKMINI HUB NETWORK Each user has his own mini hub smaller &

simpler, and hence cheaper than a conventional hub.

Each user organization has complete control over his own communication.

Overall management of the complete n/w is provided by the service supplier who has a “super hub” which provides n/w supervision &diagnostic support.

MINI HUB NETWORK MINI HUB NETWORK CONFIGURATIONCONFIGURATION

ADVANTAGES OF VSAT ADVANTAGES OF VSAT TECHNOLOGYTECHNOLOGY

• COST EFFECTIVE

• FLEXIBILITY

• ACCESSIBILITY

• TRANSMISSION QUALITY

• HIGH NETWORK PERFORMANCE

• FAST TRANSMISSION

• CONTROL

• ABILITY TO HANDLE LARGE AMOUNTS OF DATA

• ABILITY TO HANDLE VOICE,VIDEO &DATA

APPLICATIONAPPLICATION• CREDIT CARD VERIFICATION

• CENTRALISED STOCK CONTROL

• CENTRALISED TICKET RESERVATION SYSTEM

• STOCK EXCHANGE PRICE BROAD CASTING

• VIDEO CONFERENCING

END OF SEMINAR THANK YOU