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13-02-2010, 10:35 AM

please sent me full seminar and presentation
report and presentation on the topic VSAT
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13-02-2010, 06:43 PM

VSAT (Very Small Aperture Terminal) is a two-way satellite ground station with a dish antenna that is smaller than 3 meters. Can possible to transmit Data rates range from 56 Kbit/s up to 4 Mbit/s. VSATs are most commonly used to transmit narrowband data (point of sale transactions such as credit card, polling or RFID data; or SCADA), or broadband data (for the provision of Satellite Internet access to remote locations, VoIP or video). VSATs are also used for transportable, on-the-move (utilizing phased array antennas) And in VSAT Communications data passes through a satellite using a signal path known as a transponder. satellites have between 24 and 72 transponders. A single transponder is capable of handling up to 155 million bits of information per second. With this immense capacity communication satellites are an ideal medium for transmitting and receiving almost any kind of content - from simple voice or data to the most complex and bandwidth-intensive video, audio and Internet most common VSAT configuration is the TDM/TDMA star network. This have a high bit rate outbound carrier (TDM) from the hub to the remote earth stations, and one or more low or medium bit rate Time Division Multiple Access (TDMA) inbound carriers.

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16-07-2011, 03:44 PM


.ppt   vsat communication for khushi.ppt (Size: 339 KB / Downloads: 107)
VSAT is an abbreviation for a Very Small Aperture Terminal. It is basically a two-way satellite ground station with a less than 3 meters tall (most of them are about 0.75 m to 1.2 m tall) dish antenna stationed. The transmission rates of VSATs are usually from very low and up to 4 Mbit/s. These VSATs’ primary job is accessing the satellites in the geosynchronous orbit and relaying data from terminals in earth to other terminals and hubs.
A satellite is basically any object that revolves around a planet in a circular or elliptical path. The moon is Earth's original, natural satellite, and there are many manmade (artificial) satellites, usually closer to Earth.
The term Satellite communication is very frequently used, but what is satellite communication? It is simply the communication of the satellite in space with large number of earth stations on the ground. Users are the ones who generate baseband signals, which is processed at the earth station and then transmitted to the satellite through dish antennas. Now the user is connected to the earth station via some telephone switch or some dedicated link.
Constituent parts of a VSAT configuration:-
Block upconverter (BUC)
Low-noise block converter (LNB)
Orthomode transducer (OMT)
Interfacility Link Cable (IFL)
Indoor unit (IDU)
An antenna (or aerial) is a transducer that transmits or receives electromagnetic waves. In other words, antennas convert electromagnetic radiation into an electrical signal and vice versa
A block upconverter (BUC) is used in the transmission (uplink) of satellite signals. It converts a band (or "block") of frequencies from a lower frequency to a higher frequency. Modern BUCs convert from the L band to Ku band, C band and Ka band. Older BUCs convert from a 70 MHz intermediate frequency (IF) to Ku band or C band.
Low-noise block converter (LNB):-
A low noise block-downconverter (or LNB) is the receiving device of a parabolic satellite dish antenna of the type commonly used for satellite TVreception. The device is sometimes called an LNA (for low noise amplifier), LNC (for low noise converter) or even LND (for low noise downconverter) but as block-downconversion is the principle function of the device, LNB is the preferred term, although this acronym is often incorrectly expanded to the incomplete descriptions, low noise block or low noise block converter.[
Orthomode transducer (OMT) :-
An orthomode transducer is a microwave duct component of the class of microwave circulators. It is commonly referred to as an OMT, and commonly referred as a polarisation duplexer. Such device may be part of a VSAT antenna feed Orthomode transducers serve either to combine or to separate two microwave signal paths. One of the paths forms the uplink, which is transmitted over the same waveguide as the received signal path, or downlink path.
Interfacility Link Cable (IFL) :-
An Inter-Facility Link (IFL) is the set of coaxial cables that connect the indoor equipment to the outdoor equipment of a satellite earth station. In a VSAT terminal, the IFL is usually one or two co-axial cables carrying IF signals, control signals, and DC powe
Indoor unit (IDU) :-
The Indoor Unit (IDU) is the component of the VSAT terminal that is located indoors. It is usually the satellite router. The IDU is connected to the Outdoor Unit (ODU) via Inter-Facility Link (IFL) cables
The earth station communicating with vsat can not transmit signal to to the satellite
Two way vsat:-
Station dealing with vsat can transmit signal to satellite as well as receive also

Mesh Network is a network where all the VSATS are connected to each other and is a complete network. In a Mesh Network every VSAT is connected to other VSAT on the network through hops. Some are connected through single vsat and some may be connected with more than one vsat.
Low cost broadband access
Return channel configuration based on business requirements
Very small contention rates where required
IP encryption for secure networking
Reliability and quality of service guaranteed by SLA
One stop solution for network design, implementation and support
Centrally managed from Datasat's UK Teleport
Monthly flat rate billing for subscribed bandwidth
VSAT’s Strengths :-
VSAT technology has many advantages, which is the reason why it is used so widely today.
One is availability.
The service can basically be deployed anywhere around the world.
the VSAT is diverse in that it offers a completely independent wireless link from the local infrastructure,
which is a good backup for potential disasters.
Its deployability is also quite amazing as the VSAT services can be setup in a matter of minutes.
The strength and the speed of the VSAT connection being homogenous anywhere within the boundaries is also a big plus.
Not to forget, the connection is quite secure as they ar private layer-2 networks over the air.
The pricing is also affordable, as the networks themselves do not have to pay a lot, as the broadcast download scheme (eg. DVB-S) allows them to serve the same content to thousands of locations at once without any additional costs.
Last but not least, most of the VSAT systems today use onboard acceleration of protocols (eg. TCP, HTTP), which allows them to delivery high quality connections regardless of the latency
VSAT’s Drawbacks:-
As with everything, VSAT also has its downsides.
Firstly, because the VSAT technology utilizes the satellites in geosynchronous orbit,
it takes a minimum latency of about 500 milliseconds every trip around.
Therefore, it is not the ideal technology to use with protocols that require a constant back and forth transmission, such as online games.
surprisingly, the environment can play a role in slowing down the VSATs.
Although not as bad as one way TV systems like DirecTV and DISH Network, the VSAT still can have a dim signal, as it still relies on the antenna size,
the transmitter’s power, and the frequency band.
Last but not least, although not that big of a concern,
installation can be a problem as VSAT services require an outdoor antenna that has a clear view of the sky.
An awkward roof, such as with skyscraper designs, can become problematic
Future applications:-
Advances in technology have dramatically improved the price/performance equation of FSS (Fixed Service Satellite) over the past five years.
New VSAT systems are coming online using Ka bandtechnology that promise higher bandwidth rates for lower costs.
FSS satellite systems currently in orbit have a huge capacity with a relatively low price structure. FSS satellite systems provide various applications for subscribers,
including: telephony, fax, television, high speed data communication services, Internet access, Satellite News Gathering (SNG), Digital Audio Broadcasting (DAB) and others.
These systems are applicable for providing various high-quality services because they create efficient communication systems, both for residential and business users.
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06-04-2012, 02:37 PM


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VSAT stands for Very Small Aperture Terminal and refers to combined send/receive terminals with a typical antenna diameter of 1 to 3.7 m linking the central hub to all remote offices and facilities and keeping them all in constant immediate contact. VSAT networks offer solutions for large networks with low or medium traffic. They provide very efficient point-to-multipoint communication, are easy to install and can be expanded at low extra cost. VSAT networks offer immediate accessibility and continuous high-quality transmissions. They are adapted for any kind of transmission, from data to voice, fax and video.

A very small aperture terminal (VSAT) is a device - also known as an earth station - that is used to transmit any data to the satellite and receive satellite transmissions. The "very small" component of the VSAT acronym refers to the size of the VSAT dish antenna -typically ranging from about 0.6 Meters to 3.8 Meters in diameter-which is mounted on roof- top, or placed on the ground. This Antenna, along with the attached low-noise blocker or LNB (which receives satellite signals) and the Transmitter (which sends signals) make up the VSAT Outdoor unit (ODU) which is one of main components of a VSAT earth station.

The second component of VSAT earth station is the Indoor unit (IDU). The indoor unit is a either a small desktop box or PC or a satellite Modem that contains receiver and transmitter boards and an interface to communicate with the user's existing in-house equipment - LANs, servers, PCs, TVs, kiosks, etc. The indoor unit is connected to the outdoor unit with the cable. The key advantage of a VSAT earth station over a typical terrestrial network connection is that VSAT are not limited by the reach of buried cable. A VSAT earth station can be placed anywhere - as long as it has an unobstructed view of the satellite. VSAT are capable of sending and receiving all sorts of video, data and audio content at the same high speed regardless of their distance from terrestrial switching offices and earth stations.

Superior Economics
Satellite networks are much less costly to deploy, maintain and operate than terrestrial network technologies. Terrestrial networks require heavy infrastructure, whether they are telephony networks (based on copper wiring, fiber optic cables, radio or microwave towers), or broadband data networks (such as Frame Relay, DSL, ISDN and cable).

Timely Deployment and Installation
Satellite networks can be rolled out to hundreds or thousands of locations in a fraction of time required for a comparable terrestrial network.

Multicast Content Distribution
Satellite's inherent strengths as a broadcast medium makes VSAT networks ideal for distribution of bandwidth-intensive information - data, video or audio - to large numbers of remote locations.

Satellite Connectivity
The antenna system comprises of a reflector, feedhorn and a mount. The size of a VSAT antenna varies from 1.8 metres to 3.8 metres. The feedhorn is mounted on the antenna frame at its focal point by support arms. The feed horn directs the transmitted power towards the antenna dish or collects the received power from it.

Advantages of VSAT
Advantages of VSAT networks include:
• Wide geographic coverage
• Independence from terrestrial communication infrastructure
• High availability
• Communication costs independent of transmission distance
• Flexible network configuration
• Rapid network deployment
• Centralized control and monitoring
• Any service can be provided from telephony through to ATM, Frame Relay, and of course, high speed broadband Internet

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29-08-2012, 01:46 AM

thaaaaaaaaaaaanx, you explained useful information about VSAT network system

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