How Vsat Network Works

How does a VSAT mesh work? A VSAT network has three lots A central hub (also called a crucify earth station) The air A virtually unlimited chassis of VSAT earth stations in various locations across a country or innocent Content originates at the hub, which features a very large -15 to 36-foot (4,5 -11m)- forward pass. The hub controls the network through a network management system (NMS) server, which allows a network operator to monitor and control all components of the network. The NMS operator can view, modify and download individual configuration schooling to the individual VSATs. pic Outbound information (from the hub to the VSATs) is sent up to the conference theory satellites transponder, which receives it, amplifies it and beams it back to earth for reception by the remote VSATs. The VSATs at the remote locations send information inbound (from the VSATs to the hub) via the equal satellite transponder to the hub station. This arrangement, where all network comm unication passes through the networks hub processor, is called a star configuration, with the hub station at the center of the star.One major advantage of this configuration is that there is virtually no limit on the number of remote VSATs that can be connected the hub. Mesh configurations also allow for direct communication between VSATs. What is a VSAT? A very small aperture entrepot (VSAT) is a device known as an earth station that is used to receive satellite transmissions. The very small component of the VSAT acronym refers to the size of the VSAT dish antenna -typically about 2 to 4 feet (0. 55-1. 2 m) in diameter- that is mounted on a roof on a wall, or pose on the ground.This antenna, on 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), one of the two components of a VSAT earth station. pic The second component of VSAT earth station is the indoor unit (IDU) . The indoor unit is a small desktop box or PC that contains receiver and transmitter boards and an port to communicate with the users existing in-house equipment LANs, servers, PCs, TVs, kiosks, etc. The indoor unit is connected to the outdoor unit with a pair of cables. pic The key advantage of a VSAT earth station, versus a typical terrestrial network connection, is that VSATs be 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. VSATs 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 infrastructure. Advantages of VSAT technology As companies compete for an increasingly savvy customer looking for value (quality and service), information technology and communications networks are becoming tools to achieve business goals. Todays networks must support the need to improve customer service, growth per site revenues and reduce cost (all driving net income growth) in the most cost-effective manner possible. Further, network managers want virtual 100% availability. They need to easily expand the network when they acquire, cash in ones chips or add new sites to the operations.In addition, they require network flexibility ease of migration from existing legacy systems as well as addition of new network applications as their companies offer additional function to its customers Businesses and organizations give many reasons for using VSAT networks over terrestrial alternatives. Among them are pCost-effective ic pFlexibility ic p handiness ic pAvailability ic pReliability ic pVersatility ic pTransmission quality ic pHigh network performance ic pFast transmissions ic pControl ic pAbility to handle large amounts of data ic pSingle vendor solution for both equipment and bandwidth ic pBroadcast capability ic pAbility to handle Voice, Video and Data ic OVERVIEW VSAT technology is a telecommunication system based on wireless satellite technology. The term VSAT stands for precise Small Aperture Terminal. As the definition itself indicates, VSAT technology is made up of a small satellite earth station and a typical antenna of 1. 8 meter diameter. There are three components in a VSAT network. The first is called the Master Earth Station which is the network control center for the entire VSAT network.The configuration, observe and management of the VSAT network are done at this location. pic The Master Earth Station also has a large six-meter antenna, a fully redundant electronics, poised backup power system, and a regulated air conditioning system. This Master Earth Station is manned 24 x 7 days throughout the year. The second component is the VSAT remote earth station. This is the hardware installed at the customers premises that includes the outd oor unit (ODU), the indoor unit (IDU) and the interfacility link (IFL). The VSAT outdoor unit consists of a standard 1. 8 meter offset feed antenna, a solid state amplifier (SSPA), a Low Noise Amplifier (LNA), and a Feedhorn.The indoor unit is a VCR-sized unit that houses the communications electronics that includes interface with the customers equipment such as computers or telephones. The IFL consists of coaxial cables that connects the outdoor unit to the indoor unit. pic The third component of a VSAT network is the satellite itself. All signals sent between the VSAT earth stations are beamed through the satellite. The VSAT system uses a geostationary satellite, which is orbiting at 36,000 km above the ground. VSAT (Very Small Aperture Terminal) are small fixed satellite antennas that provide highly reliable communication means for data, voice and fax between almost any number of geographically dispersed sites.VSAT technology represents a cost effective solution for users seeking an independent communications network connecting a number of remote sites. VSAT networks offer value-added satellite-based services capable of supporting the Internet, data, LAN, voice/fax communications, and can provide powerful, dependable private and public network communications VSAT satellite communication provides reliable digital data communication and the use of VSAT provides the ability to expand capacity and system growth, while maintaining a handle on costs which are closely associated with the increase in capacity or system growth. VSATs are used for a wide variety of telecommunications applications, including -Internet/Intranet access -Corporate networks SCADA/Line monitor -Rural telecoms -Environmental Monitoring -Distance Learning -Seismic Monitoring -Telemedicine -Utility monitoring -Disaster recovery -Remote Video Monitoring -Ship-board communications Corporate companies are now utilising both terrestrial and satellite communication to connect to remote offices mo st the country side. The cost and security advantage of satellite bandwidth compared with some terrestrial circuits ensures that the number and diversity of VSAT networks will continue to grow in the future. The mining, construction and embrocate&gas industries are typical examples of applications which find advantages with VSAT.