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VSAT
VSATs (Very Small Aperture Terminals) is a two way, lost cost, ground micro station for transmitting data to and from communication satellites. A VSAT has a dish antenna with diameters between 75 cm to 1 m, which is very small in comparison with 10 m diameter of a standard GEO antenna. It accesses satellites in geosynchronous orbits or geostationary orbits. Data rates in VSATs ranges from 4 Kbps to 16 Mbps.
Configurations of VSATs
Star Topology − This has a central uplink site which transmits data from and to each VSAT through the satellite.
Mesh Topology − Each VSAT transmits data via the satellite to the other stations. The above diagram shows mesh topology of VSATs.
Combination of the above
Uses of VSATs
In narrowband data − e.g. point – of – sale transactions using debit cards or credit cards, RFID data
In broadband data − e.g. Internet access to remote locations, VoIP
Mobile communications
Maritime communications