In order to provide reliable communication facilities, VSAT based satellite communication network for communication activities such as voice, facsimile, data and internet transactions has been installed at the Project. The unique feature of communications satellite is their ability to simultaneously link all users on the earth's surface, irrespective of their locations, thereby providing distance-insensitive point-to-multipoint communications. Also, with satellites, bandwidth capacity can be dynamically allocated to users. These features make satellite communication systems unique in design. The satellite communication technology offers many benefits and advantages over the conventional terrestrial networks, including lower operating costs, ease ofinstallation and maintenance, support for multi-services, the ability to bring locations where the cost of leased lines is exorbitant into the communications loop and the integration of different locations into a network. These features make it ideal forcommunication with hydropower projects which are located at remote sites. The Vsat communication system is envisaged to be developed for full scale networking applications for interconnecting PCs and PC-based LANs. PC traffic varies depending on applications. Corporate communications such as facsimile transmission, electronic mail, data collection, file transfer, computer-aided design, SCADA systems, project monitoring through video-conferencing, and so on are bulk data traffic that may last several seconds to minutes or even hours. The satellite-based networks are best suited for bulk data traffic. These characteristics are again very useful during construction and operation of remotely located hydropower projects for effective and timely controls. The salient features of the closed user group (CUG) Vsat system for various applications including SCADA and project monitoring are described in the paper. Important conclusions regarding different uses of the VSAT satellite communication system are alsodiscussed in the paper.
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