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ObjectiveThere are two major types of communications Terrestrial and Satellite communications In general we need a communications satellite for two stations can contact each other when conventional means cant provide When we have two stations on earth that want to communicate together but they are too far apart we use a satellite in orbit as a relay station to connect the two The process when one ground station transmits information to the satellite is called an uplink The satellite amplifies and converts the information then sends it back to the other ground station which is called a downlink Like any technology satellite communication has its advantages and disadvantages The biggest and most important advantage of satellite communication over terrestrial communication is that it has a very large coverage much greater than terrestrial communications In addition the transmission cost of a satellite is independent of the distance from the center of the coverage area Its also much more precise and has more bandwidth available to use Some of the disadvantages of this technology are that its much more expensive because its costly to launch a satellite in orbit Also it has a larger propagation delay than terrestrial communicationsThere are various applications to use satellites in satellite communications There are three services available Fixed Satellite Services FSS Broadcast Satellite Services BSS and Mobile Satellite Services MSS An example of Fixed Satellite Services is point to point communications where the ground terminal is stationary Broadcast Satellite Service is contained in FSS the only difference is that it is a point to multi-point communications An MSS application is a satellite phone where the ground terminal is non-stationary Having the earth terminal mobile doesnt allow using a simple line-of-sight link unlike Fixed Satellite and Broadcast Satellite ServicesMobile Satellite Service MSS provides a telecommunication service beyond the ranges where other communication networks are not available MSS enhances mobile to stationary and mobile to mobile voice and data communications MSS works
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