Rabu, 17 Desember 2014

Excess Media Satellite

Excess Media Satellite, namely: 1. Connection anywhere. No need to LOS (Line of sigth) and there is no problem with distance, 2. Reach broad scope of national, regional and global, 3. The relatively rapid infrastructure development for large areas, compared to terrestrial, 4. Communication can be done either point to point or from one point to many points in broadcasting, multicassting, 5. Bitrate high and wide bandwidth access, 6. VSAT can be installed anywhere for entry in satellite range, 7. Reliable and can be used to connect voice, video and data, by providing a wide bandwidth, 8. If the access network to the Internet directly to the ISP / NAP router with reliability approaching 100%, 9. Very good for sparse population density areas and does not have any telecommunications infrastructure. Satellite Media deficiency, namely: 1. The amount of throughput will be limited due to the propagation delay of a geostationary satellite. Now a variety of techniques already developed link protocol that can overcome these problems. Including the use of Forward Error Correction which ensures a small probability of retransmition, 2. Time required from one point on Earth to another point through the satellite is about 700 milliseconds (latency), while leased lines only takes about 40 milliseconds. This is caused by the distance that must be taken by the data that is from the earth to the satellite and back to earth. Geostationary Satellite own altitude of about 36,000 kilometers above the Earth's surface. 3. Highly sensitive weather and high rainfall, higher frequency signals are used, the higher attenuation due to rainfall. 4. Prone lightning strike.

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