Signal Latency in Satellite Broadband

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<h1>Signal Latency in Satellite Broadband</h1><strong> Author: <a href='http://www.articleseen.com/profile_Johnny Diaz.aspx'>Johnny Diaz</a></strong><br /><p>Satellite broadband is loyal--satellites are its only provider using the low-Earth orbit (LEO) satellites and the geostationary satellites, which can offer very fast connection, although unable to reach the polar regions of the planet. These satellites have their own features and limitations that defines their usefulness and performance in specific applications. Signal latency is the delay between requesting data and the receipt of response in two-way communication, and between the actual moment of a signal’s broadcast and the time it is received at its destination. Unlike the ground-based communication, all geostationary satellite communications experience a high level of latency due to the 35,786 km (22,236 mi) distance to a satellite in geostationary orbit and back to the Earth again. This delay is significant even at the speed of light which is about 300,000 km/s or 186,000 mi/s or if all other signaling delays could be removed that a radio signal will still take about a quarter of a second or 250 millisecond (ms) to travel to the satellite and back to Earth. This delay is doubled, the theoretical minimum, before a reply is received for an Internet packet. A typical one-way connection latency of 500-700 ms from the user to the ISP, or about 1,000-1,400 ms latency for the total round trip time (RTT) back to the user when the normal delays are divided by the network sources. A geostationary orbit, or geostationary Earth orbit (GEO) is unsuitable for low-latency applications since it is a geosynchronous orbit directly above the Earth’s equator, with a period equal to the Earth’s rotational period and an orbital eccentricity of approximately zero. The lower speeds of lower orbits are acceptable latencies. For geostationary satellites, there is no way to eliminate latency, but the problem can be resolved, in a way, in Internet communications with TCP acceleration. Its feature is to shorten the RTT per packet by splitting the feedback loop between the sender and the receiver. There is an alternative proposal to the geostationary relay articles and that is the ultralight atmospheric aircraft as satellites. It could fly along a circular path above a fixed ground location, operating under autonomous computer control at a height of about 20,000 m.</p><strong>About the Author:</strong><br />Johnny Diaz Eagan, Minnesotta <a rel="nofollow" href="http://www.newsat.com/VSAT/broadband.html">Satellite Broadband</a><p> Article Source: <a href='http://www.articleseen.com/Article_Signal-Latency-in-Satellite-Broadband_127239.aspx'> http://www.articleseen.com/Article_Signal Latency in Satellite Broadband_127239.aspx</a></p>

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Keywords : satellite broadband signal latency, satellite broadband, signal latency, internet, satellite, broadband, vsat, newsat,

Category : Communications : Broadband Internet