Creating An Animated GIF Using Macromedia Fireworks
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Creating Swap Images In Fireworks
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Internet

satellite Internet connection is basically an arrangement in which the upstream (outgoing) and the downstream (incoming) data are sent from, and arrive at, a computer through a satellite. Each subscriber's hardware includes a satellite dish antenna and a transceiver (Modem) that operates in the microwave portion of the radio spectrum. Your computer, through the satellite modem, broadcasts requests to a satellite dish antenna that sits on top of your home or business. The dish antenna then sends and receives signals from satellites that orbit some 22,300 miles above the equator. As long as your dish maintains a clear view of the southern sky (in the U.S.), you receive broadband Internet access. Currently, satellite broadband is slower in both the uplink and downlink, when compared to a DSL Internet service, for example.

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The nature of the satellite internet connection is good for web browsing and for downloading of files. Because of long latency compared with purely land-based systems, interactive applications such as online gaming are not compatible with satellite networks. In a two-way geostationary-satellite Internet connection, a transaction requires two round trips between the earth's surface and transponders orbiting 22,300 miles above the equator. This occurs in addition to land-based data transfer between the earthbound satellite system hub and the accessed Internet sites. The speed in such a connection is theoretically at least 0.48 second (the time it takes an electromagnetic signal to make two round trips at 186,000 miles per second to and from a geostationary satellite), and in practice is somewhat longer. Satellite systems are also prone to rain fade (degradation during heavy precipitation) and occasional brief periods of solar interference in mid-March and late September, when the sun lines up with the satellite for a few minutes each day. Rain fade and solar interference affect all satellite links from time to time, not just Internet systems.

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