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- Satellite TV Providers and
Programming
- Satellite TV providers get programming from two
major sources: national turnaround channels (such as HBO, ESPN and CNN) and various local channels like NBC, CBS,
ABC, PBS and Fox affiliates in a specific area.
Most of the turnaround channels also provide programming for cable television, and the local channels typically
broadcast their programming over the air.
Turnaround channels usually have a distribution center that beams their programming to a geo-stationary satellite.
The broadcast centers uses large satellite dishes to pick up these analog and digital signals from several sources.
Most local stations don't transmit their programming to satellites, so the provider has to get it another way.
If the provider includes local programming in a particular area, it will have a small local facility consisting
of a few racks of communications equipment.
The equipment receives local signals directly from the broadcaster through fiber-optic cable or an antenna and
then transmits them to the central broadcast center.
The broadcast center converts all of this programming into a high-quality, uncompressed digital stream. At this
point, the stream contains a vast quantity of data -- about 270 megabits per second (Mbps) for each channel.
In order to transmit the signal from there, the broadcast center has to compress it.
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