Set-Top Boxes
Cable TV set-top boxes are interfaces between televisions, satellite TV and cable TV networks for access to television and other services. At the most basic level, they are tuners. Cable and satellite TV operators remotely administer filters and traps in set-top boxes to allow subscribers access to basic cable TV or premium channels. The set-top box also has a security function. It scrambles and unscrambles TV signals and also has links to billing systems for information on which channels to allow the subscriber to receive. Credit information is also stored in some set-top boxes.
Digital set-top boxes are available to take advantage of the two-way capability of digital cable TV and satellite TV. These capabilities include:
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