Cable Television, System Technology Of
In its concept, the technology of cable television is relatively simple. It is a system of wires and amplifiers used to gather television and radio signals from a variety of sources and deliver them to the homes in a given geographic area. It is sometimes compared with the water system of a city, which takes water from one or two primary sources and distributes it to customers throughout the city. Cable television similarly distributes a roster of television channels to all the residents of an area who connect to its wire. Cable systems are expanding their services to include high-speed Internet access and traditional telephone service as well. The fundamental components of a cable system include the main office of the local system, called a "headend," where the various signals are gathered, combined, and fed out into the system; fiber-optic lines and coaxial cables, the wires that carry the information; amplifiers that boost the signal at regular intervals and maintain signal strength; and often set-top boxes, which translate the cable signals into electronic information that the home television set can use.
The Headend
The process of getting programming to the home begins far from the headend of the local system.
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