a basic cable system works as follows information is received

  via satellite from the information providers also known as a

  channel in what is known as a head end where they process the

  signal and insert it into qualms which leave the head end on fiber

  optic cable by laser till it gets to the neighborhood or

  neighborhoods where there are subscribers. the fiber optics then

  hit what is called a node. at the node a fiber optical receiver

  changes it from light into db which is then sent out on

  distribution style coaxial cable usually a plastic based coating

  quantum reach style cable or qr cable. it then hits an amplifier

  where it is jumped up to about 40 db give or take as it travels

  down the street. where there is a house there is a tap in the qr

  cable, which is where the coaxial cable people are most familiar

  with starts

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