The transmission of TV programs into the home and office via
coaxial cable. The first cable TV dates back to the late 1940s,
when antennas were located at the highest point in a community
to deliver TV to areas that had difficulty receiving over-the-
air broadcasts (see CATV).| From TV to Internet to Telephony
Since the cable companies were already wired into millions of
homes, they had great success selling Internet access to its
subscribers, starting in the late 1990s. Unlike the telephone
company's DSL service, Internet access via the cable
infrastructure does not have distance limitations. Cable TV
companies later added telephone service to offer the "triple
play" (data, voice and video service). See cable Internet. Many
Analog and Digital Channels Cable TV typically transmits 125 6
MHz channels using frequency division multiplexing (FDM) to its
subscribers. Each channel can hold one analog TV program, three
high-definition (HD) digital programs or 10 standard definition
(SD) digital programs. The digital