Download - Cable TV
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Cable TV
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Acquisition of Signals
Cable Began as Community Antenna TV (CATV)Large tower antenna captures
broadcast signals and retransmits over wire to community
Obtains distant signals (via land line, antenna, microwave, satellite) Superstations
Adds non-broadcast content Cable-exclusive content providers
(e.g., HBO, CNN) including “Pay” TV
Local programming
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Technology
Headend Trunk cable Distribution of feeder cable Subscriber drop Terminal equipment
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Traditional Network Tree
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Coaxial Cable
Bandwith (750 MHz) cable can carry more
channels than b’cast
Industry has not generally exploited this featureexception: subscription services (pay, scrambling)
DuplexCoax carries signals in both directions
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Hybrid Fiber/Coax TV System
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History
Frank Jewett (1936) Coaxial Cable installed between New York and
Philadelphia Louis H. Cook (1937)
Patent to send pictures over a wire CATV – Community Antenna Television(1948)
Tap in to a coax cable connected to a large antenna Charles Dolan HBO (1965-1972)
Used a satellite to make novel service available to cable companies
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Modern Era
1980 – Switch in who paid whom vis-à-vis programmers and operators
1987 – Majority of people get TV via cable 1992 – Cable Communications Consumer
Protection and Competition act of 1992 Cable companies had to stop gouging
Telecommunications Act of 1996 Telephone companies allowed to get into the act
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Current Era
By 2000 68% of homes had cable tv Direct Broadcast Satellite presents
competition Fiber Optic compression enables cable
company to transmit 12 signals where it used to be able to transmit one
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Video Channels in the Home
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Recent Activity
Digital Upgrades High Definition TV Interactive Services
Video on demand Subscription video on demand Interactive program guides Enhanced TV services Digital video recorder