Download 06.Broadcasting by John G. Webster (Editor) PDF

By John G. Webster (Editor)

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CABLE TELEVISION ENGINEERING The Headend Program Sources Satellite Relay. Most cable television programming is relayed by satellite to the headend. Geostationary satellites are maintained in orbit at 35,786 km directly above the equator. The geostationary orbit is defined so that the satellite velocity exactly matches the earth’s rotation, and the satellite appears to be stationary. In accordance with international agreements, national authorities assign each satellite to a specific longitude, or orbital slot, often separated by no more than 2Њ.

HFC architecture, showing both generic ring and star fiber topologies. A growing number of programs are being relayed by satellite to cable TV headends in compressed digital format for distribution to subscribers. Terrestrial broadcasting in accordance with the recently adopted rules for digital television (DTV) has already begun at two locations on an experimental basis. By 1996, 93 million households had access to cable television, representing 97% of all television households. Moreover, 63 million, or 65%, of those households are paying subscribers.

A growing number of programs are being relayed by satellite to cable TV headends in compressed digital format for distribution to subscribers. Terrestrial broadcasting in accordance with the recently adopted rules for digital television (DTV) has already begun at two locations on an experimental basis. By 1996, 93 million households had access to cable television, representing 97% of all television households. Moreover, 63 million, or 65%, of those households are paying subscribers. 4 million plant miles of coaxial cable installed, with an estimated 562,000 miles of fiber in place, along 28,000 route miles.

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