. Bell telephone magazine . Jim Griffin, who has the job of planning future TVtransmission facilities. Physically, theres just one nationwide network:that of the Bell System. Imagine a map of the UnitedStates with an enormous spider web spun across web is our network. Into it we can weave anybroadcasters geographical coverage. Take a typical Sunday during the football season,for example. One minute CBS has circuitry taking anNFL game all over the country. At an appointed in-stant in time, we dissolve that hookup into 23 re-gional pieces, so local stations can show local orregional comm
. Bell telephone magazine . Jim Griffin, who has the job of planning future TVtransmission facilities. Physically, theres just one nationwide network:that of the Bell System. Imagine a map of the UnitedStates with an enormous spider web spun across web is our network. Into it we can weave anybroadcasters geographical coverage. Take a typical Sunday during the football season,for example. One minute CBS has circuitry taking anNFL game all over the country. At an appointed in-stant in time, we dissolve that hookup into 23 re-gional pieces, so local stations can show local orregional commercials: snow tires in Maine, swimsuits 28 in southern California, budget air fares in New seconds later, we put the whole thing backtogether and the game goes on. To me, the wholetransmission system is a kind of harpsichord on whichwe can play anybodys favorite tune. Leaning forward and folding his big hands beforehim on the desk, Jim says, Weve got to have thecapacity. Who else could be expected to have 600,000. channel miles of communications circuits: 350,000miles of voice and data channels; 125,000 miles ofTV-carrying capacity; and another 125,000 miles ofprotection channels, also TV-grade. Protection circuits provide reliability The idea of protection capacity is expanded byBob Miller, who helps manage the big Long Linesswitching center at 32 Avenue of the Americas. Here,and at similar locations in Atlanta, Chicago and LosAngeles, the actual switches are thrown that makeand dissolve the national TV circuits. The word protection means what it says, Millersays, his voice hardening a little with recollectedemergencies. We need reliability in the face offloods, hurricanes — even rockslides on the moun-tains where our microwave towers sit. Miles McCosker, who works on Millers staff —around the clock when necessary — adds, We alsouse the protection capacity to meet big demands likethose football Sundays, in addition to CBS, NBC tele-vises the whole American Foo
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