. Bell telephone magazine . placed in the years ahead. Rapid strides have been made in the use of com-munications satellites since the Bell System launchedits Telstar® satellite five years ago. But even thoughAT&T is the largest user of satellite circuits in theworld, underseas cables continue to serve as theworkhorse of international communications. The need for fail-safe communications, coupledwith steadily rising calling volumes, is the reasonfor the continuing use of both cables and satellites,as well as improved radio-telephone circuits. No single means of transmission can carry theburden
. Bell telephone magazine . placed in the years ahead. Rapid strides have been made in the use of com-munications satellites since the Bell System launchedits Telstar® satellite five years ago. But even thoughAT&T is the largest user of satellite circuits in theworld, underseas cables continue to serve as theworkhorse of international communications. The need for fail-safe communications, coupledwith steadily rising calling volumes, is the reasonfor the continuing use of both cables and satellites,as well as improved radio-telephone circuits. No single means of transmission can carry theburden of overseas communication alone, says C. C. Duncan, AT&T assistant vice president for over-seas communications. The key to dependable inter-national communications is diversity. Satellite, under-sea cable and radio-telephone circuits are the ingre-dients of this necessary mix—and will continue to bein the foreseeable future. Protecting cables by bury-ing them is an important advance for one of
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