Broadcasting Telecasting (Apr-Jun 1957)

Record Details:

Title:
Broadcasting Telecasting
Date:
Apr-Jun 1957
Publisher:
Washington, D.C. : Broadcasting Publications Inc.
Volume:
Broadcasting Telecasting
Leaf #:
000249
Language:
English
Subjects:
radio and television periodical, Broadcasting -- United States -- Periodicals
Collection:
Broadcasting & Recorded Sound
Format:
Periodicals
Contributor:
Library of Congress, MBRS, Recorded Sound Section
Sponsor:
Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division
Coordinator:
Media History Digital Library
Date Added:
June 13, 2024
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Meet the Bell System's new guardian of microwave transmission quality Bell System automatic protection switching substitutes a spare channel when interference occurs during transmission. B. C. Bellows, a designer of the system, checks terminal indicating equipment. There's a new watchman on duty along Bell System microwave channels, protecting your transmissions against fading and equipment failures. Its name— automatic protection switching. Its reflexes are so fast that it prevents failures before T\ audiences are even aware of the trouble. It works this way: When a channel encounters trouble, a spare (or protection channel) is automatically switched so as to parallel the troubled channel; both then carry the same signal. At the receiving end, Bell System equipment determines which of the two signals — regular or spare — is better, and relays it on. The entire series of events takes less than onetwentieth of a second. This development is one more example of how the Bell System is constantly finding new and better ways to serve the broadcasting industry. BELL TELEPHONE SYSTEM Providing intercity channels for network television and radio throughout the nation Broadcasting Telecasting April S, 1957 • Page 89