Summary
Increasing demand for broadband communications services has led telecommunications suppliers to develop and improve millimeter waveguides, coaxial cables, and lightwave communications. A key breakthrough in this technology was United Aircraft's Norden Division's development of a radio transceiver for twenty-two and thirty-nine GHz. Development of millimeter wave equipment was encouraged by the FCC with its allocation of frequencies eighteen GHz for local distribution of signals by common carriers in the Domestic Point-to-Point Microwave Radio Service. The potential for high frequency transmission is now being exploited by Digital Termination Systems, which are being used in the new Digital Electronic Message Service, which makes use of broadband local loops. However, lightwave transmission over fiber optic cables has recently become the technology of choice throughout the world. The future of broadband transmission clearly lies in the combination of lasers and fiber optic cable systems. Photographs of fiber optic cables are included.
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Extract
Coax Opens Wideband Market.
Bandwidth became one of the most important considerations in transmission during these two dynamic decades as demands for wideband services increased. First in the laboratories and then in manufacturing, telecommunications suppliers gave much attention to development and improvement of millimeter waveguides, coaxial cables, and lightwave communications.
Prior to the 1960's there was very little work being done on millimeter-wave frequencies, except for some limited experiments conducted by Bell Laboratories and others, and some short-haul communications experiments by some radio amateurs. During CN's first...See the full content of this document
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