Transmission line for electrical signals. It is an indispensable transmission medium in various electronic systems. Telecommunications cables are used in all areas of electronic technology.
The earliest telecom cable was the English Channel submarine telegraph cable that was laid between Dover, England and Calais, France in 1851. It is insulated with copper conductor and Malay rubber. It uses seawater to form a return conductor and successfully transmits telegraph signals within a distance of 40 km. A paper insulated multi-log telephone cable appeared in 1892. Since the 20th century, carrier-symmetric cables with 3, 12, 24 and 120 telephones have appeared. In order to meet the needs of the large increase in communication capacity, the coaxial cable was invented in 1929, and 480 voice channels and 1800 voice channels were opened. By the 1980s, 10,800 telephones have been opened, and the maximum frequency of use has reached 60 MHz. In the 1920s, RF cables were used to replace the overhead parallel two-wire or hard coaxial tubes used in early radio stations as transmitter-to-antenna feeders. After the Second World War, due to advances in electronic technology and the emergence of high-frequency media such as polyethylene and polytetrafluoroethylene, the variety of RF cables increased and performance improved. In response to the requirements of computer, nuclear technology and aerospace technology development, modern cables have unique structures and special properties, such as light-weight, small-sized ribbon cables, radiation-resistant, high-temperature cables and low-noise cables. New varieties.
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