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| Undersea cable ： ウィキペディア英語版 |
Submarine communications cable
A submarine communications cable is a cable laid on the sea bed between land-based stations to carry telecommunication signals across stretches of ocean. The first submarine communications cables, laid in the 1850s, carried telegraphy traffic. Subsequent generations of cables carried telephone traffic, then data communications traffic. Modern cables use optical fiber technology to carry digital data, which includes telephone, Internet and private data traffic.
Modern cables are typically about in diameter and weigh around 1.4 kilograms per metre (0.4 lb/ft) for the deep-sea sections which comprise the majority of the run, although larger and heavier cables are used for shallow-water sections near shore.
〔("How Submarine Cables are Made, Laid, Operated and Repaired" )〕
〔("The internet's undersea world" ) – annotated image, ''The Guardian''.〕 As of 2010, submarine cables link all the world's continents except Antarctica.
==Early history: telegraph and coaxial cables==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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