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电缆通常是由几根或几组导线[每组至少两根]绞合而成的类似绳索的电缆，每组导线之间相互绝缘，并常围绕着一根中心扭成，整个外面包有高度绝缘的覆盖层。多架设在空中或装在地下、水底，用于电讯或电力输送。1832年，沙俄退伍军官许林格将电报线路埋在地下，六根导线之间彼此用橡胶绝缘后同放在玻璃管内，这就是世界上最早的一条地下电缆。

SARFT: Gradually Implementing a Remote Control for Watching TV

It is reported that cable TV, IPTV and Internet TV have all strengthened the supply of high-quality free content.

http://en.c114.com.cn/576/a1253799.html - 原创 - English - 2024-1-25

National Fiber Optic Cable Production Reaches 246 Million Fiber-kilometers in the first three quarte

According to data from the National Bureau of Statistics, the cumulative production of fiber optic cables in the first three quarters of 2023 reached 246 million fiber-kilometers, representing a year-on-year decrease of 7.7%.

http://en.c114.com.cn/579/a1246281.html - 原创 - English - 2023-10-26

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SARFT: Gradually Implementing a Remote Control for Watching TV

National Fiber Optic Cable Production Reaches 246 Million Fiber-kilometers in the first three quarte