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有线电视（CATV），是指以电缆、光缆为主要传输媒介传送电视节目的信息系统。随着电子技术的不断革新和社会的不断进步，信息已成为现代社会的基础资源之一。有线电视正是在这种信息革命的背景下出现和发展起来的。1948年，世界上第一个共用天线系统在美国宾夕法尼亚州出现，
Cable television (CATV) refers to the cable, cable as the main transmission medium to send television programs information system. With the constant innovation of electronic technology and the continuous improvement of society, information has become one of the basic resources of modern society. It is in the context of this information revolution that cable television emerged and developed. In 1948, the world’s first shared antenna system appeared in the United States of Pennsylvania,