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1 概述自从一九四九年在美国出现了世界上第一套CATV系统以来,世界各国都在积极发展。当今国外已从CATV发展成电缆电视系统,比利时全国百分之百的用户都参加了电缆电视系统网。我国自一九七三年研制CATV技术
1 Overview Since the first CATV system in the world appeared in the United States in 1949, all countries in the world have been actively developing. Nowadays foreign countries have developed from CATV into cable television systems. One hundred percent of the users in Belgium have participated in the cable television system network. Since 1973, China has developed CATV technology