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一、引言有线电视网络（CableTelevisionNetwork，简称CATV网）是近年来发展十分迅速的广播电视传输网络。以上海为例，截止1996年底，有线电视的用户数已达到180多万户，预计到2000年，将达到380万户；全国已有1052个CATy网，约有2－3亿人口观看有线电视。通过CATV网把多媒体
I. Introduction Cable TV network (CableTelevisionNetwork, referred to as CATV network) in recent years the rapid development of radio and television transmission network. Take Shanghai as an example. By the end of 1996, the number of cable television subscribers had reached more than 1.8 million and it is estimated that 3.8 million will be reached by 2000. There are 1,052 CATy networks in the country with about 2-3 billion people watching cable television . Through the CATV network to multimedia