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在我国早期曾把共用天线系统也称为CATV，目前CATV是指有线电视系统。CATV系统包括同轴电缆有线电视、光缆有线电视及光电混合网（HFC）有线电视。载波噪声比简称载噪比，是衡量系统噪声大小的一项指标，它定义为载波功率和噪声功率之比，以分贝表示。在有线电视系统中，阻抗定
Earlier in our country had shared antenna system is also known as CATV, CATV is currently CATV system. The CATV system includes coax cable television, cable cable television and hybrid optical network (HFC) cable television. The carrier-to-noise ratio, abbreviated as carrier-to-noise ratio, is a measure of system noise and is defined as the ratio of carrier power to noise power in decibels. In cable systems, the impedance is fixed