At one of network constitution methods of the CATV net, the optical fiber and the combination the cable of the same axis. With the standard below of CATV after the nineties middle, through the photoelectricity converter to the basic part making use of the optical fiber, the coaxial cable is used to retreat of the user house. Because with the former CATV net the coaxial cable is used for also the basic part, in offer of bidirectional high-speed Internet service installation of the relay amplifier and use etc of the cable modem which decreases the flow combination noise in rising direction were necessary.
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