In additional to transmitting power, distribution power lines are used as communication media for controlling distant switches, load management, meter reading and so on. In this communication, a ripple control (RC) system has been used in remote areas as usual. Nowadays the RC system has been replaced by a chirp signal system, which is one of spread-spectram (SS) systems, in this communication in Kyushu area. Transmission speed and reliability of this communication are improved by this system. In this paper, we discuss a background of a distribution power line and the SS-chirp signal system on this line.
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