The feeder automation system adopts wired relay communication to realize the communication between substations and each FTU, between substations, and between substations and the main station. The four-frequency multiplexing FSK digital modulation system is used to realize multi-channel and multi-type communication on one line through the reasonable allocation of four subcarriers. This paper focuses on the analysis of the basic principles of information transmission in the communication network, the process and implementation method of modulation and demodulation of information in the line transceiver. Keywords : FA FSK wire communications MODEM Abstract: The feeder automation (FA) system is based on relayed wire communication in order to achieve communication between substation and every FTU, and each substation, and the main station. Using four-frequency reuse FSK digital modulation technology and properly adjusting the four carrier waves, this paper describes how to realize multi-route and multi-kinds signals transmit within a communication line in the feeder automation system. It emphasized on the transmission principle of the information in the communication net, and emphasized on the realization method how to modulate and demodulate in the line transceiver.Keywords : FA FSK wire communications MODEM
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