The Research Of Home Network Technology Based On PLC

Powerline communication has been developed for years. With low frequency (9-490kHz), Powerline carrier communication on middle-voltage or high-voltage electric grid (above 35kV) is used to transmit low speed data or voice. On the low-voltage electric grid, PLC technology is mainly used to control load, remote reading meter and home automation. Because its transmission speed is usually 1200bps or lower speed, it is called low-speed PLC. The powerline communication technology with 1Mbps or higher speed is used to be called high-speed PLC. Because great development of technology, good products are provided to market in recent years. In this field, the representative chipset manufacturers are Intellon company in America, Easyplug company in French, ITRAN company in Israel, DS2 company in spain. Typical device manufacturers are ASOKA company in America, Xeline company in Korea, ASCOM company in Switzerland. With development of network technology and multimedia technology, high-speed PLC network which is connected to internet and transmission technology of multimedia become the current research hot-point. The relative research and application are made great improgress overseas.With high-speed powerline product, bandwidth with 14Mbps speed is provided for user terminal to realize PLC network in resident district. Comparing with other network method, PLC technology is more advantageous to set up family or office LAN.The PLC family network system in this article includes three sections:1,PLC host control device. PLC host control terminal includes two sections:host control terminal interface circuit and powerline coupling circuit.The main function of PLC host control terminal is to complete the transfer between ethernet data package and powerline data package, to modulate or demodulate OFDM signal, and to couple signal to powerline.2,User terminal device. By user terminal device, home computer can send network information to powerline. After receiving network information from powerline, host control terminal transfers the information to internet by modem. The information returned from internet servers is sent to host control terminal which sends the information to powerline network. Meanwhile, user terminal can receive the return information from the other end of powerline network, transfer the information to family computer, and realize PLC network.3,Human-computer interaction function. This function is provided with an embedded web interface.With the web interface, user can manage device conveniently such as IP setting of the device, setting of gateway and subnet mask, setting of password, filtering of MAC address and etc.China is with the biggest eletric grid in the world. If we can use the wide-covered 220V low-voltage powerline to transmit high speed data, it must be the best method to resolve'the last one kilometer'. At the same time, it could break the monopolization of local network companies, and provide PLC industry operator with powerful technology weapon to compete with other operators.