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Internet has entered in our lives in a big way, from sending mails, reading the news, to the booking of tickets on-line, it has a special role in every onepsilas life. There is a great need in the near future to take the Internet to the remote places in our country, where network infrastructure is not in place. Many efforts are made in this direction and one of the technologies enabling this is the power line communication (PLC). The idea is to put information signals on to the power line, which is existing in most rural places. Hence the additional network cabling cost is saved. This paper describes the PLC technology, physical layer protocols, MAC layer and security issues. Two major challenges faced by PLC are the presence of noise and the security issues since power line is a broadcast medium. This paper analyses and simulates the noise model in power line communication systems.