Power line communications is a viable medium for sending and receiving information, which includes voice, data, music, video, Internet access, networking, and many other applications. PLC uses an already existing infrastructure, the A/C power lines, for distribution of these types of signals without adding new wiring to the home or small office. Because of the existing infrastructure and lack of high frequency RF components or antennas, this method for sending and receiving information appears offer the lowest cost and the best coverage at the present time. Nearly all types of modulation schemes can be used for sending and receiving signals over the power line; however, for high speed, reliability, and security, digital modulation is the preferred method. These digital modulation schemes along with parallel OFDM type techniques provide the demands for broadband communications and home and small office networking. Standards regarding the interoperability of multiple devices are in place to prevent interference and jamming between users. These standards are being modified and upgraded as the technology and higher data rates are being incorporated. Different frequency bands are being used for different purposes; spread spectrum and adaptive systems are being designed in order to co-exist and for interoperability. The advantages of a power line communication system far outweigh the disadvantages.