The PLC is a system to connect the Ethernet network using the common electrical cable into any home or office. Take the electric network into a digital network that transmits data at almost the same speed as if a network cable is connected. It is a technology that is catching many followers by ease of installation, as between the two PLC is not necessary to use any network cable. The PLC systemHomePlug connects two, where one of them is connected by a cable to the network and the other is connected to a computer or other device via the network cable. The PLC converters transmitted in range of medium and high frequents. Asymmetric speed can reach 2.7 Mbit/s.

PWM technically be the pulse-width modulation (also known as PWM stands for pulse-width modulation) of a signal or energy source. It is a technique in which the duty cycle of a periodic signal (a sine or a square, for example) is modified, either for transmitting information through a communications channel or to control the amount of power that is sent to a load. Pair