OPoLiCom is a system that continuously monitors the access impedance over frequency. If the access impedance spectral density below a threshold value in the respective frequency range no power is fed. Since the maximum power consumption of a PLC transmitter is limited it ensures that in the frequency ranges with sufficiently high access impedance sufficient power can be fed. This is necessary for a good signal-to-noise ratio. By using OFDM with strong channel coding as in the just now standardized method the absence of a portion of transmission frequencies can be compensated without any information to the receiver. This allows a standard-compliant implementation.