Patent ID: 7885633

Claim:
A method for operating a communication arrangement including a plurality of PLC modem devices, comprising: for each of said PLC modem devices: a presence of interferences caused by operating other PLC modem devices, caused by a communication line used for own power line communication and/or from operating radio services, is monitored, and in the case that interferences from said operating other PLC modem devices, from said communication line used for own power line communication and/or from said operating radio services, are detected, power line communication is at most or essentially performed on communication channels or communication spectra where said interferences from other PLC modem devices or from radio services are not detected, thereby simultaneously avoiding interferences to and from other PLC modem devices and radio services, wherein a pre-defined reference signal is generated by at least one PLC modern device and transmitted via at least one available communication channel, wherein possible communication partner devices measure said pre-defined reference signal via channels other than said available communication channels and/or analyze the respective measurement data, wherein based on said measurements said communication quality data, said communication spectrum data, said communication channel data, said communication spectrum and/or said communication channel are chosen or selected, thereby by fair avoidance avoiding and de-allocating at least one of communication spectra and communication channels associated with at least one of amateur AM and DRM radio services.