A data communication system is disclosed including a cable medium and modulator adapted to carry data and power between a high speed data source and a high speed data sink. Based on the brightness frequency data, the number of subfields for emission at each brightness in a brightness region is adjusted for each of at least two brightness regions. The wire section and the remote control section are connected when the pipe is pinched by the pinching mechanism, and the wire section and the remote control section are separated when the pipe is released from the pinching mechanism.