Abstract: A plurality of communication stations is interconnected by conductors. Each station includes a transmitter and a receiver as well as control means. The transmitters transmit on any of several frequency bands, each such band being assigned to the receiver of a remote station. A signal generator interconnects the stations and generates intervalled pulse trains upon which the control means of the stations operate to impress coded control pulses. The stations include novel phase locking and phase detecting circuits.

Abstract: A plurality of communicating stations have transmitters, receivers and control means. The transmitters are tunable across a broad radio frequency spectrum and transmit an amplitude modulated selected carrier frequency. Each receiver is set to receive only one preselected amplitude modulated carrier frequency fixed and identified with each particular station. Stations may be regarded as telephones having signaling means and a chassis. The control means includes means to receive TDM control signals from and to supply TDM control signals to a remote common equipment unit. The control signals and amplitude modulated carriers are sent and received over common cabling. The common equipment unit includes processor means to process and generate control signals and means to interface with an external telephone system.