Multiplexed data channel controlled telephone system

Details Multiplexed data channel controlled telephone system Multiplexed data channel controlled telephone system

H - Electricity

04

Q

363/3

H04Q 3/58 (2006.01) H04M 1/72 (2006.01) H04M 1/723 (2006.01) H04M 9/02 (2006.01)

Patent

CA 1282506

Abstract of the Disclosure A multiplexed data channel telephone system comprising a master station and one or more remote stations is disclosed. Each station is bridged, in a parallel electrical connection, onto a wire-pair that extends from the stations to a telephone switching system. Each station includes a voiceband line interface for connecting to the wire-pair at voiceband frequencies, and a radio frequency line interface for connecting to the wire-pair at radio frequencies. Each station further includes multiplexer and demultiplexer equipment for frequency shifting a data channel between baseband and rf. Amplitude modulation and half-duplex transmission are used in the data channel. Telephone status and control information, including ringing and answer control, are exchanged between processors via the data channel. Remote stations minimize the amount of equipment required by using the data channel to control common equipment at the master station that interacts with incoming telephone lines.

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