Importance

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Abstract

A telephone line carrier system comprising a master station (221) and one or more remote stations (222) is disclosed. Each station (221, 222) is bridged, in a parallel electrical connection, onto a wire-pair (201) that extends from the station to a telephone line switching system. Each station (221, 222) includes a line interface (110, 310) for connecting to the wire-pair (201) at voiceband frequencies, and a radio frequency interface (700, 800) for connecting to the wire-pair (201) at Radio Frequencies (RF). Each station further includes multiplexer and demultiplexer equipment (500, 600) for frequency shifting voice and data channels between baseband and RF. Frequency modulation and full duplex transmission are used for voice communication while amplitude modulation and half-duplex transmission are used for data communication. The master station (221) terminates a second telephone line (202) and frequency multiplexes/demultiplexes signals between the second telephone line (202) and the wire-pair (201) thereby providing remote stations with access to the second line. Telephone status and control information, including ringing and answer control, are exchanged between controllers (160, 360) via the data channel.

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First Claim