Multiplex communications – Wide area network – Packet switching
Patent
1987-02-02
1989-02-21
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 691, 370 76, H04J 102, H04J 114
Patent
active
048072257
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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American Telephone and Telegraph Company, AT&T Technologies, Inc
Morra Michael A.
Olms Douglas W.
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