Multiplex communications – Wide area network – Packet switching
Patent
1983-12-22
1986-01-14
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 57, 370 67, 370 73, 3701101, H04Q 1104, H04J 702
Patent
active
045649405
ABSTRACT:
A signal multiplex transmission system has predetermined work stations included in a plurality of terminal units which respectively process data in predetermined forms, and a private branch exchange or PBX. A transmission line is connected between the predetermined work stations and the PBX to commonly transmit frequency-multiplexed data from the PBX to the predetermined work stations. A separation filter separates first multiplexed signals supplied from the predetermined work stations from second multiplexed signals from other work stations and supplies the separated first multiplexed signals to the PBX independently of the second multiplexed signals, which signals are amplified by an amplifier. A mixer is connected to the PBX, the amplifier and a reception line. The first and second multiplexed signals are mixed by the mixer, and composite data is sent onto the reception line. The signal lines are used to transmit the multiplexed signals having the same frequency band.
REFERENCES:
patent: 3701851 (1972-10-01), Starrett
patent: 3860873 (1975-01-01), Rigstad
patent: 4127820 (1978-11-01), Beelitz et al.
patent: 4288868 (1981-09-01), Grotjohann et al.
patent: 4425642 (1984-01-01), Moses et al.
patent: 4446564 (1984-05-01), Pierce
patent: 4479213 (1984-10-01), Galand et al.
New "Switchless" PABX Uses Coax, FDM to Offer Voice, Video, Data, Control; Stout et al., Mar. 1978.
Kuntz Curtis
Olms Douglas W.
Tokyo Shibaura Denki Kabushiki Kaisha
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