Multi-line telephone system

Details Multi-line telephone system Multi-line telephone system

1984-08-29

1986-12-23

Lev, Robert G.

Telephonic communications

Multi-line or key substation system with selective switching...

With special service

379162, 379164, H04Q 520

Patent

active

046313672

ABSTRACT:
A multi-line, multi-instrument telephone system having no key service unit and wherein decentralized or local indicator lamp and paging circuit management functions are provided which are operative independently in each station set to operate and control the indicator lamps and paging circuits through selective local generation and alteration of control signals and comparison of the control signals with locally generated reference voltage signals to provide basis for decisions on required visual and audible indicator status. The system is connected in loop fashion with each instrument being connected across a common, multiconductor buss wherein a single conductor supports lamp supervision signaling for the multiple lines and another single conductor supports intercom status signaling, intercom audio, paging audio, and the ring signal.

REFERENCES:
patent: 3723971 (1973-03-01), Betts et al.
patent: 3781478 (1973-12-01), Blahut et al.
patent: 4004106 (1977-01-01), Yachabach et al.
patent: 4013844 (1977-03-01), Saxon
patent: 4021622 (1977-05-01), O'Neill et al.
patent: 4024353 (1977-05-01), Hijikata
patent: 4029909 (1977-06-01), Hinkle
patent: 4039757 (1977-08-01), Frisone
patent: 4064373 (1977-12-01), Pinede et al.
patent: 4071712 (1978-01-01), Barsellotti
patent: 4079212 (1978-03-01), Sasai
patent: 4080517 (1978-03-01), Moricca et al.
patent: 4088846 (1978-05-01), McEowen
patent: 4093830 (1978-06-01), Pappas
patent: 4101741 (1978-07-01), Kunstatter
patent: 4144410 (1979-03-01), Flickinger et al.
patent: 4150260 (1979-04-01), Kamata
patent: 4185173 (1980-01-01), Kerman et al.
patent: 4198547 (1980-04-01), Ferraro
patent: 4207439 (1980-05-01), Saxon
patent: 4214130 (1980-07-01), Questad
patent: 4220827 (1980-09-01), Burke et al.
patent: 4223186 (1980-09-01), Hartman
patent: 4243844 (1981-01-01), Waldman
patent: 4260857 (1981-04-01), Shinoi et al.
patent: 4280022 (1981-07-01), Sekiguchi et al.
patent: 4292474 (1981-09-01), Morrell et al.
patent: 4323734 (1982-04-01), Kimzey
patent: 4327256 (1982-05-01), Crooks et al.
patent: 4347409 (1982-08-01), Ogawa et al.
patent: 4347605 (1982-08-01), Hashizume et al.
patent: 4374308 (1983-02-01), Holesha
patent: 4380688 (1983-04-01), Simokat
patent: 4381427 (1983-04-01), Cheal et al.
patent: 4382163 (1983-05-01), White et al.
patent: 4408102 (1983-10-01), Lumpkin
patent: 4410767 (1983-10-01), Sekiguchi
patent: 4417242 (1983-11-01), Bapst et al.
patent: 4490583 (1984-12-01), Beomarz et al.
patent: 4511767 (1985-04-01), Wetzel et al.
patent: 4588861 (1986-05-01), Teich

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