Time-division telephone system embodying trunks having demodulat

Details Time-division telephone system embodying trunks having demodulat Time-division telephone system embodying trunks having demodulat

1976-07-06

1978-06-27

Brown, Thomas W.

179 18BC, 179 18BF, H04J 302, H04M 356

Patent

active

040976947

ABSTRACT:
A telephone exchange system for use within a building or for interoffice communication capable of having a large number of telephone sets utilizing relatively few trunk lines and a compact central station, said system employing time division circuitry and means on each telephone set for effecting the type of communication desired as for instance conference communication with one or more other telephones, paging in a specific area or areas or paging throughout all areas.

REFERENCES:
patent: 3581016 (1971-05-01), Martinelli et al.
patent: 3643030 (1972-02-01), Sparrendahl
patent: 3728492 (1973-04-01), Cappetti et al.
patent: 3757053 (1973-09-01), Pell et al.
patent: 3940564 (1976-02-01), Orbach
patent: 3959594 (1976-05-01), Srivastava
patent: 3963870 (1976-06-01), Couder et al.
patent: 3980833 (1976-09-01), Calcagno et al.

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