Modular, expandable intercom system for a multiple-station telep

Details Modular, expandable intercom system for a multiple-station telep Modular, expandable intercom system for a multiple-station telep

1977-08-12

1979-01-16

Brown, Thomas W.

179 37, H04M 900

Patent

active

041350634

ABSTRACT:
An intercom system for a key telephone installation which can be expanded and contracted to service a diverse number of subscriber units. The intercom system is expandable on a modular basis of eight subscriber units. The preferred embodiment can service up to forty-eight subscriber units. The intercom hardware includes a single supervision module, at least one signalling module, and one or more station modules. The intercom system provides up to six independent communication links for a forty-eight unit system. The system also provides such features as dial tone, ring-back tone, busy signal, interrupted ringing, and independent ringing. These features are provided by a hardware organization that is both expandable and comparatively inexpensive.

REFERENCES:
patent: 3584151 (1971-06-01), Kielar
patent: 3691310 (1972-09-01), Fenton
patent: 3749848 (1973-07-01), Knollman et al.
patent: 3757056 (1973-09-01), Foulkes
patent: 3790718 (1974-02-01), Jenkins, Jr.
patent: 3826875 (1974-07-01), Puig
patent: 3872262 (1975-03-01), Kerman
patent: 3996424 (1976-12-01), Agricola
patent: 4009354 (1977-02-01), Champan

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