Dial pulse key telephone intercom system

Details Dial pulse key telephone intercom system Dial pulse key telephone intercom system

1976-11-04

1978-04-25

Claffy, Kathleen H.

179 18AD, H04M 172

Patent

active

040864448

ABSTRACT:
The system receives subscriber station address information in the form of dial pulses transmitted from a calling station along a common intercom circuit and selectively accesses a called subscriber station having a corresponding station address in order to produce a call indication ring-out thereat. The system includes a hook condition detector circuit which controls multiple system functions with respect to the on-hook and off-hook status of the calling station, and further includes a dial pulse detector circuit which effects additional control with respect to completion of dialing by the calling station. The system is suitable for use with ten or varying numbers of subscriber stations and may include, for applications having more than ten subscriber stations, appropriate transfer and associated output control circuitry for double digit operation.

REFERENCES:
patent: 3014097 (1961-12-01), Apt
patent: 3668331 (1972-06-01), Warner
patent: 3670110 (1972-06-01), Warner
patent: 3725594 (1973-04-01), Cartwright
patent: 3739100 (1973-06-01), Cartwright
patent: 3909551 (1975-09-01), Marshall
patent: 3941944 (1976-03-01), McIntosh
patent: 4009354 (1977-02-01), Champan

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