Key telephone system paging lockout circuit

Details Key telephone system paging lockout circuit Key telephone system paging lockout circuit

1977-12-22

1979-03-13

Claffy, Kathleen H.

179 17B, H04M 172, H04M 170

Patent

active

041444159

ABSTRACT:
The telephone system includes N line paging lockout printed circuit cards, where N is equal to an integer greater than one. Each of the paging lockout cards includes a first relay controlled circuit to lockout (N-1) of the paging lockout cards from a paging amplifier if any of the (N-1) of the paging lockout cards attempts to initiate a paging operation a fraction of a second after one of the N paging lockout cards has initiated a paging operation. A second relay controlled circuit applies a busy tone to a telephone subset associated with each of the (N-1) of the paging lockout cards attempting to initiate a paging operation after the one of the N paging lockout cards has initiated a paging operation.

REFERENCES:
patent: 3941943 (1976-03-01), Matheny
patent: 4013844 (1977-03-01), Saxon
patent: 4075434 (1978-02-01), Merritt, Jr.
patent: 4079212 (1978-03-01), Sasai

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