Key telephone system paging lockout circuit

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

H - Electricity

04

Q

344/19, 379/33

H04Q 5/18 (2006.01) H04M 11/02 (2006.01)

Patent

CA 1106988

B. R. SAXON - 7 A KEY TELEPHONE SYSTEM PAGING LOCKOUT CIRCUIT Abstract of the Disclosure The telephone system includes N line circuits, where N is equal to an integer greater than one. Each of the line circuits includes a first relay controlled circuit to lockout (N-1) of the line circuits from a paging amplifier if any of the (N-1) of the line circuits attempts to initiate a paging operation a fraction of a second after one of the N line circuits 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 line circuits attempting to initiate a paging operation after the one of the N line circuits has initiated a paging operation.

318042

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