KEY TELEPHONE SYSTEM PAGING LOCKOUT CIRCUIT

摘要

B. R. SAXON - 7 A KEY TELEPHONE SYSTEM PAGING LOCKOUT CIRCUIT 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.