Patent
1977-01-14
1978-04-25
Claffy, Kathleen H.
H04M 342
Patent
active
040864413
ABSTRACT:
The system includes a central station console and one or more remote station modules. Corresponding message-waiting indicators mounted by the central station console and each remote station module are accessed and controlled from the central station on a selective individual basis; but can be controlled alternatively from the remote station modules in order to indicate message-received. Corresponding do-not-disturb indicators mounted by the central station console and each remote station module are controlled exclusively from the latter. For telephone application, the do-not-disturb indicators additionally may be operated in a flashing mode when the associated telephone set assumes off-hook condition in order to provide call status indication. The central station message-waiting and do-not-disturb indicators are connected electrically with corresponding remote station indicators by individual signalling paths, each consisting of a pair of electrical conductors along which bidirectional current flow respectively constitutes the message-waiting (or message-received) and do-not-disturb signals.
REFERENCES:
patent: 3050592 (1962-08-01), Burgener
patent: 3320368 (1967-05-01), Applebaum
patent: 3826876 (1974-07-01), Gueldenpfenning
patent: 3928732 (1975-12-01), Simon
Edwards Gerald L.
Ullakko Richard J.
Claffy Kathleen H.
Popek Joseph A.
Tone Commander Systems, Inc.
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