H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/3, 379/33, 3
H04M 3/42 (2006.01) H04M 3/436 (2006.01) H04M 3/537 (2006.01)
Patent
CA 1093230
MESSAGE-WAITING AND DO-NOT-DISTURB COMMUNICATIONS SYSTEM Abstract of the Disclosure 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 exclu- sively 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 in- dicators are connected electrically with corresponding re- mote station indicators by individual signalling paths each consisting of a pair of electrical conductors along which bi- directional current flow respectively constitutes the mes- sage-waiting (or message-received) and do-not-disturb signals.
294926
Edwards Gerald L.
Ullakko Richard J.
Frayne & Company Robert
Tone Commander Systems Inc.
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