Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent
1995-12-19
1997-02-18
Brown, Thomas W.
Telephonic communications
Supervisory or control line signaling
Signal reception at substation
379199, 379376, 379377, 379421, H04M 166
Patent
active
056047975
ABSTRACT:
A device for muting a ringer of a telephone, the device being placed in series with a telephone ringer and having a gate alterable between a non-conductive state and a conductive state whereby a ring signal is selectively passed to the ringer. A remote calling party may activate the conductive state by sending a first and last ring signal separated by a preselected time interval, dependent upon the selected mode of the device. The device includes a gate controlled by output signals from a pair of interactive timing mechanisms, referred to as a delay timer and a window timer. In a first ring mode, the delay timer is activated by a remotely generated first ring signal and disregards all subsequent ring signals during completion of its timing sequence (the delay sequence). In a last ring mode, the delay timer is restarted upon receiving each ring signal, thus completing the delay sequence only after the last ring signal is received. When the power to the device is turned on, the device is initialized wherein the gate is placed into a non-conductive state preventing conduction of the ring signal to the ringer, thereby silencing the ringer. Thus, until the delay timer subsequently completes a time sequence (the delay sequence), the ringer remains disabled, the gate being in a non-conductive state. However, upon completion of the delay sequence, the delay time activates a window timer which places the gate into a conductive state (ring enabled).
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Brown Thomas W.
Litman Richard C.
Saint-Surin Jacques M.
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