Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent
1990-08-30
1993-08-03
Dwyer, James L.
Telephonic communications
Supervisory or control line signaling
Signal reception at substation
379373, 379413, H04M 100
Patent
active
052336492
ABSTRACT:
A multiple phone ring boost circuit rings multiple subscriber telephones synchronized with a ring signal sent from a telephone company central office is connected to multiple subscriber telephones. A local generator creates a local ring signal, and a local generator sensing circuit determines if the local generator is functioning properly. A ring sensing circuit senses if a ring signal is being received. A switch connects the line leads to the subscriber leads in a first position, and connects the local generator to the subscriber leads in a second position. A control circuit varies the switch between the second and first positions. When the ring sensing circuit detects an incoming ring signal and the local generator sensing circuit detects a properly functioning local generator, the switch is placed in its second position. When the ring signal pauses, the control circuit places the switch in the first position. When a receiver of a subscriber telephone set is lifted off its switch hook, an increased load is placed on the local generator causing the control circuit to switch back to the first position.
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Dwyer James L.
Shehata M.
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