Telephonic communications – Substation or terminal circuitry – Conversion of signal form
Patent
1994-03-11
1995-11-07
Hofsass, Jeffery A.
Telephonic communications
Substation or terminal circuitry
Conversion of signal form
379377, 379354, 379355, 379382, 379184, 379 40, 379 45, H04M 1100
Patent
active
054652979
ABSTRACT:
The present invention is directed to a telephone line seizure circuit which may find particular application in home security systems which feature an automatic dialer which automatically sends an alarm detection signal out on a telephone line when an alarm condition is detected. The telephone line seizure unit of the present invention operates so that when the automatic alarm dialer is on-hook, the telephone line seizure units are transparent to the telephone system and the telephones can then be used normally. When the automatic alarm dialer goes off-hook, then the telephone line seizure unit operates to disconnect any telephone in use connected thereto, which will thereby allow the automatic alarm dialer to go back on-hook briefly, and after about 30 or so to go off-hook, to thereby utilize the telephone line to send out the alarm detection signal.
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Design Tech International Inc.
Hofsass Jeffery A.
Saint-Surin Jacques M.
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