H - Electricity – 04 – M
Patent
H - Electricity
04
M
H04M 1/24 (2006.01) H04B 3/46 (2006.01) H04M 1/68 (2006.01) H04M 1/738 (2006.01) H04M 1/82 (2006.01) H04M 3/24 (2006.01)
Patent
CA 2256805
A method and apparatus to detect off-hook and intrusion conditions on a telephone line. A voltage to frequency converter is used to convert the voltage measured between the TIP and RING terminals of a telephone line to a frequency. The voltage is continuously monitored, once during each sample period. The measured frequency is compared to predetermined threshold values to determine the state of the telephone line. The predetermined threshold values are updated in each sample period.
Hemminger Rodney C.
Kelsey Todd P.
Maxwell Albert H. Jr.
Murphy Michael A.
Schleifer Fred F.
Abb Power T. & D. Company Inc.
Elster Electricity L.l.c.
Gowling Lafleur Henderson Llp
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