Telephonic communications – Telephone line or system combined with diverse electrical... – Remote indication over telephone line
Patent
1986-01-21
1987-09-01
George, Keith E.
Telephonic communications
Telephone line or system combined with diverse electrical...
Remote indication over telephone line
379 98, 379413, H04M 1100
Patent
active
046913440
ABSTRACT:
A data transmitter unit (22) for transmitting data over conventional telephone lines (26) from a remote location (24) to a central location (28). The data transmitter unit (22) derives its operational power supply from the telephone lines (26) to which it is interconnected, thereby doing away with the requirement for a separate power supply. The transmitter unit (22) includes ring detect circuitry (46) for detecting a ring signal on the telephone line (26). The ring detect circuitry (46) cooperates with the stand by power supply (38) charged by a charging circuit (36) to energize a logic module (44) and analog converter circuitry (40, 42) which is interconnected to sensors (30, 32). The logic module (44) controls operation of a tone generator (48) which transmits frequency signals representative of the input received from the sensors (30, 32) over the telephone lines (20, 26) to a central location (28).
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Freer et al, "Local Battery Charging Over Subscriber Lines", The Post Office Electrical Engineer's Journal (UK), vol. 66, Part 2, Jul. 1973, pp. 73-76.
Ardolf Duane R.
Brown Richard W.
Aquatrol Corporation
George Keith E.
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