Telephonic communications – Telephone line or system combined with diverse electrical... – Remote indication over telephone line
Patent
1987-09-16
1989-09-05
Ng, Jin F.
Telephonic communications
Telephone line or system combined with diverse electrical...
Remote indication over telephone line
379 92, 379 97, H04M 1100
Patent
active
048646032
ABSTRACT:
A method of transmission of information or measuring data and devices for using the method, wherein information or measuring data is transmitted from a local measuring device, located at a remote site, to a central interrogation station located at a central site where the data is processed, using a common carrier network while permitting the normal use of the telephone line. The data is transmitted from the local station to the central interrogation station by sending of a first call from the central station to the local station over the telephone line, the ringer of the called set being temporarily rendered inoperative, repetition, after a certain period has passed, of the call by central station, tying up of the line by the local station, and execution of the transmission procedure.
REFERENCES:
patent: 4126762 (1978-11-01), Martin et al.
patent: 4504831 (1985-03-01), Jahr et al.
patent: 4578700 (1986-03-01), Roberts et al.
patent: 4623758 (1986-11-01), Batla et al.
patent: 4716582 (1987-12-01), Blanchard et al.
Battmann Jean-Claude
Brochard Gerard
Charamnac Jean-Marie
Finas Roland
Pietri Vincent
Chan Wing F.
ELF France
Ng Jin F.
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