Communications: electrical – Continuously variable indicating – With meter reading
Patent
1983-12-06
1986-12-09
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
455 9, 455 4, 375 10, 371 55, 34082516, H04Q 900, H04B 1702, G06F 1100
Patent
active
046283099
ABSTRACT:
A remote surveillance utilizing signalling incorporated in traffic and concerns more particularly digital links using a prohibited configuration code for the line signal. The purpose is to produce a system consisting of periodically incorporating an interrogation identifier containing a prohibited configuration in the line signal at the transmitter terminal, recognizing the interrogation identifiers as they pass through equipment under remote surveillance, modifying one interrogation identifier out of r by equipment that has remote surveillance data to be transmitted, using the interrogation identifiers reaching the receiving terminal intact to determine those time slots occupied by the remote surveillance signal and extracting the identifiers occupying these time slots for decoding the remote surveillance.
REFERENCES:
patent: 3987395 (1976-10-01), Desombre
patent: 4161634 (1979-07-01), Bellisio
patent: 4301538 (1981-11-01), Desombre et al.
patent: 4369523 (1983-01-01), Seki et al.
patent: 4473901 (1984-09-01), Jensen
Compagnie Industrielle des Telecommunications Cit-Alcatel
Yusko Donald J.
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