Tamper-resistant, expandable communications system
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United States of America Patent
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-
May 22, 1984
Grant Date -
N/A
app pub date -
Aug 25, 1981
filing date -
Aug 25, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An expandable, multipurpose digital and analog communications system in which a plurality of remote interrogator units connected in a branch of the system are isolated from one another by band stop filters to permit simultaneous polling without interference with other operations. Also disclosed is a premium service control unit which makes uses of a frequency agile oscillator.
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