Tamper-resistant, expandable communications system

Details Tamper-resistant, expandable communications system Tamper-resistant, expandable communications system

H - Electricity

04

N

350/20

H04N 7/16 (2006.01) H04N 7/10 (2006.01)

Patent

CA 1253957

ABSTRACT An expandable, multipurpose digital and analog communication systems in which a plurality of remote interrogator units connected in a branch of the system are isolated from one another by bandstop filters to permit simultaneous polling without interfering with other operations. Also disclosed is a premium service control unit which makes use of a frequency-agile oscillator.

454707

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