Tamper-resistant, expandable communications system

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

1981-08-25

1984-05-22

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 84, 358 86, 358115, 358118, 455 4, 455 5, H04N 716, H04N 710

Patent

active

044504810

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.

REFERENCES:
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patent: 3786424 (1974-01-01), McVoy et al.
patent: 3806814 (1974-04-01), Forbes
patent: 3889050 (1975-06-01), Thompson
patent: 4025851 (1977-05-01), Haselwood et al.
patent: 4035838 (1977-07-01), Bassani et al.
patent: 4343042 (1982-08-01), Schrock et al.
patent: 4345273 (1982-08-01), Barabas et al.
patent: 4365267 (1982-12-01), Tsuda
patent: 4367557 (1983-01-01), Stern et al.

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