Patent
1976-04-02
1977-08-30
Olms, Douglas W.
1791752R, H04M 326
Patent
active
040456226
ABSTRACT:
A method for avoiding interference with the "logic" section of an electronic central control unit by the voltages manipulated in a network of peripheral elements, for instance in a telephone switching system, is provided. The method according to the invention uses generators which transmit recurring test pulses along two-wire lines coupled by transformers with amplifiers delivering pulses, staggered in amplitude and time, into a network of peripheral elements. Depending upon the state of these elements pulses are retransmitted, or are not retransmitted, to the base of a bipolar transistor which opens or closes a two-wire line coupled by a transformer to a receiver of the central control unit.
REFERENCES:
patent: 3206729 (1965-09-01), Longcroft
patent: 3604860 (1971-09-01), Buchheit
patent: 3659044 (1972-04-01), Olson
patent: 3713103 (1973-01-01), Risky
patent: 3713104 (1973-01-01), Stich
Favre Rene Marc
Gravez Pierre
Le Cardonnel Gerard
"Thomson-CSF"
Olms Douglas W.
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