DISPOSITIVO PER L ACQUISIZIONE DI CRITERI TELEFONICI DA ORGANI DI CENTRALI ELETTROMECCANICHE

The apparatus for the collection of telephone criteria from electromechanical exchange devices is connected to the wires on which criteria are present, through extracting means (DP) that are completely built up of electronic components and are apt to extract both positive and negative voltages from a same wire and to supply a local microprocessor (EL) with digitized samples represented by bit patterns independent of fluctuations in time of the exchange voltage used for criteria generation. A control logic (LC) coordinates the operations of the extracting means with those of microprocessor (EL).