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AssigneeIng. C. Olivetti & C., S.p.A.
InventorsGiuseppe Boggio, Mario Lorenzi
Estimating the term…
The system comprises at least one teleprinter station (1) connected to an exchange (3) by means of a transmission-reception line (2) and comprising a polarity detector (31) for the line circulating current, and a device (30) for reversing the connection of the line wires. If the wires erroneously become reversely connected following maintenance work on a line of single current type, then false call and conversation signals are generated which automatically trigger a checking operation in which the polarity detector is suitably examined under control of a ROM routine E controlling a CPU 84. If the current is found to be the reverse of the correct current, the reversing device is operated in order to reverse the polarity of the connection. In contrast, in the case of a double current line, the reversing device is operated when current is absent in the reception line, thus indicating an erroneous line connection. If the line current interruption is prolonged, a warning device (28) is activated.
A telegraphic communication system with automatic handling of irregularities in the connection of a transmission-reception line of a telegraphic station, the line normally carrying a predetermined current, comprising a polarity detector (31) in series with the line to detect the current polarity, and a device for reversing the connection of the line (30), characterised by checking means (84) operating in dependence upon the detector (31), for carrying out a check on the polarity of the current in order to cause the reversing device (30) to operate if the result of this check is negative.
Dependencies are inferred from the claim text.