Reversal of connections of telegraphic line wires upon detection

Details Reversal of connections of telegraphic line wires upon detection Reversal of connections of telegraphic line wires upon detection

1982-01-27

1984-02-28

Schreyer, Stafford D.

Telegraphy

Systems

Line-clearing and circuit maintenance

178 16, 178 69G, 178 63F, H04L 2502

Patent

active

044343248

ABSTRACT:
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.

REFERENCES:
patent: 3458727 (1969-07-01), Watkins

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