Switching arrangement for monitoring polarity reversal on lines

Details Switching arrangement for monitoring polarity reversal on lines Switching arrangement for monitoring polarity reversal on lines

1977-03-30

1978-05-30

Robinson, Thomas A.

Telegraphy

Systems

Automatic

307236, 328118, H04L 1500, H03K 520

Patent

active

040924890

ABSTRACT:
Apparatus is described for monitoring the state, e.g., with regard to polarity, of signal lines in a telecommunication system. An input circuit, by means of high resistances relative to the line resistance, connects the lines to a differential amplifier having a predetermined threshold of response. A component of the amplifier output is applied to the input so as to have a polarity opposite to that of a bias voltage coupled to the amplifier. A capacitive protective circuit connected between the signal lines provides a time delay thereby protecting against interference pulses.

REFERENCES:
patent: 3509474 (1970-04-01), Arnold et al.
patent: 3697782 (1972-10-01), Matouka
patent: 3894288 (1975-07-01), Musser, Jr.
patent: 3916326 (1975-10-01), Woyton

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