Method of and a circuit for energizing a subscriber's circuit in a telephone system
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United States of America Patent
Stats
-
Jun 25, 1985
Grant Date -
N/A
app pub date -
Sep 27, 1982
filing date -
Sep 29, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of energizing a subscriber's circuit in a telephone system having two separate constant-current sources arranged symmetrically to the subscriber's station is disclosed. Current flowing through the two lines of the circuit is measured by a shunt, and differences between the line currents are compensated by a regulating device which applies such reference voltages to respective current sources as to supply a maximum permissible current in each line. If this maximum value is exceeded, then the regulating device automatically turns off, and a reduced reference voltage is applied to the current sources so as to return to the maximum permissible value of the curent.
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Family
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Cited Art Landscape
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