Automatic power denial circuit for a subscriber line interface c

Details Automatic power denial circuit for a subscriber line interface c Automatic power denial circuit for a subscriber line interface c

1981-08-19

1983-08-09

Schreyer, Stafford D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

179 77, 307542, 361 58, H04M 1900

Patent

active

043980660

ABSTRACT:
A subscriber line interface circuit is disclosed for a 2-wire telecommunication subscriber line. The circuit includes a DC voltage source for supplying power to the subscriber line and an automatic power denial circuit for interrupting the power if an overload condition exists. The power denial circuit includes two resistors connected in series in one wire of the subscriber line and a transistor connected to respond to the voltage drop across these two resistors, thereby to sense an overload condition. A second transistor, controlled by the first transistor, is connected across one of the two resistors and is biased to be normally conducting when no overload condition exists. When excessive current flows through the two resistors, indicating an overload condition, the second transistor is cut off to deny power to the subscriber line.

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