Method of and a circuit for energizing a subscriber's circuit in

Details Method of and a circuit for energizing a subscriber's circuit in Method of and a circuit for energizing a subscriber's circuit in

1982-09-27

1985-06-25

Rubinson, Gene Z.

179 81R, H04M 1900

Patent

active

045256020

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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