Method and arrangement for supplying direct current to a telepho

Details Method and arrangement for supplying direct current to a telepho Method and arrangement for supplying direct current to a telepho

1993-10-28

1994-08-02

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379399, H04M 100

Patent

active

053352726

ABSTRACT:
The present invention relates to a method and an arrangement for supplying direct current to a telephone line. According to the invention, the current supply characteristic is programmable. The arrangement comprises a direct current supply circuit which detects the line voltage and supplies a line current in accordance with a preprogrammed current supply characteristic. The circuit includes a first more high-voltage part and a second more low-voltage part, in which programming of the current supply characteristic takes place. For the purpose of achieving programming, a first resistive component having a programmable resistance is arranged essentially parallel with a capacitor in the second part. The first resistive component determines the supply resistance of the circuit for low line currents. For the purpose of programming the characteristic, the circuit also includes a voltage limiting element having a programmable reference voltage connected in series with a second resistive component having a programmable resistance, which are arranged substantially in parallel with the capacitor. The reference voltage determines a limit line current at which current limitation occurs and the second resistive component determines, together with the first resistive component the supply resistance of the circuit at current limitation. Finally, the polarity of the idling voltage of the circuit is also programmable.

REFERENCES:
patent: 4476350 (1984-10-01), Aull et al.
patent: 4563547 (1986-01-01), Booth
patent: 4631359 (1986-12-01), Johansson et al.

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