Subscriber line circuit comprising a controllable DC/DC converte

Details Subscriber line circuit comprising a controllable DC/DC converte Subscriber line circuit comprising a controllable DC/DC converte

1982-09-16

1984-12-25

Rubinson, Gene Z.

179 16F, H04B 336

Patent

active

044905807

ABSTRACT:
A subscriber line circuit comprises a controllable DC to DC converter (41) for producing a converter output signal which becomes a loop signal comprising a DC signal and/or a communication signal of a communication frequency band. First and second voltage signals are dependent (51, 69) on the current and the voltage of the loop signal, respectively. One of the voltage signals is amplified (71) with different transfer functions at DC and in the communication frequency band. The converter is controlled (85-86) by an error between a first sum (81) of the amplified signal and the other voltage signal and a second sum (82) of a reference voltage (E.sub.O) and a signal supplied from an output (27) of an exchange. A subtractor (92) supplies a difference between the exchange output signal and the second voltage signal to an input (25) of the exchange. Preferably, terminals (16, 17) for connection to a subscriber substation are isolated at DC from terminals (18, 19) for connection to the exchange input and output.

REFERENCES:
patent: 4254305 (1981-03-01), Treiber

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