H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/63
H04M 19/08 (2006.01) H04M 19/00 (2006.01) H04Q 3/00 (2006.01)
Patent
CA 1186083
Abstract of the Disclosure A subscriber line circuit comprises a controllable DC to DC converter for producing a converter output signal which becomes a loop signal comprising a DC signal and/or a communication signal of a communication fre- quency band. First and second voltage signals are dependent on the current and the voltage of the loop signal, respectively. One of the voltage signals is amplified with different transfer functions at DC and in the communication frequency band. The converter is controlled by an error between a first sum of the amplified signal and the other voltage signal and a second sum of a reference voltage and a signal supplied from an output of an exchange. A sub- tractor supplies a difference between the exchange output signal and the second voltage signal to an input of the exchange. Preferably, terminals for connection to a subscriber substation are isolated at DC from terminals for connection to the exchange input and output. The invention enables subscriber line circuits which are compact, light weight and low power consumers to be realized.
412273
Nippon Electric Co. Ltd.
Smart & Biggar
LandOfFree
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