Title:
SUBSCRIBER'S LINE INTERFACE CIRCUIT
Document Type and Number:
Japanese Patent JPS56164660
Kind Code:
A
Abstract:
In this subscriber line interface circuit which comprises a pair of amplifiers whose outputs are connected to the subscriber's line, the input terminals of these amplifiers receive by means of negative feedback voltages having opposite phases depending on the transversal current I produced by the line interface circuit and independent of the longitudinal currents I accidentally produced on the subscriber's line. The two load impedances, which are connected between the supply terminals of the amplifiers and the terminals of a d.c. voltage supply source are controlled by means of their control terminals by voltages which have the same characteristics as the voltages applied to the input terminals of the amplifiers but which in addition have been shifted with a certain shift voltage Vz. Consequently, the amplifiers of the line interface circuit operate completely independent of the longitudinal currents.
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Inventors:
JIRUBERU MARII MARUSERU FUERIY
ETEIENNU JIYURE REIMONDO OZUMO
ETEIENNU JIYURE REIMONDO OZUMO
Application Number:
JP5727681A
Publication Date:
December 17, 1981
Filing Date:
April 17, 1981
Export Citation:
Assignee:
TRT TELECOM RADIO ELECTR
International Classes:
H04M19/00; (IPC1-7): H04M19/00