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Title:
SPEECH PATH LINE
Document Type and Number:
Japanese Patent JPS5450204
Kind Code:
A
Abstract:

PURPOSE: To set arbitrarily an arrival level to a terminal by compensating the line loss from the exchange to the subscriber terminal without having influence on the level characteristic of a four-wire section by providing an asymmetrical gain equipment in a two-wire section of the carrier telephony line.

CONSTITUTION: The signal of subscriber terminal 31 is subjected to an attenuation of 4dB by line loss 41 and is subjected to a gain of 4dB by asymmetrical gain equipment 61 and is made equal to the signal level from terminal 31. Meanwhile, the signal from point P1 is subjected to a gain of 11dB in gain equipment 61 and is subjected to an attenuation of 4dB by line loss 41 and reaches terminal 31 at -1dB in case of point P1 of -8dB. The similar level compensation is also performed in respect to subscriber terminal 32


Inventors:
KAWAKAMI IZUMI
KOMAZAKI TOMOKAZU
SHINOZAKI TOSHIO
TERAMOTO MITSUO
IMAI YUKIO
Application Number:
JP11563977A
Publication Date:
April 20, 1979
Filing Date:
September 28, 1977
Export Citation:
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Assignee:
OKI ELECTRIC IND CO LTD
International Classes:
H04M7/16; (IPC1-7): H04M7/16



 
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