Method and device for checking a subscriber line
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United States of America Patent
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Aug 13, 2013
Grant Date -
Aug 13, 2009
app pub date -
Oct 14, 2006
filing date -
Oct 20, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
In a method for checking a subscriber line with a first and a second electrical line, wherein each line is connected to an encoder/decoder via a subscriber line circuit, the first line is connected to ground, a resistance of the second line is increased, an audio signal is outputted from the encoder/decoder to the first line; and a first frequency-selective signal is measured at a point at which the encoder/decoder is connected to the first line. Further, the second line is connected to ground, a resistance of the first line is increased, a further audio signal is output from the encoder/decoder to the second line, and a second frequency-selective signal is measured at a point at which the encoder/decoder is connected to the second line. An amplitude difference between the first and second frequency-selective signals is ascertained.
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