(The line elements that cause the defects of ADSL users can be mainly divided into two categories: the first category is attenuation line defects; the second category is annoying line defects. The main disadvantages of the attenuation line are: the user line is too long, the transmission performance of the line material is poor, the line is short-circuited and open, the connector is oxidized, the contact is poor, the bridge taps are too many, and there are induction coils on the line, etc.)
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