(If the power signal light is not on, you should concentrate on troubleshooting the power supply. If it is not due to the instability of the mains power supply, the line is dropped, and whether there is a problem with the power supply of the ADSLModem itself. Assuming that the power signal light is always on, it means that the disconnection defect has nothing to do with the power supply, and you have to continue to investigate.)
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