Patent ID: 7839920

Claim:
A method for adjusting an Asymmetric Digital Subscriber Line (ADSL) transmitting power level, comprising: acquiring a current noise margin, a first current ADSL downlink attenuation, and a first maximum attainable rate after training a modem according to a present line activation rate of an ADSL, a predetermined noise margin, and a predetermined value of the ADSL transmitting power level; calculating a current power reduction value according to the current noise margin and the predetermined noise margin; determining an adjusted ADSL transmitting power level for adjusting the ADSL transmitting power level according to the current power reduction value and the predetermined value of the ADSL transmitting power level; after performing another training according to the adjusted ADSL transmitting power level, acquiring a second current ADSL downlink attenuation and a second maximum attainable rate; and replacing the second current ADSL downlink attenuation with the first ADSL downlink attenuation, and replacing a second maximum attainable rate with the first maximum attainable rate.