Patent ID: 7486723

Claim:
An asymmetrical digital subscriber line system comprising: an asymmetrical digital subscriber line transceiver operable to transmit and receive over a frequency spectrum, the frequency spectrum having a data transmission band from frequency F U0 to frequency F DE , the data transmission band including a first section from frequency F U0 to frequency F UE for transmitting upstream data and a second section from frequency F DO to frequency F DE for transmitting downstream data, the first section having a first subsection from frequency F U0 to frequency F U1 and comprising a channels and a second subsection from frequency F U1 to frequency F UE , wherein F U0 <F U1 <F UE ≦F D0 <F DE ; the data transmission in the first subsection has a first power spectral density, the data transmission in the second subsection has a second power spectral density lower than the first power spectral density, and the data transmission in the second section has a third power spectral density lower than the second power spectral density.