| 摘要 |
<p>Remote terminal (RT) based ADSL is made compatible with central office (CO) based ADSL so as to maximize both the upstream and downstream data transmission rates while maintaining compliance with spectrum management guidelines. Flat power back-off (PBO) of the downstream transmit power for RT-based ADSL is combined with a notched frequency spectrum, i.e., the turning off some of the tones transmitted from RT-based ADSL. In additional a sloped power back-off (PBO) can be used alone or in combination with a notched frequency spectrum to improve data rates even more. These techniques can be used to make RT-based ADSL compatible with CO-based ADSL, at all combination of loop lengths, while still allowing the RT-based ADSL a downstream bit rate that is within the spectrum compatibility guidelines.</p> |
