| 摘要 |
<p>A method for extending signal transmission distance in ADSL, by promoting the downlink power spectral density of ADSL signal in the office end or the uplink power spectral density of ADSL signal in the user end or both of them; a system for extending signal transmission distance in ADSL, comprises: adjustment unit of power spectral density and sending unit. It enlarges the coverage of the ADSL signals, and promotes the power spectral density of downlink ADSL signals only in the office end, without any update in user end, therefore reduces the cost. Further, it extends the signal transmission distance in ADSL, by promoting the power spectral density on transmission control signal.</p> |
