ADSL利用了普通电话线中未使用的高频频段，采用先进的调制技术，提供宽带接入。

ADSL USES the high frequency band which has not been used in the common telephone line and the advanced modulating technique to provide broadband access.

youdao

ADSL利用了普通电话线中未使用的高频频段，采用先进的调制技术，提供宽带接入。

ADSL USES the high frequency band which has not been used in the common telephone line and the advanced modulating technique to provide broadband access.

youdao