以下关于ADSL的叙述中，错误的是（ ）。
- A.采用DMT技术依据不同的信噪比为子信道分配不同的数据速率
- B.采用回声抵消技术允许上下行信道同时双向传输
- C.通过授权时隙获取信道的使用
- D.通过不同宽带提供上下行不对称的数据速率
正确答案及解析
正确答案
解析
在双绞线上，ADSL系统的上、下行数据和普通电话业务信号，采用频分复用（FDM）方式分享传输线路。通过FDM方法把整个带宽分为三个部分：语音，上行、下行。
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