ADSL采用（上题）技术把PSTN线路划分为话音，上行下行三个独立的信道，同时提供电话和上网服务。采用ADSL联网，计算机需要通过（本题）和分离器链接到电话入户接线盒。
- A.ADSL交换机
- B.Cable Modem
- C.ADSL Modem
- D.无线路由器
正确答案及解析
正确答案
解析
ADSL是利用频分复用技术将电话线分成了三个独立的信道，分别是：电话、上行、下行。 用户需要使用一个ADSL终端（因为和传统的调制解调器（Modem）类似，所以也被称为“猫”）来连接电话线路。由于ADSL使用高频信号，所以在两端还都要使用ADSL信号分离器将ADSL数据信号和普通音频电话信号分离出来，避免打电话的时候出现噪音干扰。
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