DSL（DIGITAL SUBSCRIBER LINE）是指（）。
ADSL概述（）ADSL是英文“Asymmetrical Digital Subscriber Line”的缩写，中文翻译为：（），它是数字用户线（DSL）技术的一种，可在普通铜线电话用户线上传送（）业务的同时，向用户提供1.5~8Mb/s速率的数字业务，在上行、下行方向的传输速率（）。
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xDSL系统主要由局端设备（DSLAM--Digital Subscriber LineAccess Multiplexer）和用户端设备（CPE）组成，局端由（）等组成。A、DSLAM接入平台B、DSL局端卡C、语音分离器D、IPC（数据汇聚设备）
A global manufacturer of automobile parts wants to implement specialized voice applications to increase productivity and reduce the cost of overseas toll calls. Which Cisco solution best matches this business need?（）A、Digital subscriber line (DSL)B、Optical networkC、Wireless local-area network (WLAN)D、Internet Protocol (IP) telephony
ADSL技术，即Asymmetric Digital Subscriber Line，中文名称为（），ADSL为充分利用频谱，ADSL一般采用（）调制技术。，提供宽带接入，上行速率可达到1Mbit/s，下行速率可达到（）bit/s。
Asymmetric Digital Subscriber Line简称（），能提供上下行不对称速率即非对称宽带业务。A、HDSLB、IDSLC、ADSLD、SDSL
A global manufacturer of automobile parts wants to implement specialized voice applications to increase productivity and reduce the cost of overseas toll calls. Which Cisco solution best matches this business need?（）A、Optical networkB、Digital subscriber line (DSL)C、Internet Protocol (IP) telephonyD、Wireless local-area network (WLAN)
What will significantly degrade DSL performance， regardless of DSL rate or line length？ （）A、Microliters installed between a telephone and shared lineB、POTS splitters at the subscriber’s end of the DSL lineC、POTS splitters at the telco COD、None of the other alternatives apply
