But with vdsl technology , telecom operators only need to extend the optical fibre to the buildings in many situations , this infrastructure is already available . and then install a vdsl transceiver at the subscriber s premises to transform the existing telephone twisted pair access network into an information superhighway with speeds increased multi - folded up to 56mbit s , hence fully utilize the bandwidth of the copper telephone lines 利用vdsl技术，电讯供应商只需将光纤引到小区或大楼，并在用户端加装一个接收器，即可用尽铜线的频段，把数据传输速度大幅增大一千倍至最高的56mb s ，真正实现对称及不对称的宽频传送。
System scheme of speech coding plus spread spectrum communication was presented based on a full analysis of noise characteristic , attenuation characteristic and impedance characteristic of low - voltage power line . spread spectrum carrier ( abbreviated as ssc ) technology is adopted to overcome problems existing in signal transmission over power line . high quality , low rate mbe compression algorithm was used to complete speech encoding and decoding 在对低压电力线路的噪声特性、衰减特性和阻抗特性三个方面充分分析的基础上，本文提出一种语音编码+扩频传输的系统总体方案，采用扩频载波( spreadspectrumcarrier ，缩写为ssc )技术克服电力线传输信号存在的问题，采用语音合成质量高并具有较低码率的mbe压缩算法完成语音信号的编解码。
Using vdsl solution , telecom operators will be able to offer existing and emerging services at unequaled speeds over the existing twisted pairs , supporting both symmetrical and asymmetrical services , including fast broadband internet accesses , vod ( video on demand ) , hdtv ( high definition television ) broadcasting and high quality real time videoconferencing . with the vdsl technology , subscribers can now use their telephone lines for voice communications while enjoying other broadband services at the same time 电讯供应商利用vdsl宽频传送方案，可为固网电话用户提供宽频互联网、视讯频道点播（ vod ） 、高解像电视（ hdtv ）广播及即时视像会议等先进电讯服务。由于数据传送不占用电话通讯的频段，用户使用各种宽频服务时仍可如常使用电话网络。
