随着DSL技术的发展，新一代的VDSL2技术由于具有高带宽、兼容ADSL2＋等特性，使得它成为众多宽带运营商关注的焦点。VDSL（甚高比特率数字用户环路）：VDSL和ADSL技术相似，采用频分复用方式，将POTS、ISDN以及VDSL的上、下行信号放在了不同的频段传输，但VDSL比ADSL的传输速率更高，是高速的ADSL。VDSL在一对普通电话双绞线上提供的典型速率为上行1．6—2．3Mbit／s，下行12．96—55．2Mbit／s（目前最高达到155Mbit／s），速率比ADSL高约10倍，但传输距离比ADSL也短得多，典型的传输距离为0．3～1．5km。本文结合VDSL、ADSL和ADSL2＋最新的国际标准，主要介绍DSLAM24口功能、测试过程和一些在使用产品过程中常见可能发生的问题。%As a result of the fast development of the DSL VDSL2 technology, it leads to new generation VDSL high bandwidth, compatible with ADSL2＋features;make it become the main need of many broadband carries. VDSL（very high bit rate digital subscriber loop）：VDSL and ADSL technologies are similar in using frequency division multiplexing method,they put the downstream and up stream of ISDN and the VDSL on different frequency signal transmission,down on,but VDSL has a higher transmission rate than ADSL,it can reach up to 1.6-2.3Mbit/s upstream and 12.96-55.2Mbit/s downstream, so the speed rate is 10 times higher than ADSL.but distance is more shorter than Adsl.the typical distance is 0.3-1.5km. This document explains the main functions of DSLAM 24 ports,testing process and some common problems that can happen during using this product.
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