2. 计算机
  3. A　typical　application　of　this(71)is　ADSL.　It　is　emerging　as　the　technology　for　home-and　small-office　Internet　connectivity.　It　p

A　typical　application　of　this(71)is　ADSL.　It　is　emerging　as　the　technology　for　home-and　small-office　Internet　connectivity.　It　p

admin2009-02-15  39
问题 A　typical　application　of　this(71)is　ADSL.　It　is　emerging　as　the　technology　for　home-and　small-office　Internet　connectivity.　It　provides　either　1.5　Mb/s～8　Mb/s　from　the　network　to　the　user　and　64　Kb/s～512　Kb/s　in　the　reverse　direction　depending　on　the　distance,　12　000　or　18　000　feet..　The　different　speed　for　each　direction　gives　it　the(72)label.　ADSL　is　designed　to　take　advantage　of　the　fact　that　video-on　demand,　telecommuting,　and　Internet　access　traffic　are　inherently　asymmetrical.　The　user(73)a　brief　message　up　to　the　network　and　receives　a　ton　of　data　coming　back,　either　a　movie　or　a　piece　of　data　download.　Under　such　a　scenario,　low-speed　traffic　to　the　network　is　just　fine.　ADSL　delivers　high(74)where　you　need　it　and　only　uses　a　single　copper　pair.　Through　multiplexing,　it　also　reserves(75)of　the　bandwidth　for　POTS.
选项 A、FTTH
B、HFC
C、FTTC
D、HDSL
答案C
解析
转载请注明原文地址:https://kaotiyun.com/show/x5tZ777K
本试题收录于： 网络管理员上午基础知识考试题库软考初级分类
0

网络管理员上午基础知识考试

软考初级

相关试题推荐
随机试题
最新回复(0)