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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><HTML><HEAD> <META HTTP-EQUIV="CONTENT-TYPE" CONTENT="text/html; charset=gb2312"> <TITLE>ADSL 寬頻簡介</TITLE> <META NAME="GENERATOR" CONTENT="WPS Office Storm Beta 1.0 (Win32)"> <META NAME="AUTHOR" CONTENT="VBird"> <META NAME="CREATED" CONTENT="20051029;16193290"> <META NAME="CHANGED" CONTENT="20051029;16194612"> <!-- saved from url=(0022)http://internet.e-mail --></HEAD><BODY LANG="zh-CN" BACKGROUND="020adsl_files/VBirdLinux.jpg" DIR="LTR"><P ALIGN=CENTER STYLE="margin-bottom: 0cm"><FONT COLOR="#3333ff"><B><FONT SIZE=5><FONT FACE="標楷體">鸟哥的</FONT></FONT></B><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><B><FONT SIZE=5><FONT FACE="Times New Roman, Times">Linux </FONT></FONT></B></FONT></SPAN></FONT><FONT COLOR="#3333ff"><B><FONT SIZE=5><FONT FACE="標楷體">与</FONT></FONT></B><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><B><FONT SIZE=5><FONT FACE="Times New Roman, Times">ADSL </FONT></FONT></B></FONT></SPAN></FONT><FONT COLOR="#3333ff"><B><FONT SIZE=5><FONT FACE="標楷體">私房菜</FONT></FONT></B></FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><BR><A HREF="http://linux.vbird.org/" TARGET="_top"><IMG SRC="020adsl_files/VBirdTitle2.jpg" NAME="图形1" ALIGN=BOTTOM WIDTH=90 HEIGHT=25 BORDER=0></A><A HREF="http://linux.vbird.org/linux_basic"><IMG SRC="020adsl_files/icon_system.gif" NAME="图形2" ALIGN=BOTTOM WIDTH=90 HEIGHT=25 BORDER=0></A><A HREF="http://linux.vbird.org/linux_server"><IMG SRC="020adsl_files/icon_server.gif" NAME="图形3" ALIGN=BOTTOM WIDTH=90 HEIGHT=25 BORDER=0></A><A HREF="http://linux.vbird.org/linux_security"><IMG SRC="020adsl_files/icon_security.jpg" NAME="图形4" ALIGN=BOTTOM WIDTH=90 HEIGHT=25 BORDER=0></A><A HREF="http://phorum.vbird.org/" TARGET="_blank"><IMG SRC="020adsl_files/icon_forums.gif" NAME="图形5" ALIGN=BOTTOM WIDTH=90 HEIGHT=25 BORDER=0></A><A HREF="http://linux.vbird.org/adsl"><IMG SRC="020adsl_files/icon_adsl.gif" NAME="图形6" ALIGN=BOTTOM WIDTH=90 HEIGHT=25 BORDER=0></A></SPAN></FONT></P><HR><P STYLE="margin-bottom: 0cm"><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT COLOR="#3333ff"><FONT SIZE=5><FONT FACE="Times New Roman Baltic">ADSL</FONT></FONT></FONT></SPAN></FONT><FONT COLOR="#3333ff"><FONT SIZE=5><FONT FACE="標楷體">宽带简介</FONT></FONT></FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"></SPAN></FONT></P><P ALIGN=RIGHT STYLE="margin-bottom: 0cm"><FONT COLOR="#3333ff"><FONT SIZE=2><FONT FACE="新細明體">最近更新日期：</FONT></FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT SIZE=2><FONT FACE="新細明體">2002/01/20</FONT></FONT></SPAN></FONT></FONT></P><P STYLE="margin-bottom: 0cm"><A HREF="#doyouneed"><FONT COLOR="#000099"><FONT SIZE=4>传统拨接还是</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT SIZE=4>ADSL </FONT></FONT></A></SPAN></FONT><A HREF="#doyouneed"><FONT COLOR="#000099"><FONT SIZE=4>宽带</FONT></FONT></A><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><BR><A HREF="#adsl"><FONT COLOR="#000099"><FONT SIZE=4>ADSL </FONT></FONT></A></SPAN></FONT><A HREF="#adsl"><FONT COLOR="#000099"><FONT SIZE=4>的两三事</FONT></FONT></A><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><BR></SPAN></FONT><A HREF="#time"><FONT SIZE=4><FONT COLOR="#000099">计时制还是固定制</FONT></FONT></A><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"></SPAN></FONT></P><HR><P><A NAME="doyouneed"></A><FONT COLOR="#000099"><FONT SIZE=4>传统拨接还是</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT SIZE=4>ADSL </FONT></FONT></SPAN></FONT><FONT COLOR="#000099"><FONT SIZE=4>宽带？</FONT></FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"></SPAN></FONT></P><BLOCKQUOTE><FONT COLOR="#000000"><FONT FACE="新細明體">当前台湾地区的网络挂机方式中，除了学术网络可直接连上因特网之外，一般的用户或企业用户则必须通过电话拨接，或者是近来流行的宽带系统（或者说成是拉专线）进行挂机。由于传统的电话拨接系统之传输速率实在太慢了（最高到</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">56 Kbps </FONT></SPAN></FONT><FONT FACE="新細明體">），所以才会有</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">ADSL </FONT></SPAN></FONT><FONT FACE="新細明體">或者是</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">Cable Modem </FONT></SPAN></FONT><FONT FACE="新細明體">等宽带系统的生成。简单的讲，所谓的『宽带』其实是利用较新的技朮，以让用户在拨接时获得比较高流量的数据传输。</FONT></FONT></BLOCKQUOTE><BLOCKQUOTE><FONT COLOR="#000000"><FONT FACE="新細明體">那连上因特网之好处为何？为何大家一窝蜂</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體"></FONT></SPAN></FONT><FONT FACE="新細明體">的想连上因特网呢？由于因特网上的丰富信息，你可以想象不用出门便知天下事的情况，例如，研究生查询</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">paper</FONT></SPAN></FONT><FONT FACE="新細明體">数据再也不用直接跑到图书馆去，也可以</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體"></FONT></SPAN></FONT><FONT FACE="新細明體">使用关键字查询的方法来寻找个人适合的信息。因此，因特网可以预见的，会越来越热门，尤其是下一波传统商业行为配合因特网销售行为的消费型态！更有甚</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體"></FONT></SPAN></FONT><FONT FACE="新細明體">者，如果你想要自己架设一些站点的话（例如</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">WWW</FONT></SPAN></FONT><FONT FACE="新細明體">站、</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">FTP</FONT></SPAN></FONT><FONT FACE="新細明體">站、</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">mail-server</FONT></SPAN></FONT><FONT FACE="新細明體">站等等），那就一定要连上因特网啦！</FONT></FONT></BLOCKQUOTE><BLOCKQUOTE><FONT SIZE=4><FONT FACE="標楷體"><FONT COLOR="#000099">传输速率的问题：</FONT></FONT></FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><BR></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">这里就生成了一个问题，你连上网络后，实际的数据传输行为或许你可以不理（就是一些</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">IP</FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">协议等等的），但是实际有关的下装速度你可能就不会不</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">care </FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">了吧！传统的电话拨接网络，最高仅可至</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">56Kbps</FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">（这个</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">Kbps </FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">是</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">Kbit/second </FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">，当实际转换成</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">KBytes </FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">时，只有每秒 </FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">7KBytes </FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">的传输量！）如果你要下装的数据超过</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">10MBytes </FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">时（例如某些驱动程序，即使压缩档也会到</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">10MB</FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">以上！），换算一下，你可能需要</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">25</FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">分钟</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體"></FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">以上的时间才能下装完毕！所以才会有越来越多的网络族群申请数据传输速度较快的</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">ADSL </FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">或</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">cable</FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">等宽带传输的服务！</FONT></FONT></BLOCKQUOTE><BLOCKQUOTE><FONT COLOR="#000000"><FONT FACE="新細明體">另外有一个最大的问题，当前在网络上所谓的传输速率均是使用</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">Kbps </FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">，亦即是</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體"></FONT></FONT><FONT FACE="新細明體"><FONT COLOR="#000066">Kbits/ second</FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">，与我们一般在</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">PC </FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">上头文件总管上看到的文件大小（</FONT></FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體"><FONT COLOR="#000066">KBytes</FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">）是不一样的，因为</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體"></FONT></FONT><FONT FACE="新細明體"><FONT COLOR="#3333ff">8bits=1byte</FONT><FONT COLOR="#000000"></FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">，所以你所看到的网络传输速率都要在除上</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">8 </FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">这个因子。举个例子，当前市面上看到的网络卡所标示的网络速率是</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">10/100Mbps</FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">，这个</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">bps </FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">就是</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">bits/second </FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">，因此，实际上的传输速率是</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">1.25/12.5 MBytes/second</FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">；而一些固网公司提交的计时制</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">ADSL </FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">之传输速率可到</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">512/64 Kbps </FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">也同样要在除上</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">8 </FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">，就变成了</FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT FACE="新細明體">64/8 KBytes/second </FONT></FONT></SPAN></FONT><FONT COLOR="#000000"><FONT FACE="新細明體">了！</FONT></FONT></BLOCKQUOTE><BLOCKQUOTE><FONT COLOR="#000099"><FONT SIZE=4><FONT FACE="標楷體">传统拨接还是</FONT></FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US"><FONT SIZE=4><FONT FACE="標楷體"></FONT><FONT FACE="Times New Roman Baltic">ADSL</FONT> </FONT></FONT></SPAN></FONT><FONT COLOR="#000099"><FONT SIZE=4><FONT FACE="標楷體">拨接系统？</FONT></FONT></FONT><FONT FACE="Tahoma, serif"><SPAN LANG="en-US">⌨️ 快捷键说明
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