C114门户论坛百科APPEN| 举报 切换到宽版

通信人家园

 找回密码
 注册

只需一步，快速开始

短信验证，便捷登录

搜索
返回列表 发新帖
查看: 4248|回复: 1
打印

问个基础的问题 [复制链接]

Male不在线
zlzhao2002

军衔等级：

  上等兵

注册：2006-9-20
跳转到指定楼层
1# 大 中 小
发表于 2008-5-26 21:05:00 |只看该作者 |倒序浏览
<p>请教一下~</p><p class="MsoNormal" style="MARGIN: 4pt 0cm 4pt 3cm;"><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">可将</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">C4</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">的基帧（</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">9</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">行×</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">260</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">列）划分为</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">9</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">个子帧，每个子帧占一行。每个子帧又可以</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">13</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">个字节为一个单位，分成</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">20</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">个单位（</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">20</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">个</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">13</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">字节块）。每个子帧的</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">20</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">个</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">13</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">字节块的第</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">1</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">个字节依次为：</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">W</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">X</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">Y</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">Y</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">Y</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">X</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">Y</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">Y</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">Y</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">X</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">Y</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">Y</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">Y</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">X</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">Y</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">Y</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">Y</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">X</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">Y</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">Z</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">，共</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">20</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">个字节，每个</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">13</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">字节块的第</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">2</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">到第</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">13</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">字节放的是</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">140Mbit/s</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">的信息比特。见图</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">2-5</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">：</span></p><p class="MsoNormal" align="right" style="MARGIN: 4pt 0cm; TEXT-ALIGN: right;"><span lang="EN-US"><shapetype id="_x0000_t75" stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" opreferrelative="t" ospt="75" coordsize="21600,21600"><stroke joinstyle="miter"></stroke><formulas><f eqn="if lineDrawn pixelLineWidth 0"></f><f eqn="sum @0 1 0"></f><f eqn="sum 0 0 @1"></f><f eqn="prod @2 1 2"></f><f eqn="prod @3 21600 pixelWidth"></f><f eqn="prod @3 21600 pixelHeight"></f><f eqn="sum @0 0 1"></f><f eqn="prod @6 1 2"></f><f eqn="prod @7 21600 pixelWidth"></f><f eqn="sum @8 21600 0"></f><f eqn="prod @7 21600 pixelHeight"></f><f eqn="sum @10 21600 0"></f></formulas><path oconnecttype="rect" gradientshapeok="t" oextrusionok="f"></path><lock aspectratio="t" vext="edit"></lock></shapetype><shape id="_x0000_i1025" type="#_x0000_t75" style="WIDTH: 414.75pt; HEIGHT: 289.5pt;"><imagedata cropright="55f" cropleft="1005f" cropbottom="-879f" croptop="929f" otitle="" src="file:///D:\目录\TEMP\msohtml1\01\clip_image001.wmz"></imagedata></shape></span></p><p class="FigureDescription" style="MARGIN: 4pt 0cm 16pt 3cm; TEXT-INDENT: -3cm; mso-text-indent-alt: 0cm;"><span lang="EN-US" style="mso-bidi-font-family: 黑体;"><span style="mso-list: Ignore;"><span style="FONT: 7pt &quot;Times New Roman&quot;;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><font size="2">图2-1 </font></span></span><font size="2"><span lang="EN-US">C-4</span><span style="FONT-FAMILY: 黑体; mso-ascii-font-family: 宋体; mso-bidi-font-family: 宋体;">的子帧结构</span></font></p><p class="MsoNormal" style="MARGIN: 4pt 0cm 4pt 3cm;"><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">E4</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">信号的速率适配就是通过</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">9</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">个子帧的共</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">180</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">个</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">13</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">字节块的首字节来实现。那么怎么实现的呢？一个子帧中每个</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">13</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">字节块的后</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">12</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">个字节均为</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">W</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">字节再加上第一个</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">13</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">字节的第一个字节也是</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">W</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">字节共</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">241</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">个</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">W</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">字节、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">5</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">个</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">X</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">字节、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">13</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">个</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">Y</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">字节、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">1</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">个</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">Z</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">字节。各字节的比特内容见图</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">2-5</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">。那么一个子帧的组成是：</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;"><p></p></span></p><p class="MsoNormal" style="MARGIN: 4pt 0cm 4pt 3cm;"><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">C4</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">子帧＝</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">241W</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">＋</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">13Y</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">＋</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">5X</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">＋</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">1Z</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">＝</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">260</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">个字节＝（</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">1934I</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">＋</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">S</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">）＋</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">5C</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">＋</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">130R</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">＋</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">10O</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">＝</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">2080bit<p></p></span></p><p class="MsoNormal" style="MARGIN: 4pt 0cm 4pt 3cm;"><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">一个</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">C4</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">子帧总计有</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">8</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">×</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">260</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">＝</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">2080bit</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">，其分配是：</span></p><p class="MsoNormal" style="MARGIN: 4pt 0cm 4pt 3cm;"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial;">信息比特</span><span lang="EN-US">I</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial;">：</span><span lang="EN-US">1934</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial;">；固定塞入比特</span><span lang="EN-US">R</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial;">：</span><span lang="EN-US">130</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial;">；开销比特</span><span lang="EN-US">O</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial;">：</span><span lang="EN-US">10</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial;">；调整控制比特</span><span lang="EN-US">C</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial;">：</span><span lang="EN-US">5</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial;">；调整机会比特</span><span lang="EN-US">S</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial;">：</span><span lang="EN-US">1</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial;">。</span></p><p class="MsoNormal" style="MARGIN: 4pt 0cm 4pt 3cm;"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial;"></span></p><p class="MsoNormal" style="MARGIN: 4pt 0cm 4pt 3cm;"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial;">请问怎么算出来<span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">241W</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">＋</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">13Y</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">＋</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">5X</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">＋</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">1Z</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">＝</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">260</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">个字节＝（</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">1934I</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">＋</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">S</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">）＋</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">5C</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">＋</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">130R</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">＋</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">10O</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">＝</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">2080bit</span></span></p><p class="MsoNormal" style="MARGIN: 4pt 0cm 4pt 3cm;"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial;"><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">为什么有<span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">241</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">个</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">W</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">字节、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">5</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">个</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">X</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">字节、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">13</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">个</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">Y</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">字节、</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">1</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">个</span><span lang="EN-US" style="BACKGROUND: yellow; mso-highlight: yellow;">Z</span><span style="BACKGROUND: yellow; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-highlight: yellow;">字节？</span><p></p></span></span></p>

举报本楼

本帖有 1 个回帖，您需要登录后才能浏览 登录 | 注册
返回列表 发新帖
高级模式
B Color Image Link Quote Code Smilies
您需要登录后才可以回帖 登录 | 注册 |

手机版|C114 ( 沪ICP备12002291号-1 )|联系我们 |网站地图  

GMT+8, 2024-11-24 19:20 , Processed in 0.573877 second(s), 15 queries , Gzip On.

Copyright © 1999-2023 C114 All Rights Reserved

Discuz Licensed

回顶部