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标题: 请教室内分布的问题! [查看完整版帖子] [打印本页]
时间: 2007-6-5 16:57
作者: dingpengtao
标题: 请教室内分布的问题!
网络覆盖的问题:隧道覆盖用的泄漏电缆损耗大概是100米多少?拓普结构是星型吗?
时间: 2007-6-11 17:08
作者: dingpengtao
<p>自己先顶下!</p>
时间: 2007-7-26 16:42
作者: weiboye
<p>隧道覆盖的泄漏电缆一般分为：耦合型电缆和放射型电缆，而且还有型号之分，如常用的电缆型号有：7/8、1/2两种，泄漏电缆的损耗又分为：耦合损耗和线路损耗。</p><p>一般认为：7/8电缆的线损为6dB/100m、1/2电缆的线损为11dB/100m，两种的耦合损耗一般要求在<65dB。</p><p>隧道覆盖电缆的拓扑结构一般为线型。</p>
时间: 2007-7-28 09:40
作者: tjtxkj001
<p>还要补充一点就是不同频率的损耗的是不一样的GSM/CDMA线路损耗7/8馈线3.9dB,1/2馈线为6.8dB，PHS&3G频率信号线路损耗7/8馈线为6.1dB，1/2馈线为10.7dB.
</p>
[此贴子已经被作者于2007-7-28 9:46:58编辑过]
时间: 2007-7-30 17:18
作者: lvchalong
学习了,谢谢
时间: 2007-11-21 10:20
作者: mixiaojing
不懂啊
时间: 2007-11-23 10:03
作者: super__m
结构是线型加中继
时间: 2007-11-23 14:35
作者: mixiaojing
学习
时间: 2007-11-23 16:19
作者: hbmasm
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LAYOUT-GRID-MODE: char; TEXT-INDENT: 24pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly; mso-layout-grid-align: none;"><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">泄漏电缆特性(GSM)：</span><span lang="EN-US" style="FONT-SIZE: 12pt;"><p><font face="Times New Roman"> </font></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LAYOUT-GRID-MODE: char; TEXT-INDENT: 24pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly; mso-layout-grid-align: none;"><span lang="EN-US" style="FONT-SIZE: 12pt;"><font face="Times New Roman">7/8</font></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">漏缆损耗</span><span lang="EN-US" style="FONT-SIZE: 12pt;"><font face="Times New Roman">4.5dB/100m</font></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">（</span><span lang="EN-US" style="FONT-SIZE: 12pt;"><font face="Times New Roman">7/8</font></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">漏缆损耗一般为</span><span lang="EN-US" style="FONT-SIZE: 12pt;"><font face="Times New Roman">4--5 dB/100m</font></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">），</span><span lang="EN-US" style="FONT-SIZE: 12pt;"><p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LAYOUT-GRID-MODE: char; TEXT-INDENT: 24pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly; mso-layout-grid-align: none;"><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">瑞利衰减损耗：β</span><span lang="EN-US" style="FONT-SIZE: 12pt;"><font face="Times New Roman">=11dB</font></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">，</span><span lang="EN-US" style="FONT-SIZE: 12pt;"><p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LAYOUT-GRID-MODE: char; TEXT-INDENT: 24pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly; mso-layout-grid-align: none; mso-outline-level: 1;"><span lang="EN-US" style="FONT-SIZE: 12pt;"><font face="Times New Roman">95%</font></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">接收概率耦合损耗为</span><span lang="EN-US" style="FONT-SIZE: 12pt;"><font face="Times New Roman">64</font></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">±</span><span lang="EN-US" style="FONT-SIZE: 12pt;"><font face="Times New Roman">5dB/2m</font></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">处，</span><span lang="EN-US" style="FONT-SIZE: 12pt;"><p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LAYOUT-GRID-MODE: char; TEXT-INDENT: 24pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly; mso-layout-grid-align: none;"><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">大于</span><span lang="EN-US" style="FONT-SIZE: 12pt;"><font face="Times New Roman">2m</font></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">时采用宽度因子α</span><span lang="EN-US" style="FONT-SIZE: 12pt;"><font face="Times New Roman">=20lg<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"> (D/2)</shapetype></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LAYOUT-GRID-MODE: char; TEXT-INDENT: 24pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly; mso-layout-grid-align: none;"><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">（其中</span><span lang="EN-US" style="FONT-SIZE: 12pt;"><font face="Times New Roman">D</font></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">为泄漏电缆离手机最远的距离，单位为米）</span><span lang="EN-US" style="FONT-SIZE: 12pt;"><p></p></span></p><p class="MsoNormalIndent" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%;"><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman';">设泄漏电缆末端场强为<span lang="EN-US">X</span>，假设距泄漏电缆最远端为<span lang="EN-US">4</span>米，则此处场强为：<span lang="EN-US"><p></p></span></span></p><p class="MsoNormalIndent" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%; mso-outline-level: 1;"><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman';"><span style="mso-spacerun: yes;"> </span>X -</span><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman';">（<span lang="EN-US">64+5</span>）<span lang="EN-US">-</span>α<span lang="EN-US">-</span>β<span lang="EN-US">= X -86dBm<p></p></span></span></p><p class="MsoNormalIndent" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%;"><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman';">若保证覆盖区域内边缘场强<span lang="EN-US">-80dBm<p></p></span></span></p><p class="MsoNormalIndent" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%;"><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">即：</span><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%;"><font face="Times New Roman">X-</font></span><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">（</span><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%;"><font face="Times New Roman">64+5</font></span><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">）</span><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%;"><font face="Times New Roman">-11-6</font></span><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">＞</span><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%;"><font face="Times New Roman">-80dBm<p></p></font></span></p><p class="MsoNormalIndent" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%;"><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">则</span><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%;"><font face="Times New Roman">:<span style="mso-spacerun: yes;"> </span>X</font></span><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">＞</span><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%;"><font face="Times New Roman">6dBm</font></span><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">，即能满足要求。</span></p><p class="MsoNormalIndent" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%;"><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';"></span></p><p class="MsoNormalIndent" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%;"><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';"></span></p><p class="MsoNormalIndent" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%;"><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">以前做隧道工程时总结的数据，提供给大家共同学习</span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';"></span><span lang="EN-US" style="FONT-SIZE: 12pt;"><p><font face="宋体"></font></p></span></p>
时间: 2007-12-18 16:51
作者: lvchalong
学习了,谢谢
时间: 2007-12-25 15:37
作者: liucmonkey
楼上滴很多是电缆的损耗吧，并不是漏缆的哦，漏缆滴实际应用中损耗要大
时间: 2008-3-31 11:03
作者: fengshiai
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