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<html> <head> <meta content="en-us" http-equiv="Content-Language"> <meta content="text/html; charset=UTF-8" http-equiv="Content-Type"> <link type="text/css" rel="stylesheet" href="../../../../../css/ccna.css"> <script src="../../../../../js/framesetHelper.js" language="JavaScript"></script><script language="JavaScript"> window.scrollTo(0,0); function newPage(pageID) { alert("COMMING SOON!!\nThis feature is currently in development."); } function launchMoreInfo(oid) { dash = oid.indexOf('-'); sub1 = oid.substring(0,dash); sub2 = oid.substring(dash+1); // this is an URL base on the // system that generated the static // download of the curriculum. httpref = "http://nomar.sdf.cisco.com/servlet/org.cli.delivery.rendering.servlet.MIServlet/Static=true,LMSID=DTUI,Engine=dynamic,Theme=cnamstheme,Style=ccna,Language=en,Version=2,RootID=knet-v214aCV47051/CHAPID=null/RLOID=null/RIOID=null/"; newref = httpref + sub1 +"/"+ sub2 +"/moreinfoframeset.html"; //alert("new newref :\n" + newref); window.open(newref,'MoreInfo','toolbar=no,status=yes,menubar=no,location=no,scrollbars=yes,height=442,width=756,left=20,top=20,resizable=yes') } function launchContentResource(contentID) { top.currentSupport = 0; 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Note the 3km distance of optical fiber. This allows it to be used, in an Ethernet extended star topology, in a area greater than many high school and junior college campuses. On the other extreme, note that the use of UTP as a backbone cable has severe length restrictions.</p> </span></td> </tr> </table> </td> </tr> </table> </td> </tr> </table><p>The maximum distances for cabling runs vary from one type of cable to another. For backbone cabling, the maximum distance for cabling runs can also be impacted by how the backbone cabling is to be used. To understand what this means, assume that a decision has been made to use single-mode fiber-optic cable for the backbone cabling. If the networking media is to be used to connect the HCC to the MCC as described above, then the maximum distance for the backbone cabling run would be 3,000 m.<img border="0" src="../../../../../CHAPID=knet-v214aCH47508/RLOID=knet-v214aRLO47688/RIOID=knet-v214aRIO121738/knet/v214adataimage1/1.gif" width="12" height="12"></p><p>If the backbone cabling is to be used to connect the HCC to an ICC, and the ICC to the MCC, then the maximum distance of 3,000 m must be split between the two sections of backbone cabling. When this occurs, the maximum distance for the backbone cabling run between the HCC and the ICC is 500 m. The maximum distance for the backbone cabling run between the ICC and the MCC is 2,500 m.<img border="0" src="../../../../../CHAPID=knet-v214aCH47508/RLOID=knet-v214aRLO47688/RIOID=knet-v214aRIO121738/knet/v214adataimage2/2.gif" width="12" height="12"></p><p>The Figure <img border="0" src="../../../../../CHAPID=knet-v214aCH47508/RLOID=knet-v214aRLO47688/RIOID=knet-v214aRIO121738/knet/v214adataimage3/3.gif" width="12" height="12"> lists TIA/EIA-568-A specifications for maximum distances for backbone cabling runs for each type of networking media.</p><table cellpadding="0" cellspacing="4" width="63%" border="0" xmlns:java="http://xml.apache.org/xslt/java"> <tr> <td valign="middle" width="8%"><img height="23" width="23" src="../../../../../images/ccna/common/icon2.gif"></td><td valign="middle" width="92%"><span class="cstitle">Web Links</span></td> </tr> <tr> <td valign="middle" width="8%"> </td><td valign="middle" width="92%"><span class="smtext"><a target="_blank" href="http://www.siemon.com/glossary/definitions.html">Cabling Glossary</a></span></td> </tr> </table></td> </tr> </table> </td> </tr></table> <p> </p> <table width="100%" cellspacing="0" cellpadding="2" border="0" valign="bottom"> <tr> <td></td> </tr> </table> </body></html>⌨️ 快捷键说明
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