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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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If possible, take the students on a tour of such locations within your school. The topology is an extended star. Note the distinction between horizontal and vertical cabling, which are governed by different standards and often may be different media.</p> </span></td> </tr> </table> </td> </tr> </table> </td> </tr> </table><p>The main hub of an extended star topology Ethernet LAN is usually centrally located. This central location is so important that in a high rise building, the MDF is usually located on one of the middle floors of the building, even though the POP might be located on the first floor, or in the basement.</p><p>The main graphic illustrates where the backbone cabling and horizontal cabling would be used in an Ethernet LAN, in a multi-story building. In the figure to the left, the backbone cabling (red lines) connects the POP to the MDF. Backbone cabling is also used to connect the MDF to the IDFs located on each floor. Horizontal cabling runs (blue lines) radiate out from the IDFs on each floor to the various work areas. Wherever the MDF is the only wiring closet on the floor, horizontal cabling radiate from it to the PCs on that floor.</p><p> <a href="#" onClick="window.open('../../../../../static/cabling/index.html','CablingStandards','width=742,height=390,toolbar=0,scrollbars=0,left=26,top=38');void(null);">Upcoming Changes in Cabling Standards</a> </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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