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Therefore, the networking media for the horizontal cabling will be CAT 5 UTP. Now the types of networking media for the backbone cabling must be determined. After a preliminary study, the choices have been narrowed to two types, CAT 5 UTP and 62.5/125 碌 fiber-optic cable. Because of the high cost of installation, you would like to avoid using fiber-optic cable unless absolutely necessary. However, based on the preliminary study and projections, it has been determined that it may not be necessary to use fiber-optic cable because UTP could sufficiently carry all anticipated network data for the next ten years. There are, however, two more factors that could influence the decision. These factors include safety and distance. In light of this, consider the following points:</p><ol><li>The building has three different earth grounds. Could this present any safety problems for company A's network?</li><li>The maximum distance specified by TIA/EIA-568-A for CAT 5 cable is 100 m. Because the height of each floor is 4.9 m, if CAT 5 is used for the backbone cabling it will exceed this distance. Is there another way to solve the problem of distance between the POP and the MDF?</li><li>What will solve the problem of distance between the MDF and the IDFs?</li></ol><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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