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<html> <head> <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"> var pageLoaded = false; var current = ''; var currentChapter = 'knet-v214aCH47505'; function launchReference(rioID, rloID, chapterID) { contentID = "knet-v214aCV47051"; dash = contentID.indexOf('-'); sub1 = contentID.substring(0,dash); sub2 = contentID.substring(dash+1); numbackParams = "CHAPID=" + chapterID + "/RLOID=" + rloID + "/RIOID=" + rioID; ContentRef = "../../../../../"+ numbackParams + "/"+ sub1 +"/"+ sub2 +"/"; eval('top.frames.main_frame.location.href="'+ContentRef+'referencecontroller_pf.html"'); } function PrevPage() { top.currentSupport--; if (top.currentSupport <= 0) { returnContent(); } else { if (top.firstSupportPage == top.contentResourceID) { returnContent(); } else if (top.prevPage == quizID) { launchQuiz(); } else { launchReview(); } } } function launchReview(reviewID) { top.currentSupport = 0; chapterID = "knet-v214aCH47505"; nbparams = "CHAPID="+chapterID+"/RLOID="+"knet-v214aRLO47654"+"/RIOID="+reviewID; dash = chapterID.indexOf('-'); sub1 = chapterID.substring(0,dash); sub2 = chapterID.substring(dash+1); ContentRef = "../../../../../"+ nbparams +"/"+ sub1 +"/"+ sub2 +"/"; //alert(ContentRef); eval('top.frames.main_frame.location.href="'+ContentRef+'pageframesetrio.html"'); //added for navigating between Quiz and Review and back to regular Chapter pages top.currentSupport++; top.firstSupportPage = reviewID; top.prevPage = reviewID; top.contentResourceID = ''; } function launchQuiz(quizID) { top.currentSupport = 0; chapterID = "knet-v214aCH47505"; nbparams = "CHAPID="+chapterID+"/RLOID="+"knet-v214aRLO47659"+"/RIOID="+"knet-v214aRIO121275"; dash = chapterID.indexOf('-'); sub1 = chapterID.substring(0,dash); sub2 = chapterID.substring(dash+1); ContentRef = "../../../../../"+ nbparams +"/"+ sub1 +"/"+ sub2 +"/"; //alert(ContentRef); eval('top.frames.main_frame.location.href="'+ContentRef+'pageframesetrio.html"'); //added for navigating between Quiz and Review and back to regular Chapter pages top.currentSupport++; top.firstSupportPage = quizID; top.prevPage = quizID; top.contentResourceID = ''; } function returnContent() { rioID = top.currentPage; rloID = top.currentRLO; ContentID = top.currentChapter; top.firstSupportPage = ''; top.prevPage = ''; top.contentResourceID = ''; top.currentSupport = 0; nbparams = "CHAPID="+ContentID+"/RLOID="+rloID+"/RIOID="+rioID; dash = ContentID.indexOf('-'); sub1 = ContentID.substring(0,dash); sub2 = ContentID.substring(dash+1); ContentRef = "../../../../../"+ nbparams +"/"+ sub1 +"/"+ sub2 +"/" eval('top.frames.main_frame.location.href="'+ContentRef+'pageframesetrio.html"'); } </script> </head> <body leftmargin="20" topmargin="10" marginwidth="30" marginheight="10" bgcolor="#FFFFFF" onLoad="window.focus();" background="../../../../../images/ccna/common/lab/bglab.gif"> <table bgcolor="#000000" cellspacing="0" width="100%" border="0"> <tr> <td width="100%"> <table cellpadding="4" cellspacing="1" width="100%" border="0"> <tr> <td width="10%" bgcolor="#FFFFFF" valign="top"> <table cellpadding="0" cellspacing="0" width="100%" border="0"> <tr> <td width="33%"><script language="JavaScript"> //if (parent.parent.getTopName() == "chapterframeset") //{ var imgSource = '../../../../../images/ccna/common/lab/labback.gif'; document.write('<a href="javascript:PrevPage();">'); document.write('<img src="' + imgSource + '" border="0">'); document.write('</a>'); //} </script></td><td width="33%"><img border="0" src="../../../../../images/ccna/common/icon4.gif"></td> </tr> </table> <p> </p> </td><td bgcolor="#FFFFFF" valign="top"> <p align="left"> <span class="resourceTitle">Lab 5.3.7 Cable Tester - Length</span> </p><p class="smtext">Estimated time: 45 min.</p><p align="left"> <span class="resourceSectionTitle">Objectives:</span> </p> <blockquote> <span class="smtext"> <ul type="disc"><li>Demonstrate skill with a cable tester more advanced than a simple continuity/pin-out tester</li><li>Use the Length features of the tester to check for opens and shorts with coax and UTP cable</li></ul> </span> </blockquote><p align="left"> <span class="resourceSectionTitle">Background:</span> </p> <blockquote> <p class="smtext">In this lab, you will learn the Cable Length feature of the Fluke 620 LAN CableMeter (or its equivalent). Cable length tests can be very helpful in troubleshooting cabling problems with UTP and coaxial cable. You will learn how to use a cable tester to check the length of Ethernet cabling to verify that it is within the standards specified and that the wires inside are the same length (for UTP). You will test different cables including UTP and Coax to determine their length.</p> <p class="smtext">The Cabling infrastructure (or cable plant) in a building is expected to last at least 10 years. Cabling related problems are one of the most common causes of network failure. The quality of cabling components used, the routing and installation of the cable and quality of the connector terminations will be the main factors in determining how trouble-free the cabling will be.</p> </blockquote><p align="left"> <span class="resourceSectionTitle">Tools / Preparation:</span> </p> <blockquote> <p class="smtext">Prior to starting the lab, the teacher or lab assistant should have several correctly wired CAT 5 cables (both straight-through and crossover) and several Coaxial (thinnet) cables to test. Cables should be numbered to simplify the testing process and to maintain consistency. A cable tester should be available that can do cable length tests for UTP and coax. Work individually or in teams. The following resources will be required:</p> <span class="smtext"> <ul type="disc"><li>CAT 5 straight or crossover cables of different colors. (some good and some bad)</li><li>Coax (thinnet) cables of different lengths</li><li>Cable Tester (Fluke 620 LAN CableMeter or similar) to test cable length</li></ul> </span> </blockquote><p align="left"> <span class="resourceSectionTitle">Related Research websites:</span> </p> <blockquote> <p class="smtext">Here are several websites where you can get additional information on cabling standards:</p> <p class="smtext"><a target="_blank" href="http://www.fluke.com/"><span class="smtext">http://www.fluke.com/</span></a> </p> </blockquote><p align="left"> <span class="resourceSectionTitle"><span class="resourceRed">Step 1 - Set the Advanced Cable Tester for the Desired Cable (UTP or COAX)</span></span> </p> <blockquote> <p class="smtext">These instructions pertain to the Fluke 620 LAN CableMeter. Turn the rotary switch selector on the tester to the LENGTH position. Press the SETUP button to enter the setup mode and observe the LCD screen on the tester. The first option should be CABLE: Press the UP or DOWN buttons until the desired cable type of UTP or COAX (thinnet) is selected. Press ENTER to accept that setting and go to the next one. Continue pressing the UP/DOWN arrows and pressing ENTER until the tester is set to the following cabling characteristics depending on the type of cable you will be testing.</p> <table border="1" cellpadding="2" cellspacing="0" width="75%" bordercolor="#000000"><tr><td class="smtext" colspan="1" rowspan="1" width="33%"><b>Tester Option </b></td><td class="smtext" colspan="1" rowspan="1" width="33%"><b>Desired Setting - UTP</b></td><td class="smtext" colspan="1" rowspan="1" width="34%"><b>Desired Setting - COAX</b></td></tr><tr><td class="smtext" colspan="1" rowspan="1" width="33%">CABLE:</td><td class="smtext" colspan="1" rowspan="1" width="33%">UTP </td><td class="smtext" colspan="1" rowspan="1" width="34%">COAX</td></tr><tr><td class="smtext" colspan="1" rowspan="1" width="33%">WIRING: </td><td class="smtext" colspan="1" rowspan="1" width="33%">10BASE-T or EIA/TIA 4PR</td><td class="smtext" colspan="1" rowspan="1" width="34%">10BASE2 or RG58 (thinnet)</td></tr><tr><td class="smtext" colspan="1" rowspan="1" width="33%">CATEGORY:</td><td class="smtext" colspan="1" rowspan="1" width="33%">CAT 5</td><td class="smtext" colspan="1" rowspan="1" width="34%">N/A</td>⌨️ 快捷键说明
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