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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 5.3.4 Crossover Cable</span> </p><p class="smtext">Estimated time: 30 min.</p><p align="left"> <span class="resourceSectionTitle">Objectives:</span> </p> <blockquote> <span class="smtext"> <ul type="disc"><li>Build a crossover Ethernet patch cable to T568-B (or T-568-A) standards for connection from workstation to workstation or from switch to switch.</li></ul> </span> </blockquote><p align="left"> <span class="resourceSectionTitle">Background:</span> </p> <blockquote> <p class="smtext">In this lab you will learn how to build a Category 5 (CAT 5) Unshielded Twisted Pair (UTP) Ethernet crossover network cable and test it for good connections (continuity) and correct pinouts (correct color of wire on the right pin). This will be a four-pair (eight wires) "crossover" cable which means that pairs two and three on one end of the cable will be reversed on the other end. It will be wired to TIA/EIA-568-B and A standards for 10BASE-T Ethernet which determines what color wire is on each pin. The pinouts will be T568-A on one end and T568-B on the other end. All eight conductors (wires) should be terminated with RJ-45 modular connectors.</p> <p class="smtext">This patch cable will conform to the structured cabling standards and, if it is used between hubs or switches, is considered to be part of the "vertical" cabling also know as backbone cable. A crossover cable can be used as a backbone cable to connect two or more hubs or switches in a LAN or to connect two isolated workstations to create a mini LAN. This will allow you to connect two workstations together or a server and a workstation without the need for a hub between them. This can be very helpful for training and testing. If you want to connect more than two workstations you will need a hub or a switch.</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 a spool of Cat 5 Unshielded Twisted Pair (UTP) cable, RJ-45 (8-pin) connectors, a RJ-45 crimping tool and an Ethernet / RJ-45 continuity tester available. Work individually or in teams. The following resources will be required:</p> <span class="smtext"> <ol><li>Two to three foot length of Cat 5 cabling (one per person or one per team)</li><li>Four RJ-45 connectors (two extra for spares)</li><li>RJ-45 crimping tools to attach the RJ-45 connectors to the cable ends</li><li>Ethernet cabling continuity tester that can test crossover type cables (T568-A to T568-B).</li><li>Wire cutters</li></ol> </span> </blockquote><p align="left"> <span class="resourceSectionTitle"><span class="resourceRed">Step 1 - Create a crossover patch panel cable.</span></span> </p> <blockquote> <p class="smtext">Use the following tables and diagrams and steps to create a crossover cable. One end of the cable should be wired to the T568-A standard and the other end to the T568-B standard. This crosses the transmit and receive pairs (2 and 3) to allow communication to take place. Only four wires are used with 10BASE-T or 100BASE-TX Ethernet:</p> <p class="smtext"> <b>T568-A Cabling</b> </p>⌨️ 快捷键说明
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