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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 5.3.3 Rollover 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 rollover cable for connection from a workstation to the console port on a router or switch</li></ul> </span> </blockquote><p align="left"> <span class="resourceSectionTitle">Background:</span> </p> <blockquote> <p class="smtext">In this lab you learn how to build a Category 5 (CAT 5) Unshielded Twisted Pair (UTP) console rollover cable and test it for good connections (continuity) and correct pinouts (correct wire on the right pin). This will be a four-pair (eight wires) "rollover" cable.</p> <p class="smtext">This cable should be approximately 10 feet in length but can be as long as 25 feet. It can be used to connect a workstation or dumb terminal to the console port on the back of a router or Ethernet switch in order to be able to configure the router or switch. This cable uses an asynchronous serial interface to the router or switch (eight data bits, No parity and two Stop bits). Both ends of the cable you build will have RJ-45 connectors on them. One end plugs directly into the RJ-45 console management port on the back of the router or switch and the other end plugs into an RJ-45-to-DB9 terminal adapter. This adapter converts the RJ 45 to a 9-pin female D connector that plugs into the DB9 serial port male adapter on the back of a PC running terminal emulation software such as HyperTerminal. A DB25 terminal adapter is also available to connect with a dumb terminal that has a 25 pin connector.</p> <p class="smtext">A rollover cable uses eight pins but is different from the straight-through cable or crossover cable that you will build in other labs. With a rollover cable, pin 1 on one end connects to pin 8 on the other end. Pin 2 connects to pin 7, pin 3 connects to pin 6 and so on. This is why it is referred to as a rollover since the pins on one end are all reversed on the other end as though one end of the cable was just rotated or rolled over.</p> <p class="smtext">A flat black or light blue rollover cable comes with each new router or switch along with the terminal adapters for both DB9 and DB25 connections to terminals or PC serial ports. It is approximately 8 feet long. This lab will enable you to build another cable if the one that comes with the router or switch is damaged or lost. It will also allow you to connect to routers or switches from workstations that are greater than 8 feet away by building your own longer cables.</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 (eight pin) connectors, an RJ-45 crimping tool and a continuity tester available. Work individually or in teams. The following resources will be required:</p> <span class="smtext"> <ul type="disc"><li>10 to 20 foot length of Cat 5 cabling (one per person or one per team) Four RJ-45 connectors (two extra for spares)</li><li>RJ-45 crimping tools to attach the RJ-45 connectors to the cable end</li><li>An RJ-45 to DB9 female terminal adapter (available from Cisco)</li><li>Cabling continuity tester</li><li>Wire cutters</li></ul> </span> </blockquote><p align="left"> <span class="resourceSectionTitle"><span class="resourceRed">Step 1 - Review Cable Connections and Pin Locations</span></span> </p> <blockquote> <p class="smtext">Use the table as a reference to answer the questions below and to help you create a rollover console cable.</p> <p class="smtext"> <b>Questions:</b> </p> <span class="smtext"> <ol><li>Which signal on the Router port (first column of the table) will be used to transmit data to the PC when the PC is first connected and HyperTerminal is started (this is what displays the router prompt on the workstation)?<p class="smtext">⌨️ 快捷键说明
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