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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-v214aCH47509'; 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-v214aCH47509"; nbparams = "CHAPID="+chapterID+"/RLOID="+"knet-v214aRLO47801"+"/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-v214aCH47509"; nbparams = "CHAPID="+chapterID+"/RLOID="+"knet-v214aRLO47808"+"/RIOID="+"knet-v214aRIO123593"; 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%"></td> </tr> </table> <p> </p> </td><td bgcolor="#FFFFFF" valign="top"> <p align="left"> <span class="resourceTitle">9.2.12 Procedure for punching wires down into a jack</span> </p><object height="100%" width="100%" codebase="http://active.macromedia.com/flash4/cabs/swflash.cab#version=4,0,0,0" classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"><param name="movie" value="../../../../../CHAPID=knet-v214aCH47509/RLOID=knet-v214aRLO47801/RIOID=knet-v214aRIO123554/knet/v214aVID4597/9_2_12.swf"><param value="high" name="quality"> <embed height="100%" width="100%" pluginspage="http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash" type="application/x-shockwave-flash" quality="high" src="../../../../../CHAPID=knet-v214aCH47509/RLOID=knet-v214aRLO47801/RIOID=knet-v214aRIO123554/knet/v214aVID4597/9_2_12.swf"> </embed> </object>Instructor Note<p class="smtext">The punch-down procedure is described. The most common error is that students will have the blade facing the wrong way, and cut off the wire inside the jack instead of trimming the excess wire from outside the jack. You may want to point out that this same procedure is used to punch down into a patch panel, another necessary skill for cable installation.</p><p class="smtext">The lab activity requires approximately 45 minutes.</p><a href="#" onClick="javascript:launchReference('knet-v214aRIO125370', 'null', 'null');void(null);">Lab Activity</a><p class="smtext">In this lab, you will learn the correct process for terminating a RJ-45 jack as well as the correct procedure for installing the jack in a wall plate.</p><p class="smtext">Use a punch tool to punch down the wires into the jack. A punch tool is a device that uses spring-loaded action to push wires between metal pins, while at the same time, skinning the sheath away from the wire. This ensures that the wire makes a good electrical connection with the pins inside the jack. The punch tool also cuts off any extra wire.</p><p class="smtext">When using the punch tool, begin by positioning the blade on the outside of the jack. If the blade is placed on the inside of the jack, the wire will be cut short of the connection point. If this happens, no electrical connection can occur. If any wire remains attached after using the punch tool, simply twist the ends gently to remove them. Then place the clips on the jack and tighten them. To snap the jack into its faceplate, push it in from the back side. Make sure that the jack is right-side up when doing this. Then use the screws to attach the faceplate to either the box or to the bracket.</p><table cellpadding="0" cellspacing="0" border="0"> <tr> <td width="100%"><img height="10" width="1" border="0" src="../../../../../images/ccna/common/transdot.gif"></td> </tr> <tr> <td width="100%"> <table bgcolor="#000000" bordercolor="#000000" cellspacing="0" bordercolorlight="#000000" width="100%" border="0"> <tr> <td width="100%"> <table bgcolor="#FFFFFF" width="100%" cellspacing="0" cellpadding="3" border="0"> <tr> <td><span class="note"><b>NOTE:</b><p class="smtext">Tilt the handle of the punch tool a little to the outside and it will cut better.</p></span></td> </tr> </table> </td> </tr> </table> </td> </tr> </table><p class="smtext">If the box has been surface mounted, keep in mind that it may hold 30-60 cm of excess cable. In order to push the rest of the excess cable back into the wall, either slide the cable through its tie-wraps or pull back the raceway that covers it. If the jack has been flush-mounted, simply push the excess cable back into the wall.</p>Web Links<a target="_blank" href="http://www.siemon.com/glossary/definitions.html"><span class="smtext">Cabling Glossary</span></a></td> </tr> </table> </td> </tr> </table> </body></html>⌨️ 快捷键说明
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