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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%"></td> </tr> </table> <p> </p> </td><td bgcolor="#FFFFFF" valign="top"> <p align="left"> <span class="resourceTitle">5.3.2 Making and testing Ethernet 10BASE-T straight-through patch cable</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-v214aCH47505/RLOID=knet-v214aRLO47654/RIOID=knet-v214aRIO121184/knet/v214aVID4774/5_3_2.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-v214aCH47505/RLOID=knet-v214aRLO47654/RIOID=knet-v214aRIO121184/knet/v214aVID4774/5_3_2.swf"> </embed> </object>Instructor Note<p class="smtext">Why is cable termination taught at all in the CNAP, given that cabling is not actually tested on the CCNA exam? We refer back to the rationale given for teaching electronics. A well-educated networking professional should have awareness of cabling and termination standards. Not to mention that an estimated 70% of network troubleshooting involves Layer 1 issues. Finally, we know of no better way to teach students the precision dictated by the cabling standards then to have students engage in the challenging, fun, and widely useful skill of making some cables. Of course, entire courses on network cabling exist and are quite valuable. We are not trying to substitute for them with these labs, but trying to introduce students to the topic.</p><p class="smtext">The purpose of this target indicator, a lab activity, is for the students to demonstrate a fundamental termination skill. The creation of a straight-through patch cable according to TIA/EIA-568-A standards. While such cables are easily purchased, many times a cable of a peculiar length might be desired for test purposes, or an existing cable or cable run may need re-termination. Stranded, not solid, cable should be used for making real patch cables. If stranded is not available, then proceed with the lab using solid.</p><p class="smtext">This lab activity requires approximately 30 minutes. This TI relates to the Layer 1 part of CCNA Certification Exam Objective #1.</p><a href="#" onClick="javascript:launchReference('knet-v214aRIO125217', 'null', 'null');void(null);">Lab Activity</a><p class="smtext">In this lab you will use the following steps to make and test a straight-through patch cable.</p><p class="smtext">As specified in the 568 standards, your cable may have a maximum length of 3 m.</p><p class="smtext">As specified in the 568 standards, your cable may have a maximum length of 3 m.</p><table border="0" cellpadding="3" cellspacing="0" width="100%" bordercolor="#000000"><tr><td class="smtext" align="left" colspan="1" rowspan="1" valign="top" width="24"><img border="0" src="../../../../../CHAPID=knet-v214aCH47505/RLOID=knet-v214aRLO47654/RIOID=knet-v214aRIO121184/knet/v214adataimage1/1.gif" width="12" height="12"></td><td class="smtext" colspan="1" rowspan="1" width="671">Cut a length of cable.</td></tr><tr><td class="smtext" align="left" colspan="1" rowspan="1" valign="top" width="24"><img border="0" src="../../../../../CHAPID=knet-v214aCH47505/RLOID=knet-v214aRLO47654/RIOID=knet-v214aRIO121184/knet/v214adataimage2/2.gif" width="12" height="12"></td><td class="smtext" colspan="1" rowspan="1" width="671">Strip off the jacket.</td></tr><tr><td class="smtext" align="left" colspan="1" rowspan="1" valign="top" width="24"><img border="0" src="../../../../../CHAPID=knet-v214aCH47505/RLOID=knet-v214aRLO47654/RIOID=knet-v214aRIO121184/knet/v214adataimage3/3.gif" width="12" height="12"></td><td class="smtext" colspan="1" rowspan="1" width="671">Separate out the 4 pairs of wires.</td></tr><tr><td class="smtext" align="left" colspan="1" rowspan="1" valign="top" width="24"><img border="0" src="../../../../../CHAPID=knet-v214aCH47505/RLOID=knet-v214aRLO47654/RIOID=knet-v214aRIO121184/knet/v214adataimage4/4.gif" width="12" height="12"></td><td class="smtext" colspan="1" rowspan="1" width="671">Untwist the wires.</td></tr><tr><td class="smtext" align="left" colspan="1" rowspan="1" valign="top" width="24"><img border="0" src="../../../../../CHAPID=knet-v214aCH47505/RLOID=knet-v214aRLO47654/RIOID=knet-v214aRIO121184/knet/v214adataimage5/5.gif" width="12" height="12"></td><td class="smtext" colspan="1" rowspan="1" width="671">Organize the wires according to the proper color code and flatten the wires.</td></tr><tr><td class="smtext" align="left" colspan="1" rowspan="1" valign="top" width="24"><img border="0" src="../../../../../CHAPID=knet-v214aCH47505/RLOID=knet-v214aRLO47654/RIOID=knet-v214aRIO121184/knet/v214adataimage6/6.gif" width="12" height="12"></td><td class="smtext" colspan="1" rowspan="1" width="671">Maintain the color order and flatness of the wires, then clip their length so that a maximum of 1.2 cm of untwisted wire is present.</td></tr><tr><td class="smtext" align="left" colspan="1" rowspan="1" valign="top" width="24"><img border="0" src="../../../../../CHAPID=knet-v214aCH47505/RLOID=knet-v214aRLO47654/RIOID=knet-v214aRIO121184/knet/v214adataimage7/7.gif" width="12" height="12"></td><td class="smtext" colspan="1" rowspan="1" width="671">Insert ordered wires into RJ-45 plug; make sure jackets are inserted into plug.</td></tr><tr><td class="smtext" align="left" colspan="1" rowspan="1" valign="top" width="24"><img border="0" src="../../../../../CHAPID=knet-v214aCH47505/RLOID=knet-v214aRLO47654/RIOID=knet-v214aRIO121184/knet/v214adataimage8/8.gif" width="12" height="12"></td><td class="smtext" colspan="1" rowspan="1" width="671">Push the wires in firmly enough to make sure the conductors are all visible when you look at the plug from the end.</td></tr><tr><td class="smtext" align="left" colspan="1" rowspan="1" valign="top" width="24"><img border="0" src="../../../../../CHAPID=knet-v214aCH47505/RLOID=knet-v214aRLO47654/RIOID=knet-v214aRIO121184/knet/v214adataimage9/9.gif" width="12" height="12"></td><td class="smtext" colspan="1" rowspan="1" width="671">Inspect the color code and jacket location to be sure they are correct.</td></tr><tr><td class="smtext" align="left" colspan="1" rowspan="1" valign="top" width="24"><img border="0" src="../../../../../CHAPID=knet-v214aCH47505/RLOID=knet-v214aRLO47654/RIOID=knet-v214aRIO121184/knet/v214adataimage10/10.gif" width="20" height="12"></td><td class="smtext" colspan="1" rowspan="1" width="671">Insert the plug firmly into the crimp tool and crimp down completely.</td></tr><tr><td class="smtext" align="left" colspan="1" rowspan="1" valign="top" width="24"><img border="0" src="../../../../../CHAPID=knet-v214aCH47505/RLOID=knet-v214aRLO47654/RIOID=knet-v214aRIO121184/knet/v214adataimage11/11.gif" width="20" height="12"></td><td class="smtext" colspan="1" rowspan="1" width="671">Inspect both ends visually and mechanically.</td></tr><tr><td class="smtext" align="left" colspan="1" rowspan="1" valign="top" width="24"><img border="0" src="../../../../../CHAPID=knet-v214aCH47505/RLOID=knet-v214aRLO47654/RIOID=knet-v214aRIO121184/knet/v214adataimage12/12.gif" width="20" height="12"></td><td class="smtext" colspan="1" rowspan="1" width="671">Use a cable tester to verify the quality of the cable.</td></tr></table></td> </tr> </table> </td> </tr> </table> </body></html>⌨️ 快捷键说明
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