{"id":10719,"date":"2018-08-13T01:19:02","date_gmt":"2018-08-13T01:19:02","guid":{"rendered":"https:\/\/www.tarluz.com\/?p=10719"},"modified":"2018-08-13T01:26:52","modified_gmt":"2018-08-13T01:26:52","slug":"causes-of-cabling-faults-for-copper-patch-cord-in-structured-cabling-network","status":"publish","type":"post","link":"https:\/\/www.tarluz.com\/ar\/copper-network\/causes-of-cabling-faults-for-copper-patch-cord-in-structured-cabling-network\/","title":{"rendered":"Causes of cabling faults for copper patch cord in structured cabling network"},"content":{"rendered":"

For each of the required TIA and ISO structured cabling measurements, you will find troubleshooting tips to help quickly pinpoint the cause of failures when they occur. In some examples, you will find suggested reasons why the measurement does not fail in cases you would expect to see a failure.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Wiremap<\/td>\n<\/td>\n<\/tr>\n
Test Result<\/td>\nPossible Cause of Result<\/td>\n<\/tr>\n
Open<\/td>\nWires broken by stress at connections<\/td>\n<\/tr>\n
Cables routed to wrong connection<\/td>\n<\/tr>\n
Wire is not punched down properly and does not make contact in the IDC<\/td>\n<\/tr>\n
Damaged connector<\/td>\n<\/tr>\n
Cuts or breaks in cable<\/td>\n<\/tr>\n
Wires connected to wrong pins at connector or punch block<\/td>\n<\/tr>\n
Application-specific cable (e.g. Ethernet using 1,2\/3,6 only)<\/td>\n<\/tr>\n
Wires connected to wrong pins at connector or punch block<\/td>\n<\/tr>\n
Wires connected to wrong pins at connector or punch block<\/td>\n<\/tr>\n
Short<\/td>\nImproper connector termination<\/td>\n<\/tr>\n
Damaged connector<\/td>\n<\/tr>\n
Conductive material stuck between pins at a connection Damage to cable<\/td>\n<\/tr>\n
Application specific cable (e.g. factory automation)<\/td>\n<\/tr>\n
Reversed pair<\/td>\nWires connected to wrong pins at connector or punch block<\/td>\n<\/tr>\n
Crossed pair<\/td>\nWires connected to wrong pins at connector or punch block<\/td>\n<\/tr>\n
Mix of 568A and 568B wiring standards (1,2 and 3,6 crossed)<\/td>\n<\/tr>\n
Crossover cables used (1,2 and 3,6 crossed)<\/td>\n<\/tr>\n
Split pair<\/td>\nWires connected to wrong pins at connector or punch block<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n\n\n
Length<\/td>\n<\/td>\n<\/tr>\n
Open<\/td>\nPossible Cause of Result<\/td>\n<\/tr>\n
Length exceeds limits<\/td>\nCable is too long \u2013 check for coiled service loops and remove in this case<\/td>\n<\/tr>\n
NVP (nominal Velocity of Propogation) is set incorrectly<\/td>\n<\/tr>\n
One or more pairs significantly shorter<\/td>\nIntermediate break in the cable<\/td>\n<\/tr>\n
NVP is set incorrectly<\/td>\n<\/tr>\n
One or more pairs significantly shorter<\/td>\nDamage to cable<\/td>\n<\/tr>\n
Bad connection<\/td>\n<\/tr>\n
Note: Standard practices dictate that the cabling length be defined by the length of the shortest pair. NVP varies per pair, meaning each pair could be reported with a different length. These two conditions can result in a cable with three of four pairs over the length limit, yet the link result is a PASS (e.g. a channel with 101, 99, 103, 102 meters for the four pairs). A PASS in this case is the correct interpretation.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n\n\n\n\n\n\n
Delay\/Skew<\/td>\n<\/td>\n<\/tr>\n
Open<\/td>\nPossible Cause of Result<\/td>\n<\/tr>\n
Exceeds limits<\/td>\nCable is too long \u2013 Propagation Delay<\/td>\n<\/tr>\n
Cable uses different insulation materials on different pairs \u2013 Delay Skew<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n
Insertion Loss (Attenuation)<\/td>\n<\/td>\n<\/tr>\n
Open<\/td>\nPossible Cause of Result<\/td>\n<\/tr>\n
Exceeds limits<\/td>\nExcessive length<\/td>\n<\/tr>\n
Non-twisted or poor quality patch cables<\/td>\n<\/tr>\n
High impedance connections \u2013 Use time domain techniques to troubleshoot<\/td>\n<\/tr>\n
Inappropriate cable category \u2013 e.g. Cat 3 in a Cat 5e applications<\/td>\n<\/tr>\n
Incorrect autotest selected for cabling under test<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
NEXT and PSNEXT<\/td>\n<\/td>\n<\/tr>\n
Open<\/td>\nPossible Cause of Result<\/td>\n<\/tr>\n
FAIL or PASS*<\/td>\nPoor twisting at connection points<\/td>\n<\/tr>\n
Poorly matched plug and jack (Category 6\/Class E applications)<\/td>\n<\/tr>\n
Incorrect link adapter (Cat 5 adapter for Cat 6 links) Poor quality patch cords<\/td>\n<\/tr>\n
Bad connectors<\/td>\n<\/tr>\n
Bad cable<\/td>\n<\/tr>\n
Split pairs<\/td>\n<\/tr>\n
Inappropriate use of couplers<\/td>\n<\/tr>\n
Excessive compression caused by plastic cable ties Excessive noise source adjacent to measurement<\/td>\n<\/tr>\n
Unexpected PASS<\/td>\nKnots or kinks do not always cause NEXT failures, especially on good cable and far removed from the ends of the link<\/td>\n<\/tr>\n
Incorrect autotest selected (e.g. \u201cBad\u201d Cat 6 link tested to Cat 5 limits)<\/td>\n<\/tr>\n
\u201cFails\u201d at low frequency on NEXT graph but passes overall. When using the ISO\/IEC standards, the so called 4dB rule states all NEXT results measured while insertion loss <4dB cannot fail<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Return Loss<\/td>\n<\/td>\n<\/tr>\n
Open<\/td>\nPossible Cause of Result<\/td>\n<\/tr>\n
FAIL or PASS*<\/td>\nPatch cord impedance not 100 ohms<\/td>\n<\/tr>\n
Patch cord mishandling causes changes in impedance<\/td>\n<\/tr>\n
Installation practices (untwists or kinks of cable – the original twists should be maintained as much as possible for each wire pair)<\/td>\n<\/tr>\n
Excessive amount of cable jammed into the Telecom Outlet box<\/td>\n<\/tr>\n
Bad connector<\/td>\n<\/tr>\n
Cable impedance not uniform<\/td>\n<\/tr>\n
Cable not 100 ohm<\/td>\n<\/tr>\n
Impedance mismatch at junction between patch cable and horizontal cable<\/td>\n<\/tr>\n
Poorly matched plug and jack<\/td>\n<\/tr>\n
Use of 120 ohm cable<\/td>\n<\/tr>\n
Service loops in telecommunications closet Inappropriate autotest selected<\/td>\n<\/tr>\n
Defective link adapter<\/td>\n<\/tr>\n
Unexpected PASS<\/td>\nKnots or kinks do not always cause return loss failures, especially on good cable and far removed from the ends of the link<\/td>\n<\/tr>\n
Incorrect autotest selected (easier to pass RL limits)<\/td>\n<\/tr>\n
\u201cFAILs\u201d at low frequency on RL graph but passes overall. Due to the 3 dB rule, whereby all RL results measured while insertion loss <3 dB cannot fail<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n\n\n\n\n\n\n\n
ACR-F and PS ACR-F<\/td>\n<\/td>\n<\/tr>\n
(older names: ELFEXT and PSELFEXT)<\/td>\n<\/td>\n<\/tr>\n
Open<\/td>\nPossible Cause of Result<\/td>\n<\/tr>\n
Possible Cause of Result<\/td>\nGeneral rule: troubleshoot NEXT problems first. This normally corrects any ACR-F (ELFEXT) problems<\/td>\n<\/tr>\n
Service loops with many tightly coiled windings<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n\n\n\n\n\n\n\n\n
Resistance<\/td>\n<\/td>\n<\/tr>\n
Open<\/td>\nPossible Cause of Result<\/td>\n<\/tr>\n
FAIL or PASS*<\/td>\nExcessive cable length<\/td>\n<\/tr>\n
Poor connection due to oxidized contacts<\/td>\n<\/tr>\n
Poor connection due to marginally attached conductors Thinner gauge cable<\/td>\n<\/tr>\n
Incorrect patch cord type<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

For each of the required TIA and ISO structured cabling measurements, you will find troubleshooting tips to help quickly pinpoint the cause of failures when they occur. In some examples, you will find suggested reasons why the measurement does not fail in cases you would expect to see a failure. Wiremap Test Result Possible Cause […]<\/p>\n","protected":false},"author":1,"featured_media":10872,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[408,399],"tags":[1422],"class_list":["post-10719","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-copper-network","category-data-center","tag-copper-patch-cord"],"yoast_head":"\nCauses of cabling faults for copper patch cord in structured cabling network - TARLUZ - FIBER OPTIC SUPPLIERS<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.tarluz.com\/ar\/copper-network\/causes-of-cabling-faults-for-copper-patch-cord-in-structured-cabling-network\/\" \/>\n<meta property=\"og:locale\" content=\"ar_AR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Causes of cabling faults for copper patch cord in structured cabling network\" \/>\n<meta property=\"og:description\" content=\"For each of the required TIA and ISO structured cabling measurements, you will find troubleshooting tips to help quickly pinpoint the cause of failures when they occur. In some examples, you will find suggested reasons why the measurement does not fail in cases you would expect to see a failure. Wiremap Test Result Possible Cause […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.tarluz.com\/ar\/copper-network\/causes-of-cabling-faults-for-copper-patch-cord-in-structured-cabling-network\/\" \/>\n<meta property=\"og:site_name\" content=\"TARLUZ - FIBER OPTIC SUPPLIERS\" \/>\n<meta property=\"article:published_time\" content=\"2018-08-13T01:19:02+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2018-08-13T01:26:52+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.tarluz.com\/wp-content\/uploads\/2018\/08\/Copper-Patch-cord-troubleshooting.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"598\" \/>\n\t<meta property=\"og:image:height\" content=\"357\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"TARLUZ.COM\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u0643\u064f\u062a\u0628 \u0628\u0648\u0627\u0633\u0637\u0629\" \/>\n\t<meta name=\"twitter:data1\" content=\"TARLUZ.COM\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u0648\u0642\u062a \u0627\u0644\u0642\u0631\u0627\u0621\u0629 \u0627\u0644\u0645\u064f\u0642\u062f\u0651\u0631\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 \u062f\u0642\u0627\u0626\u0642\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.tarluz.com\\\/ar\\\/copper-network\\\/causes-of-cabling-faults-for-copper-patch-cord-in-structured-cabling-network\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.tarluz.com\\\/ar\\\/copper-network\\\/causes-of-cabling-faults-for-copper-patch-cord-in-structured-cabling-network\\\/\"},\"author\":{\"name\":\"TARLUZ.COM\",\"@id\":\"https:\\\/\\\/www.tarluz.com\\\/ar\\\/#\\\/schema\\\/person\\\/5740f1b7210de5d651317604459f2fb1\"},\"headline\":\"Causes of cabling faults for copper patch cord in structured cabling network\",\"datePublished\":\"2018-08-13T01:19:02+00:00\",\"dateModified\":\"2018-08-13T01:26:52+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.tarluz.com\\\/ar\\\/copper-network\\\/causes-of-cabling-faults-for-copper-patch-cord-in-structured-cabling-network\\\/\"},\"wordCount\":773,\"image\":{\"@id\":\"https:\\\/\\\/www.tarluz.com\\\/ar\\\/copper-network\\\/causes-of-cabling-faults-for-copper-patch-cord-in-structured-cabling-network\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.tarluz.com\\\/wp-content\\\/uploads\\\/2018\\\/08\\\/Copper-Patch-cord-troubleshooting.jpg\",\"keywords\":[\"Copper Patch Cord\"],\"articleSection\":[\"Copper Network\",\"Data Center\"],\"inLanguage\":\"ar\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.tarluz.com\\\/ar\\\/copper-network\\\/causes-of-cabling-faults-for-copper-patch-cord-in-structured-cabling-network\\\/\",\"url\":\"https:\\\/\\\/www.tarluz.com\\\/ar\\\/copper-network\\\/causes-of-cabling-faults-for-copper-patch-cord-in-structured-cabling-network\\\/\",\"name\":\"Causes of cabling faults for copper patch cord in structured cabling network - 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