Copper Cabling Troubleshooting Handbook
Страница 1: ...Copper Cabling Troubleshooting Handbook...
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Страница 3: ...e automated DSX 600 diagnostics 9 Shield Integrity Test 11 HDTDR diagnostics 13 HDTDX diagnostics 15 Causes of Cabling Faults 17 Wiremap 17 Length 19 Delay Skew 19 Insertion Loss Attenuation 19 NEXT a...
Страница 4: ...stems Why the need for advanced diagnostics As newer high performance cabling systems have been developed and deployed every aspect of the installation demands a higher level of skill and more attenti...
Страница 5: ...e you using the appropriate test adapter with a plug that matches the jack in the telecommunication outlet TO or the patch panel Has the test reference been set in the last 30 days It is recommended t...
Страница 6: ...urements Figure 1 To obtain meaningful results it is essential to select the appropriate autotest and link model Permanent Link The Permanent Link performance is defined in such a way that after addin...
Страница 7: ...cable portion of the test lead is removed from the measurement using calibration constants stored in the adapter Another Permanent Link configuration that s being seen more often nowadays is the Modif...
Страница 8: ...form Channel tests at the conclusion of a new installation since the patch cords that belong to each link are rarely available at that time Correct Channel measurements must cancel the effects of the...
Страница 9: ...arameter For example in figure 3 the Return Loss accuracy is 1 79 dB 22 5 MHz and the worst case margin of a link at 22 5MHz was 0 4 dB This Return Loss result at 22 5 MHz is considered very close to...
Страница 10: ...NUE which continues the test with the bad wire map this may allow you to find other issues to help you troubleshoot the problem in the link Figure 4 shows such a wire map failure The DSX 600 main unit...
Страница 11: ...as connected even if one of the ends is not That s because the shield test is a simple DC Resistance measurement If the shield is open it will find the remote unit using the building ground earth or...
Страница 12: ...data in the time domain is in turn converted to a profile of the measured disturbance along the length of the link Figure 6 The DSX 600 CableAnalyzer can make Shield integrity measurements using TDR t...
Страница 13: ...ges cause signal reflections that contribute to the measured Return Loss value If these reflections become too big and the total amount of energy reflected exceeds the maximum amount allowed the Retur...
Страница 14: ...s run the HDTDR diagnostics the results of which are shown in figure 8 First let s find and view the worst pair which was pair 7 8 Now let s pinch and zoom on the vertical axis to see the 1 horizonta...
Страница 15: ...let s do the HDTDX diagnostic test and view the worst pair 3 6 4 5 and seen in figure 12 So let s make a HDTDR diagnostic measurement on this link to see if it can tell us where the water is We can s...
Страница 16: ...e link at 6 0 meters This is not ideal In addition we see some aberrations between the first and second pulse This indicates NEXT along the cable maybe the cable has been damaged Events in the cable s...
Страница 17: ...ar end connector far exceeds the ideal of 30 it s nearly 60 So we could re terminate the connector which may allow the link to pass However if we further analyze the HDTDX trace we also see that there...
Страница 18: ...does not make contact in the IDC Damaged connector Cuts or breaks in cable Wires connected to wrong pins at connector or punch block Application specific cable e g Ethernet using 1 2 3 6 only Short I...
Страница 19: ...ew Test Result Possible Cause of Result Exceeds limits Excessive length Non twisted or poor quality patch cables High impedance connections Use time domain techniques to troubleshoot Inappropriate cab...
Страница 20: ...cessive compression caused by plastic cable ties Excessive noise source adjacent to measurement Unexpected PASS Knots or kinks do not always cause NEXT failures especially on good cable and far remove...
Страница 21: ...t 100 ohm Impedance mismatch at junction between patch cable and horizontal cable Poorly matched plug and jack Use of 120 ohm cable Service loops in telecommunications closet Inappropriate autotest se...
Страница 22: ...XT problems Service loops with many tightly coiled windings ACR F and PS ACR F older names ELFEXT and PSELFEXT Test Result Possible Cause of Result FAIL or PASS Excessive cable length Poor connection...
Страница 23: ...Consult the Fluke Networks web page for product information as well as updates in standards or white papers on best practices Go to www flukenetworks com design Architects Consultants and Designers pa...
Страница 24: ...the nature of typical faults and how the tester s diagnostics report them you can significantly reduce the time to correct an anomaly an installation error or a defective component Personnel responsi...
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Страница 26: ...Info Troubleshooting X PoE Resistance Unbalance X Integrated Alien Crosstalk Capability X Coax Adapters Optional M12 Adapters Optional Patch Cord Adapters X Fiber OLTS OTDR Inspection X The DSX 600 p...
Страница 27: ...Optional Optional Optional Optional Optional The modular Versiv family Future ready design supports up to TIA Cat 8 and ISO Class I II singlemode and multimode fiber loss and OTDR testing plus inspect...
Страница 28: ...kenetworks com contact 2017 Fluke Corporation All rights reserved 7 2017 7001958B Ensure the fiber based network goes up and stays up For additional resources to help you establish Fiber Testing Best...
