Black Box TS580A-R4 Page 76 724-746-5500| blackbox.com, Appendix C: Examples of UTP Cable Faults

Appendix C: Examples of UTP Cable Faults

The screen shows a 330-foot cable with split pairs at 154 feet. If the cable goes through a wiring closet, it is possible the split pairs are in the closet (154 feet away). This screen shows one of the advantages the LPV has over testers costing thousands of dollars more. The LPV shows the distance to the split pair to help locate it and facilitate repair. High-cost certifiers display dBs of crosstalk but do not help you locate the repairable split pair fault. Turn on the trace tones and use the probe to locate the cable in the wiring closet. Test each cable associated with the link (patch cables, etc).

Bad cable (Near end shorts): The error is displayed as follows:

Figure C-3. Bad cable: near-end short.

The SHORT on 12> is most likely at the connector (near end). If the short is on the far end of the cable it would look like this:

Figure C-4. Bad cable: far-end short

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