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While making my own cat6 cables, I notice that every now and then, even though I push the cables all the way to the end that it will allow, my tester states FAIL and it shows certain wires blinking (like 1 and 8). How do I know which end is at fault and causing the fail (besides hoping I redo the correct side and, most of the time, having to redo the other side as well)? For reference, my tester is a Monoprice MCT-2690PRO.

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Aren't the plugs made of see-thru plastic? At least with a magnifier you should see it. Can you take pictures of the plugs of a faulty cable and show them here? –  ott-- Feb 8 '13 at 10:10
    
Unfortunately I already redid the cable. –  Gabriel Graves Feb 8 '13 at 10:14
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it might also be faulty in the middle, in theory –  Journeyman Geek Feb 8 '13 at 10:25
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I'm going to rule that out as all the faulty cables I have are fixed after redoing the ends. Thumbs up though. –  Gabriel Graves Feb 8 '13 at 10:38
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You can't tell which end. –  Ramhound Feb 8 '13 at 12:09

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It turns out that if you use the length option on the tester that anything with 0 in length could signal a possible wiring error. The only exception to this that I've found is if my wire is 2-3ft or less in length.

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What's the length option? –  cpast Feb 10 '13 at 21:05
    
One of the buttons/features that measures the length of the cord. I never use it because it is always inaccurate and each pair is different (sometimes by a foot). –  Gabriel Graves Feb 10 '13 at 21:07

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