Ethernet Cable Pair shorts

I have a cheap cable tester that is saying all the pairs of a CAT6 cable are shorted together.  I verified that the tester is correct by cutting up a cable and shorting the pairs together, the tester will correctly identify which ones are shorted and when all are shorted.  I cant wrap my head around how a cable pairs can all be shorted together.  I am using Belden CAT6 cable and CAT6 rated connectors by platinum tools.  Does anyone have some insight into this?
cameljoe121Asked:
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Paul MacDonaldDirector, Information SystemsCommented:
In my experience, when one cuts the cable jacket it's very easy to also nick the insulation on the conductors.  If two adjacent conductors both have nicks in their insulation, they can come in contact with each other.  

If this happens where the cable can't move (in the connector itself, say), the short will probably be permanent.  

If this happens where the cable can flex, you may see an intermittent short.
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
Are you sure that your cable tester is working?  Another way to verify if cables are shorted is to use a multimeter and use the Ohm meter settings.  Check each pair to ensure there is no short.
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CompProbSolvCommented:
I'm assuming here that you are constructing the cable and not using a pre-made cable.  I'd proceed as follows:

Check your tester with a pre-made (presumed good) cable to confirm that it doesn't show any shorts.

Test a loose connector with the tester to confirm that it doesn't indicate any shorts.  (I'm assuming that your tester can do this from one end.  The tester make and model would be very helpful here.)

Attach the tested connector to a length of cable.

Test the assembled "half-cable".

Test another loose connector.

Attach the second connector to the other end of the cable.

Test the assembled cable.

Mohammed makes a good suggestion about using an ohmmeter, but I'd push it further.  If your tester won't test the cable for shorts from just one end, use the ohmmeter to do so.  I'd make two "breakout jacks" by taking two RJ-45 jacks and attaching 4 loose pairs of wire to each one with the unconnected ends stripped.  (That is, one set of 4 pairs to one jack and another set of 4 pairs to the other jack.)  With these jacks you can test for shorts and for proper continuity from end to end.

Did you strip any of the individual wires when assembling the cable?

Lastly, given the very low cost of high-quality patch cables, I try to avoid ever making them unless absolutely necessary.
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cameljoe121Author Commented:
I feel like an idiot.... The cable was mislabeled the cable I was testing was plugged into the switch that is the reason it was showing a short across all pairs.
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Paul MacDonaldDirector, Information SystemsCommented:
Been there, done that.

Thanks for the points!
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