Network tone generator freezes when connected to one particular ethernet port?

Network tone generator freezes when plugged into a particular ethernet port.

I use a Trendnet tone generator like below:

http://www.trendnet.com/products/proddetail?prod=110_tc-nt2

It generally works extremely well. But yesterday I plugged it into an ethernet port and the LED lights on it appeared to have faded. I plugged it back out again and immediately all the LED lights illuminated again.  Obviously, I could not complete the network probe test because in this state it was obviously not emitting a "tone". What happened here? I've never seen it do this before.

(BTW, Looking at the front of this device it says "not to be used on live circuits")
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furunoAsked:
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JohnBusiness Consultant (Owner)Commented:
Are you using the upgraded device?  One on the two shown has been discontinued.

Verifies cable continuity, opens, shorts, and miswires   <-- It would have difficulty doing this in a powered circuit. Is the port a POE port?   That would be in line with the warning on the front of the device.
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furunoAuthor Commented:
John, there is no evidence of a PoE injector on the network.

BTW, using NT2 version
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JohnBusiness Consultant (Owner)Commented:
Interesting. Ports that are plain should all work the same way. I will do some looking
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Andy BartkiewiczNetwork AnalystCommented:
Sounds like the port had an active data or phone connection. Most toners will not work on those, but it usually tells you why its not working
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kenfcampCommented:
Are you testing from the device port or switch / patch panel?
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kenfcampCommented:
The NT2 isn't a tone generator it's a cable continuity tester.. There's a difference

You should be using a tone generator with wand to trace the connection points, unplug from both ends then test the cable with your NT2

Personally I'd recommend AT8LK (at a minimum) it also has the ability to flash switch ports making identification a little easier
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furunoAuthor Commented:
I'm testing form the ethernet port


The NT2 came bundled with a "wand" which is the receiving end. The two devices work in conjunction with each other.
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