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External Loopback Network test

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Hello everyone!

I would like to know if somebody knows how to use an external network loopback adapter for test. It comes in form of a key ring- one side is Rj-12 male and the other side is Rj-45 female. I have search through different search engines and even asked the company who sold it to me to no availed.

I do some computer and network repairs since I retired. Even have some certifications under my belt. But nobody happens to have the answer to that one. Well if somebody has the answer to that I will be greatly appreciated. Thanks :) :)
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I have had some years as a Network Admin and I have never heard of that before :)
I know of loopback addresses for testing, but that sounds like its a terminator of some sort. The closest thing I have seen for something like that is you put it on the end of a network run, then ping an address. The unit will turn the signal around and reply to the originating PC. That way you know if they network run is good.

Im shooting on sound here and stumblin in the dark. But I had two cents in my pocket and figured I would throw them in the ring. Great question though :)
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