Has anyone tried to build a Verifier for RJ45? or is it possible?

samsn4

?

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Daniel Mueth

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"Just plug it in and let's see what happens"

CounterRotatingProps

Daniel -

if you mean a cable checker, then a stamp or just some simple discrete logic could do it - piece of cake.
or do you mean data-stream validation running at full bore?

please be more specific, thanks

- Howard

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DogP

Yeah, I built one w/ an LED and battery, but it was just something quick I hacked together to make sure a cable was (likely) wired correctly... it didn't test the quality of the link or anything. What are you wanting?

DogP

Forrest

I found them available online for $6.95. It will cost you more to build one.

Toby Seckshund

A plug or socket wired so that one pair is shorted at the far end, for the four pairs, will allow all the wires to be daisy-chained so that at one end a battery and a LED would show all were conducting, BUT ...

It wouldn't show if the pairs were shorted anyway, it wouldn't show if the wires in a pair were swapped over and you would have to watch for C/O leads.

I supose you could put a batch of known resistances, high enough to mask out the wires resistance, and with careful choice of values the faulty pair could be identified.

ie 1K between the wires of one pair, 2K btwo the next pair, 4K ......

Then at one end you would expect 1K+2K+4K+8K = 15K. (I haven't got my brain rounf what a C/O lead would give, but a Un C/O converter lead could be made up)

But as stated little testers are available and would have housings etc for the toolbox survival.

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Style and grace : Nil point

hinv

Or you could send a different frequency square wave down each one and measure them when they come back. That way, you can detect which wire should go where.
You should use some drive limiting resisters in case you run into a dead short between wires. That way you won't heat up your prop.

You could use just spin to send out the square waves (just increment a range of 8 I/O pins) You could use counters to detect the frequency of each received. Check out:
http://www.parallax.com/go/counters

Or, if you wanted it real quick and dirty, you could just connect the far end to some LEDs and just watch it count in binary. Of course, you would have to use a low enough frequency to actually see them blink.

No if you want to test the quality (capacitance & length) of an RJ45, then I would look to Phi Pi for suggestions as he has a real good handle on signal issues.

Doug

Post Edited (hinv) : 8/30/2009 4:39:03 PM GMT

samsn4

I'm looking to send data to see if connection at the plug is good enough. I have a paladin tester but all it tells me is if their is continuity and it has a tone trace. I was want some thing that could test for 10baseT and 100baseT, speed.

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Daniel Mueth

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

"Just plug it in and let's see what happens"

Toby Seckshund

I was wondering if a Ybox2 could be used to send data to itself, but I bet its IP would prevent it. Perhaps there is sufficient grunt left ovet within the Prop to run two versions together. This would require a way to test the usuall 2 pairs and the other two pairs separately (switched plug/socket)

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Style and grace : Nil point