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Forum Index : Electronics : Cheap UTP Cable tester

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Dylan
Regular Member

Joined: 17/06/2013
Location: Netherlands
Posts: 81
Posted: 08:06am 06 Jul 2013
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My first visit to an electronics shop ... in over twenty years.

I needed some components, and rather than wait for them to arrive from China, I finally got round to visiting the local electronics shop. A feast for the eyes, and with the exception of finding an ISO car radio connector only to be told it was the part I already have (it came in my car!) and not the part I need (the radio side, my radio has a molex instead), I found most of what I wanted (to know).

Anyway, in a bargain bin for a euro I found a wall box with two RJ45 socket - or so I took them to be. On partial disassembly it quickly turned out that having 16 output holes, there was no difference in sides (not any real surprise considering the screws are numbered 1 to 8) using a multimeter continuity test, so I further disassembled and from the very simple circuit board the two sockets share the same pins.

A quick google of "rj45 1a 2a 1b 2b s" confirmed my fears that this is probably a bastardised RJ14 (perhaps for an office where two people share the same phone line, but at least have individual phones on their desks). But all is not lost....

It just so happens that for the purpose I need (testing that I made a CAT5 ethernet cable correctly) only lines 1-3 and 6 are needed. Even more coincidentally, I bought a desoldering pump (with heater) on the same visit. And I have a knife. Not fit for crocodiles, but for traces it will do.

So, to anybody who has found it interesting enough to get this far, what next? Desolder the jacks? Or reroute one jack to 4578, so that I can use the screw interface? Or just use it as a female-female RJ45 adapter?(http://www.amazon.com/Belkin-R6D011-Female-Inline-C oupler/dp/B00006HTTE 7 times more expensive)
 
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