Custom Made RJ45 cable

OldKitMan

OldKitMan

OldKitMan

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18 Apr 2020
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Hi, I need to make a RJ45 cable with the pins being (source -> dest) pin 2 -> pin6, pin 4 -> pin4 and pin5 -> pin5.

Assuming I get a decent crimping tool and rj45 connectors am I ok to cut the ends of an existing cat 6 network cable I've got and put new plugs on the end of it and leave the other 5 cables unterminated? It's important that pins 1, 2, 3 are null on the destination side.
 
well this is going remarkably badly, got a cable, put it in my tester, all 8 pins show lights to indicate a good connection, chopped the ends of, wired it as required and it's only showing a light on 2 of the pins, 2->6 and 5->5, not 4-4.

I've repeated it a few times with a few different cables, different RJ45 connectors and 2 different crimping tools to try and determine if it was a crimper issue. Every time - probably over 10 times, same issue, always pin 4-4 not working. Tried with Cat 6 and cat 5(e) and it's always the same. Anyone know any companies that make up custom rj45 cables?
 
Uspa5ejl.jpg

pins 2, 4 and 5
DxV3qeEl.jpg

pins 4,5,6

When I plug into my cable tested it shows a connection between 2->6 and 5->5 but not 4->4
 
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Just in case, have you checked the tester on another full cable? In case somehow the pin 4 tester went bust, even though it worked the first time.

EDIT: Another thing I noticed is where the plastic clip presses down into the cable, I usually flatten that bit a little so the wires inside don't get too crushed.
 
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Orcvader said:
Just in case, have you checked the tester on another full cable? In case somehow the pin 4 tester went bust, even though it worked the first time.
Click to expand...
yes, done that - works fine with a full cable. I'm guessing I'm not doing something quite right, can you over crimp a cable, not sure how much force I should really be using - may try again with less pressure applied.
 
OldKitMan said:
yes, done that - works fine with a full cable. I'm guessing I'm not doing something quite right, can you over crimp a cable, not sure how much force I should really be using - may try again with less pressure applied.
Click to expand...
Edited my post a little too late, but it looks like there could be too much pressure on the part where the plastic clip pushes down. Unwind the wires a little extra more and it should avoid that.

Depends on the connectors really, I had some cheap ones where my usual force was too much, but they never really lasted long anyway (cheap plastic, clip was prone to easily breaking) so swapped them with higher quality ones.
 
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