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Connecting a keystone to a CAT6 ethernet cable? Is there a problem with this setup?

Connecting a keystone to a CAT6 ethernet cable? Is there a problem with this setup?

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165
04-29-2026, 06:00 AM
#1
hi, i try to connect a keystone jack in my home wall to ethernet cat6 cable. i followed the internet instructions, but my electrical tester says there is a problem on pin 4. this same issue happens in two different rooms, so probably something is wrong with how I connected it. can someone please help me and tell me what connection is incorrect? here are photos showing how I connected it: keystone: https://ibb.co/hcJWm14 T568B RJ45 (the other side of connection): https://ibb.co/MhHdMPB https://ibb.co/kMrqbMZ T568B (https://cdn.cableorganizer.com/images/ar...t-568B.jpg ) tester result: https://ibb.co/mtJXw2J
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TechSoldierEx2
04-29-2026, 06:00 AM #1

hi, i try to connect a keystone jack in my home wall to ethernet cat6 cable. i followed the internet instructions, but my electrical tester says there is a problem on pin 4. this same issue happens in two different rooms, so probably something is wrong with how I connected it. can someone please help me and tell me what connection is incorrect? here are photos showing how I connected it: keystone: https://ibb.co/hcJWm14 T568B RJ45 (the other side of connection): https://ibb.co/MhHdMPB https://ibb.co/kMrqbMZ T568B (https://cdn.cableorganizer.com/images/ar...t-568B.jpg ) tester result: https://ibb.co/mtJXw2J

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Mettaton201
Junior Member
5
05-13-2026, 04:05 AM
#2
First of all, do they actually work at speeds like 100 Mbps, 1 Gbps, or even 10 Gbps? Honestly, that little device is junk. It just checks if wires are connected; it can't measure speed or anything else. Also, I don't trust those plastic RJ45 glass ends because they get broken easily. Have you ever tried using this tester on a known working cable to see what happens?
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Mettaton201
05-13-2026, 04:05 AM #2

First of all, do they actually work at speeds like 100 Mbps, 1 Gbps, or even 10 Gbps? Honestly, that little device is junk. It just checks if wires are connected; it can't measure speed or anything else. Also, I don't trust those plastic RJ45 glass ends because they get broken easily. Have you ever tried using this tester on a known working cable to see what happens?

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luisiiii1234
Member
146
05-18-2026, 08:48 AM
#3
In picture Cat6-s (the second image under RJ45): Is that a metal or shielded plug? Also, the wires coming in look messy and tangled. They need to be straightened and smoothed before you put them in. Plus, make sure the plugs match the wire type. There are different plugs for solid wires versus stranded ones.
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luisiiii1234
05-18-2026, 08:48 AM #3

In picture Cat6-s (the second image under RJ45): Is that a metal or shielded plug? Also, the wires coming in look messy and tangled. They need to be straightened and smoothed before you put them in. Plus, make sure the plugs match the wire type. There are different plugs for solid wires versus stranded ones.

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Me1MadMiner
Member
190
05-25-2026, 03:56 PM
#4
shielded cat6 connector passthrough. so you both suggest it's a problem in the RJ45 side? did I connect the colors of wiring well in keystone and rj45? because it's weird that the same problem (pin 4 off) happens in two rooms, it means something i connect wrong in the way of connection. i tried the tester on good cable and all wires are lit up.
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Me1MadMiner
05-25-2026, 03:56 PM #4

shielded cat6 connector passthrough. so you both suggest it's a problem in the RJ45 side? did I connect the colors of wiring well in keystone and rj45? because it's weird that the same problem (pin 4 off) happens in two rooms, it means something i connect wrong in the way of connection. i tried the tester on good cable and all wires are lit up.

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CerberusVic
Junior Member
40
05-25-2026, 06:32 PM
#5
Your colors are fine. Even if you messed up, as long as your mistakes match each other, that cheap tester won't catch it. It can't tell the color of the wires and it can't even spot a split in a pair. Why would two people do the exact same thing? Maybe your RJ45 crimp tool is bad. Are you sure pin 4 is all the way stuck into the wire on the plug side? Although I rarely use that dirty trick to strip off a tiny bit of wire before cutting it. You can then check a multimeter if the pins in the plug are actually connecting. Most times, the excess wires were cut away long before you found any problems anyway. It could also be pin 4 on the Keystone. This is the easier fix. Just pull the blue wire out, cut a little bit off it, and re-punch it. Sometimes that special punch-down tool does a better job sometimes. But sometimes a regular punch-down tool can't get the wire all the way in.
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CerberusVic
05-25-2026, 06:32 PM #5

Your colors are fine. Even if you messed up, as long as your mistakes match each other, that cheap tester won't catch it. It can't tell the color of the wires and it can't even spot a split in a pair. Why would two people do the exact same thing? Maybe your RJ45 crimp tool is bad. Are you sure pin 4 is all the way stuck into the wire on the plug side? Although I rarely use that dirty trick to strip off a tiny bit of wire before cutting it. You can then check a multimeter if the pins in the plug are actually connecting. Most times, the excess wires were cut away long before you found any problems anyway. It could also be pin 4 on the Keystone. This is the easier fix. Just pull the blue wire out, cut a little bit off it, and re-punch it. Sometimes that special punch-down tool does a better job sometimes. But sometimes a regular punch-down tool can't get the wire all the way in.

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AnnaLovesCake
Member
72
05-27-2026, 07:17 PM
#6
On the keystone: what tool did you use to push the wires into place? The gap between the teeth isn't even, and it looks like that area was pressed many times. That thick blue wire seems to have sliced through the insulation. All eight wires are loose or not twisted for a few inches past the keystone. They shouldn't be more than half an inch untwisted there. Maybe two rooms having this is just luck. There will probably be some other thoughts and suggestions coming up. The fix might just be to redo it with better tools so the connections stay cleaner and stronger.
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AnnaLovesCake
05-27-2026, 07:17 PM #6

On the keystone: what tool did you use to push the wires into place? The gap between the teeth isn't even, and it looks like that area was pressed many times. That thick blue wire seems to have sliced through the insulation. All eight wires are loose or not twisted for a few inches past the keystone. They shouldn't be more than half an inch untwisted there. Maybe two rooms having this is just luck. There will probably be some other thoughts and suggestions coming up. The fix might just be to redo it with better tools so the connections stay cleaner and stronger.

P
PGVortex
Member
146
05-28-2026, 12:45 AM
#7
Thanks to everyone for their replies and help. If I need to check in on things later or see any good news, please let me know.
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PGVortex
05-28-2026, 12:45 AM #7

Thanks to everyone for their replies and help. If I need to check in on things later or see any good news, please let me know.