Question Ethernet Cable Disconnection

Nov 3, 2019
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Hey, recently ran a new Ethernet cable from from of workshop to the back (easily 40-50 meters), ive used a cat 6 cable with fj45 connectors.
From there its plugged into an internet switch.
Which diverts to my room, Basically i can use the internet perfectly for a time before it randomly stops working. I can unplug and plug it in again on either end and itll start working again before the same issue happens.
The first time i unplugged it from the modem and it worked. The second time that did nothing so i did it at the switch and it worked again. The internet will last an hour or two before stopping and saying theres no cable connected.
 
Nov 3, 2019
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The length is OK for a regular Cat 6 copper cable at 10/100/1000 ethernet/fast_ethernet/gigabyte_ethernet speeds.

First thing I'd do would be to plug the cable into another port on the switch. Ports on switches can deteriorate. I'd also shut the switch off and turn it back on to reinitialize the switch.

Next, I'd look at each end to see if the ends are plugged in fully to the switch on one side with a green light for the port showing and on the other end a green light showing on the back of the network card on the computer.

It's also a good idea at this point to check the cable run to see that some portion of the cable is not lying across fluorescent lights or on or near anything that can cause electrical magnetic interference (EMI) such as a power transformer.

If the lights are green on both ends and the cable is not lying on or near anything EMI that can scramble data or cause connection drops, then I would test the cable with a network cable RJ45 tester.

See, the light on each end can be green for awhile and then change. So to be sure, you test the cable. This will test to see if all eight wires in the cable are working and if the cable is attached to the RJ45 connector properly. Amazon sells this one cheap for about $10.00:

View: https://youtu.be/3tHvOLBp2zM


If the cable checks out, then something else is happening and at that point you normally start taking a closer look at the switch (which you should already have turned off then back on after plugging the cable into a different port on the switch), the network card, and the configuration settings. However, VERY often in your situation the cable does NOT check out.
I appreciate the fast response, ive checked the cable and its not laying on anything that can cause issues i believe, i made sure even when i ran it. I switched ports as well, but that does nothing as it wont connect now. The switch and cable is brand new, the lights on switch are all green but the cabled side plugged into the modem will now not light up at all.

Ill buy the tester to test the cables, does that mean theres a kink causing it to stop working or could it just be the connections of the RJ45 heads? if so what can i do to fix them? Can post photos if need be, cheers appreciate the help
 
Be sure the cable is not a fake ethernet cable. Ethernet cable must be pure copper (no cca) and must have wire size 22-24. None of that flat or thin cable. Since this fake cable is not actually certified it is hard to predict how well it will work. It has massive issues the longer the cable is
 
Nov 3, 2019
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Also, I just caught this. You said "the cabled side plugged into the modem." By modem, do you mean the back of the computer? Or, do you mean you have some kind of a ethernet modem next to your computer far from the switch? I'm confused by this statement.

Normally, one end of the cable plugs into a switch or router or modem and the other end plugs into your computer.

But you posted that one end of the cable is plugged into the switch and the other end into a modem. Was that a typo?

Can you draw a diagram of your network?
View: https://imgur.com/a/GUkxvCV
diagram attached here along with photos of the ports of the switch

So basically on the switch only the two ports that are plugged in are lit, while on the modem where it originates is not lit.

basically ive been testing it with my ps4 which is only 4 weeks old which says no lan cable is connected, while my pc doesnt detect it.
 
Nov 3, 2019
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Be sure the cable is not a fake ethernet cable. Ethernet cable must be pure copper (no cca) and must have wire size 22-24. None of that flat or thin cable. Since this fake cable is not actually certified it is hard to predict how well it will work. It has massive issues the longer the cable is
I dont think its fake, bought it from bunnings a massive company and its quite thick
 
Nov 3, 2019
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Thank you AAAii, that diagram cleared everything up! I see you have the switch connected to the modem and your PC connected to the switch. That's exactly how it should be.

But you are saying that the end of the long cable, which is plugged into the modem, is not triggering the port light on the modem to light up.

Yet, the PS4 works off the short cable connected to the switch while the PC does not work off the same short cable connected to the switch. Is this correct?

Also, is it possible to upload a picture of the modem (which should be powered on) showing the side the long cable plugs into while the long cable is plugged into the modem?

And carefully do the cable test and do the testing more than once to be sure. Refer to my previous post with the video if needed. It's important to follow the cable tester instructions and check each wire carefully. And to do it multiple times. If even one wire is faulty, we need to know that. Let us know the testing results.
View: https://imgur.com/a/GUkxvCV?


New photos attached, basically the long cable is not lit on the modem side, and the short cable does not light up on the pc side although they both light up in the switch. Sorry for being a little unclear. neither the ps4 or pc work as they are both unable to detect the ethernet cable. Ill buy the tester today after work and get it checked out!
thanks once again
 
Nov 3, 2019
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View: https://imgur.com/a/GUkxvCV?


New photos attached, basically the long cable is not lit on the modem side, and the short cable does not light up on the pc side although they both light up in the switch. Sorry for being a little unclear. neither the ps4 or pc work as they are both unable to detect the ethernet cable. Ill buy the tester today after work and get it checked out!
thanks once again
if you need any more photos just let me know! thanks!
 
Nov 3, 2019
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Look at the picture, no green light on LAN 1. It should be green. You'll have no network or Internet access from your computer and PS4 until the problem is identified and resolved and the LAN 1 green light comes on with the long cable plugged into it.

To recap, you have already tried plugging that end of the long cable into another one of the LAN ports on the modem and the green light did not come on though the other end of the long cable is plugged into the switch and that port light is green.

Of course, let me know when the cable has been correctly tested and what the testing results are. If one or more wires do not test out, the cable is the problem.

---> But in the meanwhile please, if you can, plug the cable in LAN 2 (where the green light is on) into the LAN 1 port to see if the LAN 1 green light comes on. You can then plug that cable right back into the LAN 2 port where you got it from when you're finished.

Let me know if the LAN 1 port light comes on when you plug the cable that's in the LAN 2 port into the LAN 1 port temporarily to check that.



P.S. Don't worry about the green light on the computer network card not coming on, now that we know the long cable is not working with the modem it should be off at this point. That's normal.
View: https://imgur.com/a/GUkxvCV?


New photos attached, basically the long cable is not lit on the modem side, and the short cable does not light up on the pc side although they both light up in the switch. Sorry for being a little unclear. neither the ps4 or pc work as they are both unable to detect the ethernet cable. Ill buy the tester today after work and get it checked out!
thanks once again
if you need any more photos just let me know!

Just tested the cable out wire 3 gets skipped on the network tester, meaning I damaged the cable with a kink when i ran it unfortunately thanks for the help, looks like im going to have to run a new cable
 
Nov 3, 2019
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BINGO! The long cable is bad and needs to be replaced. Good job working through it to the end and glad I could help. Thanks for letting us know.
Basically ran a new wire today and tested both cables, both fully functional, i played for an hour but then disconnected? and cant detect it anymore and neither will my pc lan port light up. i tested the short cable at the switch side with just the big tester while the other side was plugged into the ps4. Im unsure why its not detecting anymore. The long cable is lit on both ends and tested perfectly. Both ps4 and pc cant detect is there any reason why?
 
Reactions: LWFG001
Nov 3, 2019
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I appreciate the help once again, so basically ive discovered the source of the problem (sort of) the modem side where the long cable is plugged in is no longer lit. All though both cables are testing perfectly. Could it possibly be bad crimping? ive changed the port it was plugged into though there was no change. I believe thats why the short cable is no longer being detected. Sorry for the back and forth!
 
Nov 3, 2019
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If the cable tests perfectly, it's not the cable in my experience. First, I usually power off and then power on the modem to see if the connection is restored. Modems take a few minutes to come up so be patient. If it's fixed, great. If not, I call the Internet service provider who gave me the modem and ask them to perform tests to the modem to check it and see if it's working correctly.
Alright that makes sense, thanks once again ill see what i can do!
 

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