Gigabit Red

[pepusa]

Good evening to all, it is my first Post and I am resorting to this medium to see if anyone can give me a hand.

I have a network in my house that is composed of:

NAS unit, Gigabit
PC, with Gigabit network card
TP-Link TL-SG1008D Switch - Gigabit
Category 6 Network Cables.
Internet provider's modem

The problem is that when I connect everything to the switch (which is connected to the modem to receive internet, the PC does not recognize the gigabit speed. When I modify the speed in the network card configuration and select the AUTO-Negotiation option, it shows as if the network cable were disconnected and the same thing happens when I select the 1000 mbps speed. It only allows me to select the speed of 10 or 100 mbps.

Is there anyone who has already gone through this problem and can help me?

Thank you very much in advance!

Slds!

[Fassou]

Check the pairs or change the cable.

Salu2!

[kelven]

The network cables must be category 6.

[pepusa]

I tried changing the cables and it works the same. They are category 6. Thanks for the responses.

[Fassou]

Test the NAS and the PC with a crossover cable, and with fixed IPs, to confirm that your PC supports Gigabit.

The first motherboards with Gigabit support (~ P965 / Core2Duo) had many problems.

Salu2!

[pepusa]

I also tried it and it connects perfectly with 1000mbps.

[Fassou]

I hope you have already tried everything separately to try to isolate the fault, and it is only the connection between the PC and switch that does not work. So it only remains to think that the cable to the PC suffers some significant interference on its way to the switch, such as electrical cables or similar.

Regards!

[pepusa]

Yes, I have already tried all possible combinations and ruled out the cable failure as well. I connected the PC directly to the NAS drive and set the speed to GB. Tomorrow they will replace the switch with a new one to rule out that the problem is there as well, so I will tell you tomorrow.

Thank you for all the tips!

[pepusa]

Well, I just finished testing with the new switch and it's still the same problem. Does anyone have any other suggestions to test?

Thanks again!

[cobito]

@pepusa:

Bueno, I just finished testing with the new switch and no, it still has the same problem. Does anyone have any other ideas to test?

Thanks again!

Fassou has already told you this. The problem must be caused by a source of noise near the problematic cable. Remove that source or wrap the cable with aluminum foil along its entire length, connecting the foil to the PC tower chassis.

[pepusa]

With the cables in the same place, I removed the switch and put the NAS and it works perfectly with GB, which makes me think that it is not a problem of noise sources either.

Thanks to everyone for the answers and the help.

Slds!

[cobito]

Not all devices are equally immune to interference. The way you described what you did, the problem is in the stretch between the switch and the PC. It could be a cable in bad condition, a source of noise or anything else, but that's where efforts should be focused.

I have a cable in bad condition that I'm too lazy to change and most of the devices I connect only negotiate at 10mbps. In contrast, my desktop works perfectly at 100 mbps. The cable is bad, but the desktop PC is more tolerant of the problem which doesn't mean the problem doesn't exist.

[pepusa]

Cobito, thanks again for the reply!

I have already replaced the cable I am currently using twice. I tried with a Cat. 5E and now I have another Cat.6, so I rule out a defect in the cable, because with all three I had the same problem.