Loss of network speed and quality at 30m

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HeisenbergCA

HeisenbergCA

Honorable
Feb 2, 2014
10
0
10,510
I have an networking issue that I can't figure out.

I have a 50mbps internet connection (50mbps down, 5mbps up). There is a Gigabit switch in front of the ISP modem in the basement. I have a computer connected right next to the Gigabit switch in the basement, that computer is able to connect to the switch at 1gbps and speedtest.net shows that I can pull 47-ish mbps down and push 5-ish mbps up.

Issue # 1: I have a second computer upstairs that is connected to the same Gigabit switch (via a wall-jack) but no matter what computer or NIC I connect to it, I only get 100mbps connection. The NIC isn't able to auto-negotiate a 1gbps connection.

Issue # 2: When I run speedtest.net on the computer upstairs, I only get 20-ish mbps down and 5-ish mbps up.

I've tried plugging in three different computers upstairs (each with a gigabit NIC) and they all can auto-negotiate to 100mbps only. One of them auto-negotiated to 10mbps, but after messing around with the NIC's properties I managed to get it to connect at 100mbps. I've tried forcing a 1gbps connection via the NIC properties, but that didn't work (it gave me 10 mbps instead).

I've also tried plugging cable for the computer upstairs in different ports on the Gigabit switch, that didn't help either.

I have also confirmed that the network cable used from the switch to the wall jack and from there to my workstation is cat5e, so it "should" support 1gbps.

Does anyone know how I can resolve these issues?
 
Solution
B
That is good cable.

There really is no easy way to check the wires. You can try battery and led trick but it is a pain in the butt to test.

First just check the colors and see if they match the diagrams on the internet for t568a or 568b on both ends
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HeisenbergCA

HeisenbergCA

Honorable
Feb 2, 2014
10
0
10,510
The wiring for the room upstairs was put in last year, not sure if that would be considered old.

Is there a way to check if it's the wiring that's causing the issue? The cable has some frequencies listed on it, would that be an indicator?
 
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bill001g

Titan
Aug 9, 2012
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You really can really only check wiring with a device called a TDR meter ..most people call these fluke because they are the major manufacture.

Still that would only really be needed if the wire itself was suspect. The most common reasons for strange issue like yours are the jacks are not actually wired to the correct standards...it does not take much just mixing up the pairs and it will partially work but not well. The other common thing is the wire is just not making good contact. This is why most installers test every jack since you can't tell by looking. You can just pull it lose cut off a inch or so and repunch the wire into the connection on the jack...or replace the RJ45 end if it is done that way.

You can hope they did not install the wrong cable...it does tell on the side but it would be very rare with newer cable to get anything less than cat-5e. If you have a very long run and they used copper coated aluminum cable rather than pure copper it could be that...you hope not because your only option is to replace it with the proper cable.
 
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HeisenbergCA

HeisenbergCA

Honorable
Feb 2, 2014
10
0
10,510
It's running along the side of the basement/house, so it would be 40ft long in distance, and then a few more feet of cable is rolled up.

Is there a way to use the NIC to check if it is receiving power in all 4 pairs?
 
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bill001g

Titan
Aug 9, 2012
28,367
2,766
125,640
That is good cable.

There really is no easy way to check the wires. You can try battery and led trick but it is a pain in the butt to test.

First just check the colors and see if they match the diagrams on the internet for t568a or 568b on both ends
 
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Solution
HeisenbergCA

HeisenbergCA

Honorable
Feb 2, 2014
10
0
10,510
bill001g, you were correct. I opened the wall jack and found that 2 of the 4 pairs were not connected. I didn't have the correct tool for the job but a flat head screw driver did the trick. I now have 1gbps speed on both computers!

Thanks a lot!
 
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