Turning on "Full Duplex" makes pc think theres no cable plugged in

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Matti_Mann

Reputable
Dec 17, 2015
5
0
4,510
Turning on "Full Duplex" makes pc think theres no cable plugged in.
dont know why
been having this issue for almost 2 years changed my isp yesterday and it dosent work still.
My connection is 500 mbps on everything else
 
Solution
jsmithepa
This is an negotiation error. Is a relatively easy issue, because is involves your PC and whatever that is IMMEDIATELY hook up to and nobody else, so:

PC ----(ethernet cable/in-wall cable?)----Switch.

Suspect bad cable/bad in-wall wirings. Can verify running a long extension CAT cable on the floor.

Then after that bad LAN driver on PC. Can verify this by plug in HERE exactly same cable, same switch ANOTHER PC/laptop etc.

Very rare switch would have problem, but it doesn't take any effort to plug in another switch port.
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jsmithepa

jsmithepa

Polypheme
Jun 14, 2014
13,096
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60,840
This is an negotiation error. Is a relatively easy issue, because is involves your PC and whatever that is IMMEDIATELY hook up to and nobody else, so:

PC ----(ethernet cable/in-wall cable?)----Switch.

Suspect bad cable/bad in-wall wirings. Can verify running a long extension CAT cable on the floor.

Then after that bad LAN driver on PC. Can verify this by plug in HERE exactly same cable, same switch ANOTHER PC/laptop etc.

Very rare switch would have problem, but it doesn't take any effort to plug in another switch port.
 
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Solution
M

Matti_Mann

Reputable
Dec 17, 2015
5
0
4,510
Yes the cable seems to be the issue, tested the cable that was in my main pc with my laptop and it was limited to 100mbps.
Then i testet another shorter cable that had full 1gb.
going to pull a new cable through the wall and hopefully that will resolve it.
Thank you :)
 
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kanewolf

kanewolf

Titan
Moderator
May 29, 2013
37,312
3,275
156,790
Before pulling a new cable through the wall (which may or may not be possible), you should re-terminate any keystone jacks (wall plates) and verify the jumpers (if any) on both ends are good. If you don't have any wall plates, then re-terminate the RJ45 on each end of the long cable. You might still have a problem, but re-terminating will be easier than pulling a new cable.
 
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