How should I perform a loopback cable test for an ethernet port?

Rodion15 · Oct 27, 2013

I have a computer with an ethernet port that I suspect is broken. Device manager in Windows (tested with both Windows XP and Windows 8) says the device is working properly (device manager > Network adapter > Properties > general tab), but when I plug in an ethernet cable to connect to the router, it doesn't work, no internet, only an orange blinking light left of the ethernet plug. The cable and router are OK because I can successfuly connect with that same cable with my laptop. So I suspect the ethernet plug or somewhere inside it is broken. I've also unsuccessfuly tried to connect to my router by http://192.168.1.1

I've thought that the best way to make sure the plug is broken is to make a loopback ethernet plug (it seems easy) but I don't know how to use this plug, how to do the actual test. Where should I ping? What should I expect to receive back?.

bill001g · Oct 27, 2013

There really is no such thing as a ethernet loopback plug. This is actually used on data communication lines.

You have done the test that proves you have a issue with the ethernet port on the PC...ie you plug a different pc into the same cable and it works.

If you were to get lucky you may have just bent one of the wires inside the port, you can take a flashlight and look to see if all the wires look straight.

Pretty much after this you are stuck I suspect. Most modern equipment everything is part of the main board of the machine. The only thing you could hope to replace would be the physical port but you should be able to see any damage. More likely you have some damage in some chip which does not pay to even think about repairing.

I would get a new board that goes into a PCI slot or maybe a USB based ethernet device.

Rodion15 · Oct 28, 2013

bill001g :

There really is no such thing as a ethernet loopback plug. This is actually used on data communication lines.

You have done the test that proves you have a issue with the ethernet port on the PC...ie you plug a different pc into the same cable and it works.

If you were to get lucky you may have just bent one of the wires inside the port, you can take a flashlight and look to see if all the wires look straight.

Pretty much after this you are stuck I suspect. Most modern equipment everything is part of the main board of the machine. The only thing you could hope to replace would be the physical port but you should be able to see any damage. More likely you have some damage in some chip which does not pay to even think about repairing.

I would get a new board that goes into a PCI slot or maybe a USB based ethernet device.

Thanks for your answer. That was clarifying enough.

Justanarshhole · Aug 23, 2016

Rodion15 :

I know this post is 3 -4 years old, but they had loopback testers then. Check it out...http://www.cableorganizer.com/network-test-equipment/?gclid=CL3Sr-T61s4CFdU6gQod-zMMoQ&gcssku=IT-LOOP&ef_id=V7vzyAAAAVY-9Rg3:20160823065712:s

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How should I perform a loopback cable test for an ethernet port?

Rodion15

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Justanarshhole

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