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Windows 7: Local Area Connection Network Cable Unplugged

29 Aug 2012   #1
chiner44

Windows 7 Home Premium 64 bit
 
 
Local Area Connection Network Cable Unplugged

I know there are many threads about this issue. There have been no answers that have been helpful.

OS: Running Windows 7 Home Premium 64 bit on Laptop and PC (custom build).
Router: ASUS RT-N56U
Switch: D Link DES 1008e
Network Adapter PC: Realtek PCIe GBE Family Controller
Network Adapter Laptop: Realtek PCIe FE Family Controller


When either is plugged directly into the router, no ethernet cable is detected. If you run either the PC or laptop through the switch first, it works just fine.

I have uninstalled and re-installed network drivers, I've unistalled and deleted the adapters and software and started from scratch. I've checked all of the setting 3 times over. I just can't seem to figure it out.

Am I missing something very simple here?


My System SpecsSystem Spec
.
29 Aug 2012   #2
Ztruker

Windows 10 Pro X64
 
 

When you plug directly into the router, did you then power cycle the router and computer?
My System SpecsSystem Spec
29 Aug 2012   #3
chiner44

Windows 7 Home Premium 64 bit
 
 

Yes, I've cycled all three multiple times.
My System SpecsSystem Spec
.

29 Aug 2012   #4
edwar

7 x64
 
 

Try every port on the router. Could be you have a bad port. Is the PC Ethernet cards set to Auto negotiate link speed?
My System SpecsSystem Spec
29 Aug 2012   #5
chiner44

Windows 7 Home Premium 64 bit
 
 

I have played around a little more and found things that work and things that don't. Here is what I have found so far:

Here's the setup that DOESN'T work:

Modem > Router (ASUS RT-N56U) > CAT5 Connection Into The House > PC or Laptop with Windows Home Premium 7 64 Bit
*I get this error: Local Area Connection Network Cable Unplugged

Here's what DOES work:

Modem > Router ( ASUS RT-N56U) > Switch (D Link DES 1008e) > CAT5 Connection Into The House > PC
*The switch allows access

Here's what DOES work:

Modem > Router ( ASUS RT-N56U) > Directly connected to Laptop or PC
*A direct connection works fine

I've checked the CAT5 runs and they are good, no nails or cuts in the line. I've checked the ends and they are good. I've read a little about crossover cables but this router states it has auto crossover function (MDI-X). I'm not really sure what else there is to look for. It's working fine now with the switch but I would like to figure out why I can't make the direct connection through my wall plates in the house.
My System SpecsSystem Spec
30 Aug 2012   #6
edwar

7 x64
 
 

Then it is the wiring. Something in the wiring is wrong, not allowing the Gigabit Ethernet connection but does allow 100Mbs connection the switch is using. Throwing in that 100Mbs switch drops all connections to the 100Mbs limit which the wiring can handle. Could be you have one wire backwards on one of the RJ45 plugs.

How are you testing the cabling? If you are using an older standard 100Mbs tester it only tests for the set of wires, plug connectors/terminals, used for 100Mbs speeds.
My System SpecsSystem Spec
30 Aug 2012   #7
chiner44

Windows 7 Home Premium 64 bit
 
 

What tester/test would you recommend for finding this wiring problem?

Here's what I found:

RJ45 at the router has T568A wiring setup - The wall connector in question has T568A wiring setup

Is that correct?
My System SpecsSystem Spec
28 Nov 2015   #8
ohbilly

Windows 7 64bit
 
 
Local area connection cable unplugged (possible solution)

So yesterday i talked to comcast/xfinity for 5 hours trying to figure out why my PCIe Fe family controller kept disconnecting, ended up talking to an advanced team from there Tech support (very nice guy tbh) he said its possible that my nic card is going bad and that windows 10 is having this issue alot, seeing how i did not want to purchase another card (poorbie atm lol) so i went to see if there was a driver update and it was the most recent, still kept doing it so im like huh maybe this driver update is the problem.... SURE enough rolled back to previous version and im 2 hours free of that cable unplugged issue!!!! I believe the MOST recent update to the driver is bad for older PCIe Fe family controller nic cards (RealTek) so if u have issues with it now try and rollback the diver update as it worked for me.. also my pc is from 2010 if anyone wanted to know!
My System SpecsSystem Spec
28 Nov 2015   #9
edwar

7 x64
 
 

Here's a simple rule of thumb I live by. If it Ain't broke stop trying to fix it. If your network card is working and giving you the rated Mbs it is supposed to work at why update the drive. It Ain't broke.
My System SpecsSystem Spec
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 Local Area Connection Network Cable Unplugged




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