CAT5e Cable not working on one computer but working on another

[Surajsharma]

BACKGROUND:

So I have 2 computers in my home both are desktop PCs. The old computer have 100 Mbit Ethernet port whereas the new computer have a Gigabit port

PROBLEM:

I am connecting my new PC to a Router via CAT 5e 30 Meter Cable it frequently goes into "detecting and not detecting", give errors as "Network cable unplugged" and "Identifying" but when I connect the same 30 Meter Cable to my old PC it is detecting and Internet is working fine.

To solve this issue on my new PC:

I replaced the 30 meter CAT 5e Cable with another 20 Meter CAT5e Cable and the Internet is working fine on my new machine even on old machine the 20 Meter Cable will work

The real question?

I don't understand that why that 30 Meter Cable will work only on my old computer but not on my new computer.

Some technical details:

1) All Cables are CAT5e Straight Through Cables with 568B Connectors

2) My Router is TP Link WLR840N

3) Router is DHCP ENABLED

4) The LAN LED on Router is showing "ON"

5) My old PC is running Windows 10 and my new PC is also running same Windows 10, all drivers are up to date on both the computers.

Things that I haven't done:

I haven't done a continuity test or Cable Test using LAN tester because I don't have it neither have the multi-meter

Reason why I am doing this:

Now due to home renovation I have to place the router somewhere else and that 20 meter cable is falling short enough so I want to utilize my 30 Meter CAT5e Cable but that 30 Meter Cable isn't working on my new PC.

Notes:

Here is the video that I made on the issue I am facing

https://drive.google.com/open?id=0B8Bk4FyQkBHKWmwwb2RSZ19LRFU

 

[corroded]

personally, I toss suspect cables, not worth the hassle.

Other than that I'd reset the NIC on the new machine to see if that fixes it. (Uninstall the NIC from the Device Manager but do not delete the driver) and reboot, the system will reload it. Test again.

The old machine, using Fast Ethernet, only uses 2 pair of the 4 may be the issue. The new machine is likely attempting to use Gigabit and is failing and not dropping back to the slower connection.

I still say it is the cable...

 

[atljsf]

a 30 meter cable can be damaged, wires broken or bent, the connectors itself could be not properly done, the problem with the connectors is the most common problem

sometimes people decides to do b standard, sometimes a standard or is a direct cable, with one switch this could be a problem but with other it could go undetected, it happens alot with hp switches, they don't like the standard mixture

 

[BFG-9000]

Yep, cable itself is probably OK, at least for wires 1, 2, 3, 6 as those are all that's needed for 10/100. Look very carefully at the connector at the computer end (presumably it works on the router end) with a magnifying glass--there could be some plastic swarf or other reason preventing good contact with that jack at least on those 4 pins. Or it could be the jack on the computer itself just not liking the fit of that connector (you can often see this if it connects fine when you are applying pressure in one direction but it fails when you let go) so also try reversing the cable.

If it still doesn't work and you are able to, put new ends on the 30M cable yourself. If not, the cheapest option is to buy another cable.

 

[Surajsharma]

personally, I toss suspect cables, not worth the hassle.

Other than that I'd reset the NIC on the new machine to see if that fixes it. (Uninstall the NIC from the Device Manager but do not delete the driver) and reboot, the system will reload it. Test again.

The old machine, using Fast Ethernet, only uses 2 pair of the 4 may be the issue. The new machine is likely attempting to use Gigabit and is failing and not dropping back to the slower connection.

I still say it is the cable...

That's the reason I forced "Full Duplex 100 Mbps" via Advanced option in Network Configuration option but still the same problem as mentioned in the video that I have posted link here

 

[Surajsharma]

a 30 meter cable can be damaged, wires broken or bent, the connectors itself could be not properly done, the problem with the connectors is the most common problem

sometimes people decides to do b standard, sometimes a standard or is a direct cable, with one switch this could be a problem but with other it could go undetected, it happens alot with hp switches, they don't like the standard mixture

The cable is new, manufactured by D-Link as written on Cable, one thing I noticed the twisted pair cables are bit thick than other cables that I have compared with. As far as connectors are concerned I have re-done the connectors in order to ensure that previous crimping wasn't bad

 

[Surajsharma]

Yep, cable itself is probably OK, at least for wires 1, 2, 3, 6 as those are all that's needed for 10/100. Look very carefully at the connector at the computer end (presumably it works on the router end) with a magnifying glass--there could be some plastic swarf or other reason preventing good contact with that jack at least on those 4 pins. Or it could be the jack on the computer itself just not liking the fit of that connector (you can often see this if it connects fine when you are applying pressure in one direction but it fails when you let go) so also try reversing the cable.

If it still doesn't work and you are able to, put new ends on the 30M cable yourself. If not, the cheapest option is to buy another cable.

The connector on both ends fits perfectly on Router as well as on PC, if I put the same cable on my old PC, it will work whereas if connect it with my new PC the problem comes back, Can it be a power issue that cable might not be able to carry signal that far, what do you think, my friend have same configuration but he use a switch and his router is different a CISCO Router as far as I remember

 

[BFG-9000]

New cables can be bad. You can't just recrimp connectors and expect it will help, you have to cut them off and replace them with new ones, preferably made by a different company to rule out compatibility problems. Unless the cable runs through walls it is, as has been recommended repeatedly, easiest just to change the cable for a new one. After all your 20M cable works perfectly so it's not unreasonable to expect a different 30M cable should work too.

It's not the fit of the connector in the jack, it's that every wire must make contact to work. So you have to be looking at each wire in the bottom of the jack.

Cat5E is rated for a full 100M or 330 feet at gigabit speeds so any wire losses are already expected in the spec. Many people have been able to go well out of spec to 500-600 feet and it still works fine, but YMMV.