Netgear says open cable but it is plugged in and usable

[GraySenshi]

I went and did the cable tester and it said port 11 was a open with a falt distance of 5 (meters). the cable was only 4ft and if it was open. why is in plunged into the computer and I have Internet and everything.

Btw no wifi double checked

 

[little_me]

IP port numbers (in your case, 11) have nothing to do with cable testers.
If said port number refers to port on router, it must be special since most routers have only 1 WAN port and 4 LAN (not 11)
The fault distance might not be between you and router but between router and the wall socket/modem however you have it set up.

That said, the cable might be faulty and... router might be using only 2 pairs of it (10/100Mbit speed aka cat5) instead of all 4.
This is why it might work even if one or two pairs might be open (no connection) EDIT: it is also possible that other end doesn't even have said pins connected even if they exist due to RJ45 standard being 8 pins. This might end up being seen as "open" and could happen in older toys that do only 10/100 speeds.
distance difference is odd though, 5 meters against 4 ft (around 1.2 meters) pretty much means that the measured cable and cable you are speaking of are not same.

 

[GraySenshi]

I thought I said something but it's a switch not a router. I tested the ports and the cables on other computers. It all checks out. when I plug anything into the one desktop tho. it will say open line but will still connect to computers on the network and also can receive Internet. To make sure it wasn't using wireless I completely disabled it

 

[little_me]

If the situation persist even with different cable and different port on the switch, then the problem is on computers end.
As I noted, some older network cards might not have all pairs connected and they would still work at 10/100 speeds.

However, since it works.. ultimately it doesn't really matter more than "I was just curious as to why"

 

[GraySenshi]

All my tests says it's on the computer side. but if the router says it's not connected then why is it working, it's odd. and I am assuming the port is faulty but I was curious on why the one says no and it still works.

 

[little_me]

As I said, only 2 pairs of the 4 are in use if speed is 10 or 100Mbit
other two pairs? not in use, they could be broken/cut/open and cable would still work at that speed.
In this case, pins 1, 2, 3 and 6 are in use (orange and green pairs) and rest are not.
Of course that assumes that the network speed is at 10Mbit or 100Mbit and not 1000Mbit
If the speed is at gigabit and tester claims it's open.. then something is more fishy since gigabit should not work with open wires.

The tester tests all 4 pairs (8 wires) and complains if any of them fail, as it should.
Also if router says "not connected" is it through said tester (based on software, software might draw it's own conclusions as it wants, in this case assuming that missing 1 or 2 pairs=not connected) or based on the link light?

 

[GraySenshi]

It is gigabit but for some reason it only shows as a 100 on the PC and the cable is 100% working and tested same with the switch

 

[little_me]

computer says it's 100, it's 100 and uses only 2 pairs. (likely the port on network interface is either broken or it was never meant to work at gigabit.)
If the card claims it could do gigabit, then I would most likely blame said port on the computer side.

 

[GraySenshi]

So the port is bad and can only use 100 so the the switch doesn't get the gigabit signal so it thinks it's a open line