LAN cable only works at 10Mbps, not 100Mbps—how to test cable quality remotely?

Hello.
I have a problem with my home network.
I had two computers connected with a crossover cable, but the problem was that it only worked in the configuration when there was a 10MBps card on one computer at 100, it did not work anymore.
I thought that the motherboard did not work on these cards because it was old equipment. But I changed my computer recently and it's the same.
does not work when in two computers there are "Hundreds" cards, but (on another-uncrossed cable) connected via HUB (only HUB is also "ten")
My question.
Is it possible to check the cable in some (not mechanical) way? (I will not reach with an ohmmeter because the cables are flying somewhere behind the wall and in the attic).
Why does it work at 10Mbps and not at 100Mbps?
Because there is probably only the question of the cable. in total, I replaced two whole computers. I've already connected 15 power cables and the same on each one.
Do you have any suggestions?
Regards

You can reach for an ohmmeter, short the contacts at one end and check all transitions at the other end.

There are special testers to check the cables - a terminator is attached on one side of the cable, and a tester on the other side shows the condition of the cable - detects breaks, short circuits, swapped wires, swapped pairs. Ask your friends - every self-respecting network administrator (housing estate, block network) should have such a device.

I don't understand too much of the first statement ..
How can I reach if my computers are a few meters away from each other? It's all about the distance between the ends of the cable.

As for the testers, I know that something like this exists, but unfortunately I do not have it and I doubt that any friend would have this miracle in "condition"
Regards

creepingdeath wrote:

I don't understand too much of the first statement ..
How can I reach if my computers are a few meters away from each other? It's all about the distance between the ends of the cable.

You don't need to reach both ends. Simply short the wires at one end and check the transition with an ohmmeter at the other end.

indeed. I did not think ... thanks for the advice ...
I won't check it until tomorrow. I changed RJ once today
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May 5, 2006 3:55 pm
Okay. What, gentlemen, would you say that I checked the cable and everything is ok?
Why is it not working?

Moderated By TONI_2003:

Post has been merged!

Maybe the twisted pair is not the fifth category?

Well, I don't know.
I got it for free from a friend who put the net.
It seems ok. But there is nothing to judge by its appearance ..
But can it be that it works at 10Mbps and not at 100 ??
It pisses me !

If the cable between computers is longer than 100 meters, they may or may not occur, it all depends on the cable on longer distances, it may become necessary to ground the screen, just do not make it an antenna sometimes, ask someone who has already done it for help. The best solution would be to measure the network classification Fluck, because few people can afford the certifier

This cable is probably about 12 meters in length. And I don't have such miracles. : /
Do miracles happen at such a distance? I do not think so..

creepingdeath wrote:

I checked the cable and everything is ok

What does it mean? Please describe how both ends of the cable are connected using the colors of the individual wires.

Looking from the side of the pins with pins up, from the left, on one side I have this:
green-white
blue
orange-white
green
blue and white
orange
Brown and white
brown

second ending:

orange white
orange
green-white
green
blue and white
blue
Brown and white
brown

That's right ??
Regards

It is not entirely correct.
http://www.hardwarebook.net/cable/network/ethernet10basetcrossover.html " target="_blank" rel="nofollow noopener ugc" class="postlink inline" title="" > http://www.hardwarebook.net/cable/network/ethernet10basetcrossover.html
You have the correct connection written here.

NO, it was not really well done ...
But I corrected it and it's exactly the same!
What do you think??
I only have the blue and green color changed, but the signal will not be offended if it flows with a different color :)

PS: I checked 3 more times. Now it is cross correctly according to the page you gave me. There are passages on every cable, but it doesn't really want to work.
The computer cannot find the network address. Manually typed IP does the trick, but it's okay. But the network is down.
Anyone have an idea?

And what do the LEDs on the cards look like when you hook up the cable?
As for earning plugs, I understand that he is using the right crimping tool.
Check the plugs are correct I once encountered the fact that the plugs were for the cable and someone tried to tighten them on the wire and it did not work or vice versa I do not remember anymore.
What is the order of the cables, it should be like this:

You should connect it all like this:
(plug1) color (plug2)

(1) white-orange (3)
(2) orange (6)
(3) white-green (1)
(4) blue (7)
(5) white-blue (8)
(6) green (2)
(7) white-brown (4)
(8) brown (5)

The colors can be changed, it does not matter much, it is important that they are in the right pairs, if you change white green to white blue, then also change green to blue. But it's probably obvious.

Samuraj wrote:

And what do the LEDs on the cards look like when you hook up the cable?

Green is on and orange is blinking.

Samuraj wrote:

As for earning plugs, I understand that he is using the right crimper.
Check the plugs are correct I once encountered the fact that the plugs were for the cable and someone tried to tighten them on the wire and it did not work, or vice versa, I do not remember anymore.

Unfortunately, I clamp with a thin screwdriver because I do not have a crimper. : /
But it doesn't really matter either. Since the cable is conductive.

creepingdeath wrote:

But can it be that it works at 10Mbps and not at 100?

Theoretically it could be ... http://en.wikipedia.org/wiki/Category_3_cable
The cable should be printed with information about the category.

Mine is Cat. 5e

And to be clear now, I connected it like this:
(1) white-orange (3)
(2) orange (6)
(3) white-green (1)
(4) GREEN (7)
(5) white-blue (8)
(6) BLUE (2)
(7) white-brown (4)
(8) brown (5)

As in my case it is wrong. The signal is in pins 1 + 2 and 3 + 6.
4,5,7,8 are redundant. Therefore, 1 of 2 and 3 of 6 must go hand in hand.

Because it's actually bad. Swap blue and green on both plugs. A power cord is not a simple multi-wire cable: these are specific pairs of wires.

How can 8 cables confuse your head?
For me it is also good.
After all, I have it as in the diagram. Only in the first ending I have changed green to blue. But at the end, I also changed so only the color is wrong. But the connection is fine.

After reading the post, menka adds:

Approx. Since it has an impact, this change ... But probably not today because I'm done RJ'y
I will let you know how to replace or work

I wrote that the cables must be in pairs. As for 3 you have blue, for 6 it should be white and blue.
If you give 3 green, then 6 must be white and green.
The same is true of 1 and 2.

OKAY.
I forget it in the evening or during the week and let you know.
Meanwhile, it's over because I already have enough of these cables, colors and everything.
I was only surprised that at 10Mbps it works and at 100 it does not: /
But apparently the frequency is already mixing here with this arrangement of the cables

please watch pictures here: http://www.southwest.com.au/~jfuller/rj45/rj45.htm

I've looked at it but I'd rather not go into it because it's probably different here. But maybe I will make this tester one day. Regards

The colors don't matter
At least at these 12 meters, although I personally checked over 100 in a different order and it was going.
Couples are important 1 of 2 and 3 of 6.
compare all the pictures shown.
And one more thing in a straight cable you have 1 to 1, i.e. in the first plug, the cable from 1 pin goes to 1 in the second and so to the end. But this is the cable between the device and the Uplink.
In your case, you need a cross, i.e. from the first pin in the first plug to the 3 in the second, from 2 to 6, from 3 to 1 and from 6 to 2. But I repeat again, it is important that the cables are in pairs 1 and 2 is the same couple.
and here's a drawing if the text doesn't speak.

OK thanks for any tips.
I will come back to the topic on Monday.
Regards.

PS: just one more thing.
Does it matter which end of the cable is at the computer that provides the Internet connection?

No difference.
Why ?? - look at cable 1 goes to 3 and on the other hand the other 1 also goes to 3

The only difference between the plugs is that the green and orange pairs are changed as above in the picture ...

If you have earned RJ'otka correctly (links already chiba is enough) and does not want to go to 100M, it means that with the cable "something wrong". 12 meters of cable is PLN 12 in the most expensive store, and you have been struggling with the problem for some time ...
In addition, if there is no need to pull (holes in the walls, etc.), they should earn you any length in the store.