RJ45 wall socket wiring: 468A or B?

Question

Hello,

the post is dated but I'm trying anyway...

I'm currently installing RJ45 wall sockets, and there's one thing I still don't understand. If I wire my sockets according to 568A while connecting them to cables that conform to 568B (all my cables are like that), does that create a crossover wiring?

To me, yes, but one thing bothers me. I've never seen anyone in a company question whether they arrived with a laptop and some random RJ45 cable about whether the company's wiring was done in 568A or 568B...

Yet at home I have a speed of 10MB/s instead of 80MB/s... so I have a problem!

Thanks in advance.

François

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melec · Accepted Answer

Hello,

You can do wiring A or B, but it must be identical from end to end of the cable to have a straight connection; it is often wiring B that is chosen.

You get a crossover, for example, if you connect the wall socket in A and the patch panel in B.

Best regards

phil2k · Answer

Hello

For the wiring, as Melec said, A or B, but the same at each end.

Yet at my place I have a speed of 10MB/s instead of 80MB/s...so I have a problem!

Here, there is a problem:
cable, if it’s not cat5E or higher
unpairing. Absolutely must respect the pairs green/white-green, orange-white-orange, etc.

Also pay attention to pair 3-6, (green/white-green in wiring 468B)....

--
"To fix something that’s not working or is too noisy, you just need to hit it with something that works better or makes more noise"

TBou · Answer

Thank you for your responses, but I don't understand everything. I will therefore explain my wiring more clearly.

I have a total of 3 wall outlets. 1 in one bedroom and 1 in another, both connected to a "double" outlet in my living room. From my living room wall outlet, I have connected two short cables that are connected to my router (Apple Airport).

I wired all my wall outlets using 468A, but my short cables that connect my outlets to the computers (1 in each bedroom) or to the router are in 468B (which is noted on them).

However, everything is in CAT6 (outlets and cables).

Is the use of short 468B cables causing a crossover wiring and reducing my speed to 10MB/s when I transfer files from one computer to another?

In any case, when I connect my two computers directly to the router, everything works well... as long as I don't go through the wall outlets, everything runs at 80MB/s...

Thank you in advance.
François.

TBou · Answer

I just checked, they don't seem to be crossed when I look at the connector, it's the same color code...

Moreover, when I use these same cables by directly connecting both computers to the router, there's no bandwidth issue. (60MB/s)

But if I go back through one of my cables run through the conduits and connected to the sockets, it drops to 11.7MB/s. I've tried the two large cables separately and it’s the same. Is there no way to know if my two large cables are crossed? It's never noted on them? Otherwise, what I don't understand is that even if they were crossed in the first place, I should have "uncrossed" them since I wired each end the same way. 568B now! Everything is in 568B, cables, sockets, etc...

I'm lost and it's starting to seriously annoy me!

Thank you for your help!

TBou · Answer

I wired everything in 568B:

1> White/orange
2> Orange
3> White/green
4> Blue
5> White/blue
6> Green
7> White/brown
8> Brown

And let's say I made a mistake (which is not the case, I've checked many times), since I tested them separately by connecting one of the two computers directly to the router each time, it would have worked one time out of two...
I tried crossing it at first, then everything in 568A, and now everything in 568B
...I'm slightly tired of redoing everything...

I don't understand, I've wired hundreds of audio, video cables, etc... never had to redo one, but this RJ45 is a nightmare!

:o(

phil2k · Answer

The wiring is correct. The PCs display what connection speed, 100Mbits/s I suppose going through the wiring, and 1Gbits/s directly? "If there is no solution, then there is no problem."

phil2k · Answer

So there would be a problem with the wall wiring,

a "double" socket in my living room
I suppose it's 2 sockets side by side?

This allows for the possibility of a wiring error, but you checked
a cut wire in the wall wiring (the 100Mbit/s connection uses pairs 1-2 and 3-6, in gigabit it uses all 4 pairs)
a problem with crimping the wires on the wall sockets ......
--
"To fix something that doesn’t work or is too noisy, all you have to do is hit it with something that works better or is louder."

brupala · Answer

Hi,
I don't know what your wall sockets are like, but normally no tools are needed.
For the Legrand Mosaïc, for example, you just need a knife and a wire cutter to cut the wires, the rest is tool-free.
http://lamaisonboisdenous.over-blog.com/article-montage-prises-rj45-63520730.html

https://www.youtube.com/watch?v=VFyUYaClAUw
In the video, the guy is poorly equipped, he has a wire cutter that's way too big, which means he cuts the wires before locking the contacts; it should be done the other way around, cutting them when they're locked.
Also, you can't see what he's doing very well.

this one is completely upside down by placing the wires (far too long twisted, therefore) on the CAD instead of just going back to the white and black hubs, then locking and cutting them after.
So it's more complicated, and the wires are untwisted longer when the sheath should go all the way to the white part (the locking).

The right method is here:
https://www.youtube.com/watch?v=nxtefsko--4

however, for keystone of this kind, the right tool is necessary

and ... There you go!

Blue22Eagle · Answer

Hello,
If that doesn't solve the problem, I have a "half solution": we should check the type of transmission on the network cards, forcing half duplex transmission instead of Auto which assumes full duplex (the problem is when one card decides to transmit in full and the other in half), half solution because the speed will be halved (it's still better than a speed divided by 10!!).

george · Answer

Almost a year, I saw.

We are talking about unshielded twisted pair RJ45. "E5" just, AA AB or AB all modern devices auto-detect, we don’t care.

## If a direct connection to the switch shows a much higher throughput than "going through the wiring in the wall".

Test the wall by short-circuiting the pairs on one side and using an ohmmeter on the other, the resistance should be tiny/negligible.

## If the electrical continuity is perfect, the issue lies in telecommunications. There are places where the signal bounces or attenuates...

The "plastic things"/"caps"/"connectors" in the rack are too long untwisted, or "worn out", the metal pins are not well plated on the plug, they jiggle with vibrations... Change them.

Or the cables are much too long compared to the standard (cat5=100m decreased by each bend and plug), place relay switches.

Or the cables make right angles "they spread the signal", are rolled up on themselves "they act as an antenna": Cut them as short as possible and leave rounded angles. Like 10-15cm in diameter.

## Otherwise, the noise There are machine tools or high voltage cables or such next to the unshielded 5E cables:

The shielded 6E cables must be grounded: The "ground wire" connects to the "metal plug", which touches the PC case and the switch, which are connected to the ground.

Optical fibers are practically invulnerable to EM noise.

------------------------------

There is a magic tool http://www.cdiscount.com/maison/r-testeur+rj45.html#_his_

++

RJ45 wall socket wiring: 468A or B?

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