PTT 298 in RJ45 is not working
brupala Posted messages 111943 Registration date Status Membre Last intervention -
Hello,
I recently wanted to set up cable internet in my room upstairs, with my box located downstairs.
I installed 2 RJ45 sockets, one downstairs and one upstairs.
To connect these two sockets, I used PTT 298 cable, making sure to use the correct color coding for a T568B wiring scheme.
However, after several hours of pulling my hair out, it's not working.
My box is connected with an ethernet cable to the RJ45 socket downstairs. The downstairs socket is connected to the upstairs socket via the PTT 298 cable.
The upstairs socket goes to a switch, and the switch goes to my PC.
The PC is not receiving internet; it doesn't even identify the network.
I have already ruled out a faulty box, a faulty ethernet cable, a faulty switch, and a faulty PC.
What should I do?
4 réponses
Hello,
certainly a poorly done wiring,
did you follow this:
try to send us photos of the wiring of your sockets.
A color convention in B makes no sense for PTT298.
Personally, for new wiring, I would never have chosen PTT298, but cat6A; PTT298 is basically for telephone or ADSL, we only use it for Ethernet when it is already in place.
And there you go....
But misery, how annoying those line spaces are!!
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Hello,
Thank you for your response. I thought about it, and after 3 checks, it still looks good to me.
I've attached a photo of my current wiring and the reference diagram I used.
I used 298 simply because I don't have much money, and cat6a was a bit too expensive for me.
Maybe it's the photo that's causing this, but I feel like some are not properly seated and the way this outlet is made makes it a bit annoying to insert the wires.
If you open it to remove the wires, are the wires well stripped?
Aside from putting the wires back into the outlets, I don't see what else to do; is it exactly the same on both sides?
The ptt298 is very good; I’m currently running 1 gigabit through it.
Indeed, the cables are well inserted, and it is the same arrangement on each side, but they are not stripped when I pull them out of the socket!
Could it be due to a cheap socket?
In this second photo, we can see the connectors better, yes, thank you.
I have the impression that some wires, particularly the orange and white ones, as well as the blue, do not reach the connectors; the wires should all extend to the end to almost touch the transparent locking mechanism.
Indeed, these cheap connectors often cause problems as well as more difficult assembly: it must not be easy to position all eight wires at the same time.
Moreover, it is not possible to use quality cable, like grade 3, in there.
https://forums.commentcamarche.net/forum/affich-37585049-compatibilite-cables-et-prises-rj45
Hello
You bring down your PC and your switch and you connect it to the switch instead of the wall.
Does it work? With the 2 cables?
At least you'll know if it's just between the 2 sockets. And here, first, it's a connection or poorly done.
Hello
In theory, electrically a cable called ptt 298 in rj45 connected with all the wires of course, whether A or B as long as it’s the same on both sides or for the whole apartment if you’re using a “star” configuration, it’s like the American standards with the other colors.
The lowest standards are indeed for “copper phone” which is no longer being used in new installations.
For insulation and interference, there are twisted pairs, the more shielded, the better, as soon as you want gigahertz, the old setups before 2011 are done, otherwise you’re limiting yourself to 100MHz while the standard is 1000 MHz for Gigabit. (Some try with minimal interference, just don’t add powerline adapters...).
Wall sockets cost more than the cable. But the most expensive are the devices, the panel, and everything we put inside it for example.
Back to the star configuration, each socket is connected to a unique patch panel, there’s more cable length, especially you need to connect the 2 cables in this panel as Jumulka said, otherwise it won’t work.
Your description is the exception of 2 sockets with the most direct and shortest cable possible without going through the patch panel and avoiding running alongside other electrical circuits, maybe not the standard but it should work. It’s the crimping and the quality of the sockets that are costly, very good cable is sold by the meter for a single cable, you no longer buy the whole reel. Normally you might have everything new, just the connections and the wires in the right places, breaking a new wire is rare.
Confusing MHz and Mbit/s is not a great sign of mastery on your part....
Having the wiring of the outlets the same on both sides is a good start, but it's not enough; you also need to avoid untwisting: a twisted pair must arrive at the same two points at each end, and these 2 points must correspond to a pair: 1-2, 3-6, 4-5, and 7-8.
Hello
Yes, thanks for the catch. If I don't proofread 10 times, I make spelling mistakes, and I made an addition at the last moment; I mentioned MHz when it's actually about bandwidth, those famous 10-100-1000 Mbps of the wiring and Ethernet ports of the internal network, which struggle to exceed the 100 Mbps limit when everything isn't shielded from interference.
The proper connection of pairs 1-2, 3-6, 4-5, and 7-8 is important. When he says he correctly followed the color codes to use PTT cable and RJ45 jacks in B configuration, he's supposed to follow the diagrams of the jacks that clearly show this distribution of pairs; at least those I’ve seen always had it noted.
There are indeed testers to check the network wiring; you need a minimum of connections if you don't want to buy one for a single cable. Often, it also helps to not be alone in troubleshooting.
The problem is that the PTT298 does not have the wire/pair colors indicated in the RJ45 connectors that are marked for TIA 568A/B.
Re
We're in agreement. We shouldn't confuse straight cables and crossover cables either. Here too, we're talking about A or B wiring, but that doesn't mean the same thing.
https://community.fs.com/en/article/t568a-vs-t568b-difference-between-straight-through-and-crossover-cable.html
In a wall, a straight cable is needed. The order of the wires is the same at each end of the cable, so on each wall socket. That's what's done here.
If we use PTT cable for a wall cable in 2024, we know what we're doing, we know that the colors are not the same as in some diagrams, we know we have to respect the pairs, we know we're not always compliant, especially for obtaining an approval certificate.
And there are things that can only be seen on-site when something goes wrong. Bad contact, a short circuit from a tiny piece of copper wire fallen from a braid, an error in transcribing an electrical diagram when the wire colors are not the same... Only those who do nothing never make mistakes.
Hello,
If the cable is new, apart from a wiring issue, I don't see what it could be.
If it was an existing cable, are you sure your cable goes well from one socket to the other?
Hello! Thank you for your response.
The cable is indeed new, the wiring seems to be correct, all the wires are properly seated, and normally, all the RJ45 connectors are self-crimping. However, it is supposed to work, but it doesn't.
Well,
I’m not familiar with this model of sockets and although the photo is very good, the angle of view does not allow for an assessment of whether the CADs have fully played their role.
The twisted length is a bit long, but it’s not catastrophic.
The order of the pairs on the labeling is a bit strange and does not correspond to the natural position of the contacts.
I think that only an RJ45 wiring tester could evaluate the quality of the connection because from this angle, the visuals look correct, although I don’t see how the locking actually works; I think the wires should pass through and reach the end of the transparent part of the comb/guide.
And there you go, there it is ....
But goodness, how tedious the line spacing is!!