SFTP CAT5e for DSL installation

h-s

Since I upgraded my connection to 4mbps, my SNR became critical at certain times of the day. It used to be good until a month ago, I think it got lower from the CO itself. The noise is coming from electricity because the phone line is running inside the walls along with the electric cables. It goes down to 6.0dB, so it can't handle any fluctuation. Usually when state electricity comes, I have a disconnection due to the 3.0 down SNR. At night the SNR increases to 11.0 and the problem is gone. When there is no electricity, the SNR is around 21.0 to 27.0.

So I decided to get a CAT5e SFTP, shielded and foiled cable, connect it from the phone box directly to my room. The box is inside our building so there is not much distance, even an ordinary phone cable will increase SNR but since I am going through all this hassle, I will go with a quality cable which will further protect the line from noise.

FluxBB bbcode test

As you can see, the cable comes as four twisted pairs. I want to connect it myself, I don't have much knowledge about it. I think you will only need to connect two of the four colors since this cable can be used as a standard ethernet as well. Color doesn't matter but they have to be the same for both ends of course. I might be wrong, any help would be appreciated.

Stygmata

Why don't you use a shielded phone cable instead?

h-s

Wouldn't the foil layer add extra protection? there is a debate about it and I am not certain myself. There is STP cable at pcandparts as well. Where can I find it other than pcandparts?

Stygmata

Stp are shielded meaning a wire mesh encircle the twisted cables.
Ftp are foiled where the mesh is replaced with a metal foil.
Sftp has both foil and mesh . It provides the best protection against electromagnetic interference .

All are good as long as you ground both extremities of the cable (a small metal wire runs along the cable )

h-s

Yes I know about that, that is why I preferred the SFTP. I also read about grounding, however I still don't know how to do it properly and here is exactly where I need help.

Stygmata

H.S wroteYes I know about that, that is why I preferred the SFTP. I also read about grounding, however I still don't know how to do it properly and here is exactly where I need help.

you can find stp or ftp cable practically in any computer shop .
ground the cable requires too much things to do ( the metal line needs to be connected to a copper strand burried 1 meter underground and so on ) but still even if not grounded the cable will create a faraday cage keeping a lot of interference away ( also the coating of the cable can help as well )
you should not forget that sftp is thicker than regular phone lines and it might be an issue to run it through the wall tubes .

will you be using RJ11 connectors ? ( phone connector )

h-s

I checked pcandparts again, they have all three cables, STP is slightly more expensive than FTP and they all come as a standard 305M in length. I read a lot about grounding yesterday, as you said, it should be connected to a copper strand buried one meter underground. As the majority were saying, it is tricky to do the grounding in a home environment, I don't have any copper material buried around.

There were also a lot of debate about grounding from either one or both extremities. Grounding from both ends will create Ground Loops and if not grounding at all, the shield layer will act like an antenna and attract noise!

I will not install the cable through the walls even though it is shielded, that is the main reason I am getting a lot of noise. I still remember like six years ago, I was installing an ordinary, thin phone cable with an electrician and we were struggling, it was getting jammed with the power cables and it took us three hours. I will install it externally even if I have to drill the wall and pass it through.

I have an RJ11 surface mount box, so I don't have to crimp it to a connector. FluxBB bbcode test

Stygmata

Read about farday cage...the antenna theory is wrong

h-s

Stygmata wroteRead about farday cage...the antenna theory is wrong

How about using a UTP CAT6 [unshielded] instead of a shielded CAT5e? so I won't have to worry about grounding and since the CAT6 has significantly higher SNR than CAT5e?

Stygmata

Get an stp or ftp and ground it to any metal structure from a single end .

I prefer a shielded phone line instead with jelly filling

DNA

If the phone lines that are routed through the walls are not insulated this whole installation will not benefit you since the insulated line that you want to install directly from the box is basically extended through the walls without insulation because it is not isolated form the line so you will still pickup a hell lot of noise a washing machine will deteriorate your Snr lmao, try it but i am sure you will only see slight increase in Snr if you saw high numbers then it wasn't because of shielding but because u have a bad loop in the walls.

h-s

DNA wroteIf the phone lines that are routed through the walls are not insulated this whole installation will not benefit you since the insulated line that you want to install directly from the box is basically extended through the walls without insulation because it is not isolated form the line so you will still pickup a hell lot of noise a washing machine will deteriorate your Snr lmao, try it but i am sure you will only see slight increase in Snr if you saw high numbers then it wasn't because of shielding but because u have a bad loop in the walls.

Now that you mention it, as long as the washing machine is on, I completely lose connection even if the SNR is 10 plus, until it is off. If I won't have significant improvement in SNR, I have no other choice but to re-route the main cabling, something I am trying to avoid because it requires tons of work.

DNA

Adsl is such a miserable way for getting internet, the funny thing is that its the best way of getting internet in here *facepalm*

anyway dealing with connection issues is very hard, the problem may not even be in your house or at ogero but somewhere down the road where the cable is damaged or old you never now, the best way is actually to try different things to improve the connection and hoping it works.

h-s

I know right? All that talk about FTTH and still nothing. It is hard to pinpoint the exact source of the issue, but I am certain that this will improve the line, probably not dramatically but I have to do it because running the phone cable along with power cables without it being shielded is definitely increasing the noise.

I was thinking that the best solution to do it without going through the hassle of re-routing the phone cable inside the walls, is by eliminating the main cable completely, installing a CAT6 cable directly from the phone box externally, far from any power cable, all the way up to the apartment and distribute the cable where we're using two phones in two different rooms, then extend it to the final point which is my room and where the modem is.

Now it won't be as neat as installing it inside the walls of course, but it will save a lot of work and will eliminate all the noise coming from my end. A shielded cable won't be necessary because it will be installed externally and it is pretty far away from any noise source.

DNA

H.S wroteI know right? All that talk about FTTH and still nothing. It is hard to pinpoint the exact source of the issue, but I am certain that this will improve the line, probably not dramatically but I have to do it because running the phone cable along with power cables without it being shielded is definitely increasing the noise.

I was thinking that the best solution to do it without going through the hassle of re-routing the phone cable inside the walls, is by eliminating the main cable completely, installing a CAT6 cable directly from the phone box externally, far from any power cable, all the way up to the apartment and distribute the cable where we're using two phones in two different rooms, then extend it to the final point which is my room and where the modem is.

Now it won't be as neat as installing it inside the walls of course, but it will save a lot of work and will eliminate all the noise coming from my end. A shielded cable won't be necessary because it will be installed externally and it is pretty far away from any noise source.

sounds like a good plan, i really hope it works for all that hassle

hkbazzi

this post is a bit old, i would like to know the results!