Telephone line voltage [unbundling]

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leelou_din Posted messages 2 Status Member -
PhilMGN Posted messages 54 Registration date Status Member Last intervention - 4 Nov 2016 at 22:20

Hello everyone, before unbundling the voltage measured between terminals 1 and 3 of the FT central is 48 V DC.....

My line has just switched to full unbundling (Freebox), and I would like to know what the voltage is between 1 and 3 for an unbundled line..... Because for now I have no voltage at all!!! So no phone, no internet...etc

Thanks

9 answers

Answer 1 / 9

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brupala Posted messages 111154 Registration date Status Member Last intervention 14 451

hi,
a line in total unbundling no longer has a 48V voltage but a zero voltage and no telephone, that's the basic principle.

When the ADSL is restored, you will then have, all going well, IP telephony.
43
1. JPB
  
  Thank you very much brupala
  
  JPB
  
  1
2. klist Posted messages 1 Status Member
  
  Hello, Orange subscriber, in full unbundling, the 48v is indeed present on my line.
  This seems logical to me since its role is to "wet" the line to avoid connection faults in the distribution frames and junction boxes.
  It is not strictly necessary for the functioning of ADSL.
  Probably used for long and problematic lines.
  
  0
3. PhilMGN Posted messages 54 Registration date Status Member Last intervention 73
  
  Thank you Brupala
  my measurements show: 0 volts, infinite resistance, and 13 nanofarads... but unfortunately my Freebox is not syncing. It smells like a technician appointment...
  
  0
Answer 2 / 9
myamigos

Hello,
I am on naked ADSL, I have 53.3V between 1 and 3...
Sorry for brupala...
21
1. brupala Posted messages 111154 Registration date Status Member Last intervention 14 451
  
  don't be sorry:
  it's not normal, it's a mistake.
  it's that FT is not charging you for the subscription but your line is still connected to their PABX.
  this situation shouldn't last.
  --
  and ... there you go!
  
  0
2. brupala Posted messages 111154 Registration date Status Member Last intervention 14 451
  
  For a year, I've had some explanations:
  actually, it's as FT wants it, it depends on the locations:
  sometimes they leave you connected to the PBX without charging a subscription, which allows you to make emergency calls: 112, 18, 15, 17 ... 1013 ??
  and sometimes, no, they disconnect from the switchboard.
  it's up to them.
  --
  and ... there you go!
  
  0
3. Marcel > brupala Posted messages 111154 Registration date Status Member Last intervention
  
  All the naked ADSL lines at Orange have a tone (busy), so 48v, which allows for remote line testing.
  
  0
4. brupala Posted messages 111154 Registration date Status Member Last intervention 14 451 > Marcel
  
  no, that's not true,
  there is also a continuous tone that allows emergency calls to be made, depending on the locations, at first we saw lines without 48V, but now it's rarely the case, indeed.
  --
  and... there you go!
  
  0
5. freko33520
  
  Sorry Brupala, but I am an Orange technician and in most cases, there is a line blockage (it will be resolved once the Livebox is connected to the FT socket). The service is effective once the synchronization is established (@) !!!! Sometimes there is a tone due to line construction, but this does not allow any calls. Message stated: you cannot make a call, please contact France Telecom at 1013.
  
  0
Answer 3 / 9
MojeZogby

In order for the information to flow between the telephone exchange and the terminal telephone socket in the home, there must be an electric voltage to carry the signal, even in unbundled situations... Therefore, I would be very surprised if an unbundled or functioning line presented a voltage of 0V...
14
1. brupala Posted messages 111154 Registration date Status Member Last intervention 14 451
  
  It may surprise you, but that's how it is:
  the direct current (48V) in traditional analog telephone lines is only used to provide the off-hook condition for the line and power older phones.
  each ADSL frequency (there are dozens of them) is a carrier that transmits a portion of the digital flow, these carriers are more similar to radio operation than electricity.
  see: https://www.commentcamarche.net/contents/1110-adsl
  
  and ... Voila Voilou Voila!
  
  0
Answer 4 / 9
b-sab

It’s been a year since I stopped using ADSL filters; I’m with Neuf Telecom (SFR).
After a complete renovation of my electrical, telephone, and TV installation, I plugged my modem directly into the new RJ45 telephone socket, and everything works perfectly. There are no filters inside my apartment; I checked. From the France Télécom entry point located at the electrical panel, my line goes directly from the panel socket marked TEST. I’d like to point out that it was my electrician who advised me not to use a filter; he removed my filter himself and reconnected my modem to the new socket he installed.
7
1. Max
  
  It's normal... a fully unbundled line doesn't need a filter, simply because there is no longer any tone on your socket, so there's no phone number except for your 09 from your box.
  
  The filter is only needed for an ADSL subscription where the FT line is still retained.
  
  0
Answer 5 / 9
Belzebuth

Thank you for your response brupala...

Free informed me that my line was connected, however... and was even able to provide me with the distance from my home to the DSLAM as well as the attenuation of my line... (when I check the technical characteristics of my line on my Free account)

Could there still be another step after that?
6
1. brupala Posted messages 111154 Registration date Status Member Last intervention 14 451
  
  this is the data from the file, not the technical interventions, it's easy to fill out a file but it's longer to wait for FT to do the work.
  anyone can get this data on a site like degrouptest or ariase.
  anyway, as always in the commercial field: theory goes much faster than practice, and it doesn't bother Free either, it allows them to charge you for the subscription from that moment on.
  --
  and ... there you go!
  
  0
2. Belzebuth > brupala Posted messages 111154 Registration date Status Member Last intervention
  
  Thank you very much for this explanation!
  
  I will therefore deal directly with Free... now that I know who to turn to!
  
  0
3. FT > brupala Posted messages 111154 Registration date Status Member Last intervention
  
  Brupala works at FT, I confirm your answers are quite good for your reasoning if you don't work with us.
  
  0
4. brupala Posted messages 111154 Registration date Status Member Last intervention 14 451 > FT
  
  Hi,
  I don’t work for Orange, but I hang out with them a lot ;-)
  
  0
5. brupala Posted messages 111154 Registration date Status Member Last intervention 14 451 > dolarg77 Posted messages 1 Registration date Status Member Last intervention
  
  I think the plot (common point for the distributor) is not yet connected to the Orange DSLAM, it's just a patch cable to be wired (a few meters of twisted wires).
  Technically, a few minutes, but administratively, quite a few days :-(
  
  0
Answer 6 / 9
JPB

Thank you very much brupala

To clarify, I was left without internet and thus without unlimited phone service with SFR. It was very difficult for me to reach them, not to mention the cost of my calls with my mobile phone.

That's why I was stuck on my ideas about measuring voltage on the line. I found no voltage on my line and on another one that has internet. However, on my neighbors' 2 lines that do not have internet, I measured 52 volts.

So with a multimeter, what measurements can I take to check my line?

With all my thanks.
JPB
6
1. brupala Posted messages 111154 Registration date Status Member Last intervention 14 451
  
  Aside from the voltage, you can measure if there is a short circuit between the wires; in total unbundling, the resistance should be almost infinite (check for the absence of voltage first) and if you use a capacitance meter, the capacitance between the wires should be in the range of 1 to 500nF.
  But the real reference is an ADSL tester or, at a pinch, a modem.
  The other measurements are complementary to try to locate the fault.
  
  0
Answer 7 / 9
bodyh

Hello everyone, following a bad manipulation I made the wires 1 and 3 of my phone socket touch and since then I have no tone. But since a problem never comes alone, I am currently switching to full unbundling, so I don't know if I'm the issue or if it's FT. I was wondering if it was possible to blow a fuse on the FT terminal because there is no longer 48V.
3
1. brupala Posted messages 111154 Registration date Status Member Last intervention 14 451
  
  Hello,
  lesson for everyone:
  the fact of making the two telephone wires touch cannot cause damage to the line or the fuses, it’s something perfectly normal for the telephone exchange, a line loop.
  The fuses were (are) there to protect (somewhat) against surges caused by lightning.
  On the other hand, if you are in complete unbundling or naked ADSL (it’s the same thing), it is perfectly normal that you do not have 48V or a dial tone; this is even the main characteristic, as you are no longer AT ALL connected to the telephone exchange: you are only connected to a DSLAM.
  --
  
  and ... There you go!
  
  0
Answer 8 / 9
JPB

Hello

In the case of a telephone line, it is easy to determine if an issue is coming from the line or from the installation in the house by measuring the voltage.

In the case of ADSL, how can we identify where the fault is?

Best regards
JPB
3
1. brupala Posted messages 111154 Registration date Status Member Last intervention 14 451
  
  with an ADSL modem...
  plus possibly other devices: echo meter, multimeter.
  
  0
Answer 9 / 9
Belzebuth

Hello,

I just had a line connected by the FT technicians to have a total unbundling by Free, but when I connect my Freebox (the ADSL modem, of course), the light remains slow and stuck on step 2, so it doesn't find an ADSL connection.

I was thinking I could test the FT line to see if the issue is with the wiring or with Free... is there a simple way to test it (without going through extremely expensive rental equipment!)?

Thanks in advance
3
1. brupala Posted messages 111154 Registration date Status Member Last intervention 14 451
  
  unfortunately not,
  specific devices are needed to test the phone lines in this case.
  First of all, you'll just have to be a little patient.
  Unless you know someone with connections at France Télécom to wire to the distributor towards Free's DSLAM.
  --
  and ... Here you go!
  
  0

Telephone line voltage [unbundling]

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