Hey everyone,
I came yesterday to visit a friend of mine in Paris and noticed that his internet was really bad.

Speedtests:
https://www.nperf.com/r/3464552745810632-EidLD6kb
https://www.speedtest.net/result/15103214176

I have also attached a screenshot of the router info

Does any of you have any idea what can i do to make it better?

Hi MrNobody,

95% of Paris is covered by FTTH, so it is strange that your friend is still with ADSL, furthermore if he has a bad connection with ADSL. But there is still 5% not covered...

not so strange, where 5% of paris is still with old adsl lines
https://lafibre.info/ftth-la-fibre-optique-gpon-ou-p2p/toi-aussi-on-tas-fait-croire-que-tu-serais-bientot-raccorde/

Thanks for the further informations. What I see is that the line of your frient has a high attenuation, 45 db. The downstream rate is 3.2 Mb/s, it is coherent with this attenuation. There is perhaps congestion in the evening if you have a lower rate in the evening. It could correspond to a line length of about 4 km, depending on the diameter of the copper pair. If you did the OVH test I mentioned, we would have known if this the correct line length, or if the line is shorter, but there are defects.

I don't think there are a lot of defects, beacause the status of the line is correct, and I don't see much errors (for example FEC). The noise margin is a bit high, but not so much, with 8.7 db downstream (if thee is noise on the line, the noise margin has to be high not to loose the signal, but in this case, the speed drops). So it could be simply that the line of your friend is long.

In France, Internet providers propose a free migration to FTTH if it is available for them (in Paris, each provider has to connect the building with his own fiber lines, then connect to the PM, Point de Mutualisation, often in the basement). Because Paris is a very dense area, so it is profitable, and they are encouraged to connect themselves each building).

If your friend is with SFR, and SFR does not propose FTTH, it could be because they have not connected the building with thier fiber lines. It can happen because previously SFR/Numericable has a lot of coaxial cable in Paris.

So you have to test on each provider web site if FTTH is available by them, and if it is not available with SFR, but wirh another (Orange, Free, Bouygues Telecom), perhaps mgrate to another provider.

If your friend lives in a flat, he has to ask his building manager (syndic) to sign an optical fiber agreement/authorization.
After that, he sould be able to subsribe to an optical fiber within 9-12 months.

https://wbo.s.woopic.com/reseaux-bucket-wbo/media/courrier-proprietaire.pdf
https://wbo.s.woopic.com/reseaux-bucket-wbo/media/AS-25-ans-pour-IMB-non-precable_Syndic-proprietaires-uniques-AG-non-pertinente.pdf
https://reseaux.orange.fr/nos-reseaux/internet-fixe/comment-avoir-fibre

but until then there isnt anything I can request for them to improve in this line?

If the line is like this because of its length, no. If the attenuation is due to a defect, they may send a technician to fix the defect.

How many flat is there in his building ?
Did you check on https://boutique.orange.fr/internet/offres-fibre if the optical fiber is available for him ?

Hi there,

...
As far as I understand he gets the slow speeds due to the line beeing far way?
...

No, if we trust the data and plots you posted from the NB6V modem.

Line length is not the main problem, I believe.

Could you please post the value of Hlog(69) i.e. the value of Hlog at tone 69 ?

From the Hlog plot I reckon it should be around -36 dB.

Also, you had a resync ~2 hours after boot-up of your NB6V, according to the stats in Page_2.jpg.

Was that a spontaneous resync or was it provoked by you/yr friend?

And in view of the plots, the link rates of 3236/798 are suspiciously low, I believe. Something doesn't add up.

Your line is long(ish) but not that long in my opinion.

But I haven't done any calcs, so pinch-of-salt.

INP (Impulse Noise Protection) is rather high (58) Downstream, but you must have PhyR on, so not clear how that affects the link rate. Some longish calcs needed here to see if INP comes from FEC or not. In generel higher INP means lower link rate if under FEC. Nothing you can do here.

The QLN plot shows several +10dB peaks that certainly do not help and are the cause of the corresponding SNR and bitloading notches.

SNR max values in the plot seem to me also pretty low. QLN too high ?

In addition, SNR and bitloading go to zero right after tone 300 instead of going all the way to around 500-ish, probably also because the target margin value in your ADSL profile is around 9 dB. Any idea on that value?

The strong difference in Bitloading between Upstream and Downstream bands (11-12 vs 7 bits at the top) is also suspicious: perhaps the line is unstable and SFR's line management sw has been taking corrective measures.
Alternatively the last resync took place under increased local noise levels, different on the 2 bands.
After all, the stats show high error levels just in the first 2 hrs, before the resync.
Just thinking aloud here.

Any idea what the current ADSL profile is ? See  https://assistance.sfr.fr/internet-tel-fixe/box-nb6/parametrer-connexion-box-profil-usage-internet.html . I would not touch that for now.

Anybody speaks french on yr side? That would be for SFR's phone support service...

Good luck.