Yes, it seems you are right that with a 15dB profile my upstream should exceed 20000. But it doesn't really bother me as the TalkTalk ISP and all FTTC providers will lock the speed to 20Mbps upload anyway. As long as the upstream always remains at that, that's all that matters for me.

It could also be the TalkTalk Wi-Fi Hub router that is programmed to sync at that speed or is either misreporting.

My downstream is actually a 6dB target because I've seen it at 6.40dB a few days ago and it dropped to 5.90 and now hovers to 6.00dB. Maximum Rate [Kbps] 80534

I strongly suspect because of the gust winds and rain as before that noise margin was 6.40dB.
So far my connection up-time has been 14 days! Something that was impossible to achieve on ADSL with a 6dB noise margin profile. On ADSL I would always have to contact my ISP such as with Sky or Plusnet either by phone or on their forums to lock the noise margin to 9dB for the connection to be stable.

Under FTTC my connection seems to be stable so far with little fluctuation in noise margins. This can be partly explained from the fact that my cabinet is 290 meters of copper vs 1000+ meters of copper to exchange on ADSL.

Edited by BLaZiNgSPEED (Thu 20-Feb-20 17:56:57)

My line attenuation is exactly the same as yours on my HG612. On my old TP-Link Archer used to say 12db.

I'm at least 300m away from the cab, just not sure the route of the line as this house was one of the last finished. It's all underground.

BT checker says Clean 79.4 to 56.2. Impacted 77.1 to 52.5.

Edited by wolvesmad (Fri 21-Feb-20 19:38:54)

At a rough guess i'd say it's 350m away.

That sync 68/20 is with G.INP on, 6db SNR, which seems to sit at 6.5db all day / night.

In reply to a post by wolvesmad:

BT checker says Clean 79.4 to 56.2. Impacted 77.1 to 52.5.

My parents bt checker says below:

High Low High Low
VDSL Range A (Clean) 79.2 55.8 20 18.5 50.1 Available Available --
VDSL Range B (Impacted) 77 51.8 20 16.6 44 Available Available --

Observed Speeds


VDSL
Max Observed Downstream Speed (Mbps) 46.36
Max Upstream Observed Speed (Mbps) 20
Observed Date 2020-02-20

Edited by adslmax (Fri 21-Feb-20 21:10:13)

I'm expecting around 72-73 / 20 on a 3db SNR.

Can't see me getting the full sync.

Just wondered what the delay in DLM has been.

I never big fan in Openreach DLM on FTTC. But I was very lucky as my line can do G.fast 229/50 and 80/20 on FTTC.

My cab is a small single door and the FTTC cab is a 128 line Huawei so ive got little to zero chance of G.Fast.

The other twin door cabs around here have pods on.

No cable.

So I'm on FTTC for the foreseeable.

This is what the checker says for my line at 330 to 360 meters.

VDSL Range A (Clean) 80 62.4 20 19 56.9
VDSL Range B (Impacted) 80 60 20 19 54.9


And stats when I was on VDSL

Connection Speed 79999 kbps 19999 kbps
Line Attenuation (dB) DS1:9.5 DS2:20.9 DS3:31.1 US0:5.3 US1:17.8 US2:24.6
Noise Margin (dB) DS1:6.5 DS2:6.5 DS3:6.5 US0:13.7 US1:13.8 US2:13.8

Edited by lockyatlrg (Sat 22-Feb-20 01:16:48)

In reply to a post by wolvesmad:

My line attenuation is exactly the same as yours on my HG612. On my old TP-Link Archer used to say 12db.

I'm at least 300m away from the cab, just not sure the route of the line as this house was one of the last finished. It's all underground.

BT checker says Clean 79.4 to 56.2. Impacted 77.1 to 52.5.

My cabinet is located in 46 Frostic Walk, Shadwell, London E1 5LT https://www.google.com/maps/dir/Bishopsgate+Telephon...
Just for my own security I did not include my home. Just cabinet location and BT Exchange location.

As you can see Bishopsgate Telephone Exchange, 20 Jerome St, Spitalfields, London E1 6NJ in my case takes a route via Brick Lane and then back to 46 Frostic Walk and from there to my home via Wentworth Street. This artificially increases the length of the copper travel. But if we were to include this route to my home from exchange it becomes 960+ meters to home with ADSL pure copper and add 40 meters and it's like 1000 meters.

When we exclude the telephone exchange and only connection from the cabinet to home that is around 290 meters. The way I do this is by calculating the length of copper from cabinet to exchange which is 0.4 miles ~ 644 meters. Now that would be around 644 meters of Fibre traveling from BT Exchange to the cabinet and the rest of the 300 meters is copper to my home.

This is probably not the most accurate estimation of the measurement, but it is very close and is reflective of the speeds I am getting.

So far my line has been like this...
Line 1
Downstream Upstream
Actual Rate [Kbps] 80000 19999
Maximum Rate [Kbps] 80534 19999
Noise Margin [dB] 5.90 15.00
Attenuation [dB] 17.90 0.00
Power [dBm] 13.00 7.60

My Internet Connection

Status
Connected

Current speed
Download
80.0 Mbps
Upload
20.0 Mbps

Connection up-time

Connected since 15d 11h06m41s

Noise margin has been stuck to 5.90dB and has not returned back to 6.40dB. Only positive is so far 15+ days stable connection uptime. This has never ever been the case with ADSL. With a 6dB profile on ADSL my connection would drop-out 2-5 times a day! But here via FTTC now it has been a good 15 days so far. As long as those noise margins don't yo-yo too much connection should remain stable for a long time.

I'm glad I am getting these speeds. Because my management team have refused to grant wayleave to Hyperoptic for FTTP.

If your figures are showing 79.4 you should be getting that at least in your router stat unless you are suffering crosstalk or some other issues such as router.

I should be getting a little more really then even at 6db. The only thing I can think is the crosstalk is rather high due to the lack of Virgin cable here.

BT have recently fitted an extension to the FTTC cab do it's definitely busy.

At my previous house, my attenuation was 16db and on a 3db SNR with G.INP on, I connected at 74/20.

Also in an area with no cable and high cross talk.

Edited by wolvesmad (Sat 22-Feb-20 10:47:55)