FTTC line banded after wiring fault - no luck requesting DLM reset

[f_250swb]

A few months ago I had a copper wiring fault in my house, which I managed to resolve myself, but not before FTTC DLM had banded my line to 34999bps downstream. I took the advice of waiting for weeks and months for the banding to be released automatically, but it hasn't happened - it seems stuck and needs intervention.

Various calls and chats with VF support have not yielded the necessary Openreach DLM reset as when they look at my line, they say there is no fault now / all looks fine / no reset required / can't do anything / Openreach only reset after THEY fix a fault.

The line has been stable for months, with very low errors (ES & SES) and is capable of ~50Mbps at 3dB SNR. It is currently running at 35Mbps capped with an SNR of over 12dB!

Can someone on here help me escalate this as I can't get past 1st line support, who give me the brush-off each time 😞

Before and after screenshots below:
Before banding - all good for several years:

After banding (now and past few months):

Thanks!

[Ripshod]

Doesn't look as bad as you're making it out to be. A loss of 4Mbps download is certainly nothing to worry over.

I wouldn't trust those figures - 34.998 line rate (downstream) would not support 47.541 Mbps bandwidth with the standard vdsl2 connection. Vodafone don't use G.fast as far as I'm aware.

[f_250swb]

Thanks, but it's a loss from ~50Mbps, (missing 15 or so) - the line performance before the banding happened (shown in the upper screenshot). It sat at this for years, with 3dB SNR, quite happily.  I never put too much store in the attainable rates either. The 50.194 was a genuine long term sync rate before the 'event'.

No Gfast, as you say, and no prospect of FTTP out here in the wilderness, so every MB counts!

[Cynric]

@f_250swb Can you describe what was the copper wire fault that you fixed and how you fixed it please?

[f_250swb]

Hi, it was a flaky connection inside the terrible push-fit connector of the Openreach 5C. One of the incoming conductors from the dropwire had come adrift and snapped.

Remade and everything stabilised, apart from DLM having slugged the line. 😞 

[Ripshod]

You're confusing line rate with your bandwidth. Yes, the line rate has dropped by 15Mbps but your actual speed (listed as "Attainable Net Data Rate") has only dropped by 4Mbps.

The former is the speed your modem syncs to the cabinet at. The latter is the speed you actually experience. 

No fault here. 

[f_250swb]

The attainable rate is calculated from from the available SNR, which is now sitting up at 12dB and the bitloading / QLN / amount of interleaving and a few other factors. It floats up and down and is only ever a guesstimate by the chipset. It's not a confusion. 

What you are describing is throughput. This is always less than the line rate, due to redundancy, checkbits and other overheads. This is now about 30Mbps and much lower than previously.