Thank you for your reply,

I'm not actually connected to a cab, or rather, I'm connected direct to the exchange which is over 4km away (I think an engineer once told me the cable length to exchange was about 4.5k). I've absolutely no idea what e-side is though, is it something I should mention to the next engineer I get over?

No cab = no E side

An E side is the pair between cabinet and exchange.

We can see the attenuations have fallen, as I suggested they would. Unfortunately however it is critical on ADSLx to sync as I said - well inside daylight hours. (The quality of the daylight doesn't really matter as long as there aren't thunderstorms anywhere around, miles either side of the line between you and the exchange).

At the time I posted I would have said it was a bit too late. Maybe between 10am and 4pm might be best. There is a lot more electromagnetic noise when the sun is lower against the horizons. For a more detailed explanation of that and how the SNR and SNRM work together at sync time see this page.

Don't do several re-syncs on any one line several times close together, particularly the Plusnet one. One or two tomorrow perhaps then leave things.

Although as has been posted a DLM can be requested by your ISP, one may have been done after the engineer's visit. If not, then it could be helpful in clearing DLM's history of the fault. But I wasn't aware a reset could include an immediate 3dB setting of the SNRM. That would seem odd to me.

Max attainable varies with the target SNRM setting Icaras. It relates to how far either side of that the current SNRM or SNR is (whichever one the modem looks at to calculate the presented figure - it amounts to much the same thing).

If the target SNRM is changed by DLM both sync and attainable move in the same direction, though not necessarily by the same amount.

You may be confusing this with the effect when the line reaches the product cap of 8128 or 24k on BTW ADSLx, where if the SNR is high then the SNRM rockets up along with the Attainable.

Just for clarity -

a �DLM reset� is a reset of FTTC settings, nearly always managed by the engineer requesting it via an app on their work phone.

an �SNR reset� is the done on BT Wholesale broadband ADSL products by the engineer using a system known as WOOSH.

The request of a �hard pinned� profile, so the circuit will have a fixed SNR target, is done on request via a call to BT Wholesale.....

All bets are off if referring to LLU broadband.

Thanks Zarjaz .

But are you saying a complete ADSLx DLM reset can�t be done on BT Wholesale DLM? Or just hat it can�t be triggered by an engineer. (Yes, I know none of this DLM stuff applies to LLU ADSLx but steered clear of that as we know this is a Plusnet line).

Is Icarus right in saying you can actually request a fixed 3dB though? That was my main doubt. I thought this was only used to fix it above 6dB to prevent flapping. Or was that before settings below 6dB were possible and now those can also be fixed?

I thought the max attainable was what the line could sync at if it was at 0 SNR - therefore whether you currently have 3dB SNR or 6dB SNR it would be irrelevant as it would calculate based on the current SNR level. I'm not convinced it changing to a 3dB would have a significant impact on the max attainable - I could of course be wrong...

I�m certainly right in respect of its behaviour on FTTC. I see it every time my target SNRM is adjusted, in either direction. I believe I�m right on BTW ADSLx but hard for me to prove these days.

I don�t remember us being too bothered about Attainable on ADSLx. Just more basic things like sync v attenuation + SNRM and the ring wire. Plus on long lines this choosing of ADSL/ADSL2 instead of 2+. In a few cases of course ADSL turned out to be best of the three, but ADSL2 was frequently the one to go for if your sync was below 4Mbps.

In reply to a post by ian72:

I thought the max attainable was what the line could sync at if it was at 0 SNR

Thinking deeper ... (and you mean SNRM of course].

If that is correct then on the once-upon-a-time minimum setting of 6dB on BTW the Attainable would always have been 1 Mbps to 2 Mbps higher than sync on ADSL Max and 1.4Mbps to 2.5Mbps Mbps on ADSL2+. (Give or take the on-going variances in SNR which on domestic modems we only inferred from the SNRM fluctuations). I don�t think they were.

An engineer with access to the correct systems can do a reset on BTw ADSL kit.

They can also request it via a phone call.

The reset will always wipe back to 6db interleaved.

I�ve never come across a hard pinned 3db target, only 6 and above, being used, as you say, to stop flapping.