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[Alex Atkin UK]

Curious, I've never seen a delay more than 8ms each way.

[cbdeakin]

I suppose I'm lucky in a way that the line is only a few hundred meters, as this helps to keep the total latency down (getting latencies between 30-40ms in Stadia, which is considered 'good').

[Alex Atkin UK]

Not sure distance makes a difference on VDSL other than a higher chance of interference along the line, the mechanisms for mitigating it remain the same either way and that's where the majority of the latency comes from.

[cbdeakin]

So, the interleaving got removed on the upstream about an hour ago and the additional delay is just 8ms now.

hopefully it won't be completely crap again, but I won't hold my breath. My ISP said it would remain active, but it still seems to be controlled dynamically by Openreach.

EDIT - Yup, just started a Stadia stream and it's losing thousands of packets again in just 4-5 minutes, and the stream feels glitchy again. So, it seems to need the upstream interleaving to be enabled... Very specific problem.

[tubaman]

I don't know how you are going to get around this as DLM is an automated process. I'm actually surprised that the engineer could manually apply interleaving - unless they actually just did a DLM reset which I believe applies it by default on an ECI cabinet, and DLM has now decided the upstream side is good enough not to need it?

[cbdeakin]

Yes, the DLM system is hardly a precision tool (doesn't care if the line is copper or aluminium).... I couldn't resist the opportunity for a pointless moan 

I don't think it was a line reset, the Openreach engineer specifically requested applying (only) upstream interleaving. I think they just applied standard interleaving on both the downstream and upstream.

I've certainly given my ISP a challenge.

[Chrysalis]

Doesnt make sense to me unless a piece of your networking equipment is generating noise when active, powerline networking or something else.

But you have a resolution which is the main thing.

[cbdeakin]

Well, from what I've heard, aluminium cables are prone to noise /interference so I assume that's the cause.

[Alex Atkin UK]

I don't think it was a line reset, the Openreach engineer specifically requested applying (only) upstream interleaving. I think they just applied standard interleaving on both the downstream and upstream.

Like we've said though, NOBODY has the ability to do this, its entirely down to DLM to decide interleaving or not, it cannot be manually overridden.

The only options you have are stability profiles (how many errors DLM will ignore before turning on interleaving and how aggressive it is) or a DLM reset.

[tubaman]

Like we've said though, NOBODY has the ability to do this, its entirely down to DLM to decide interleaving or not, it cannot be manually overridden.

The only options you have are stability profiles (how many errors DLM will ignore before turning on interleaving and how aggressive it is) or a DLM reset.

That's my understanding too - I think a DLM reset was performed.

[g3uiss]

Well, from what I've heard, aluminium cables are prone to noise /interference so I assume that's the cause.

Aluminium doesn’t carry higher frequencies well and loss per Meter is greater. I don’t think however it’s more prone to interference.

[Reformed]

Indeed. The killer is when aluminium and copper are jointed - it creates an impedance mismatch and you end up with literal signal reflections increasing noise.

[cbdeakin]

The engineer specifically made a request remotely to change the interleaving. The tech support lady answered on the other end to confirm the interleaving changes.

The other line stats remained the same after the change. Surely no need to debate that?

The options discussed were interleaving and interleaving high. I've no idea what difference there is between these.

The problem I have at the moment, is my ISP is currently having trouble getting in touch with Openreach via their 'portal'.

[Alex Atkin UK]

The engineer specifically made a request remotely to change the interleaving. The tech support lady answered on the other end to confirm the interleaving changes.

The other line stats remained the same after the change. Surely no need to debate that?

We debate it because all evidence suggests this is impossible, the engineer at best can request a DLM reset and in general its down to the ISP.  Only the ISP can request profile changes and AFAIK none of them guarantees interleaving, though as mentioned a DLM or profile change might enable interleaving by default but nothing to stop DLM turning it off again.  Interleaving is entirely down to DLM, it cannot be manually changed.

[cbdeakin]

You might be right. It's certainly seems like new territory for my ISP.