Does Sky Have a 6db SNR Standard Now?

[DMViolator]

So the training is done then.  Am I stuck on 24 then? Even 31 was marginally acceptable.

[jamesn123]

@DMViolator 

With a line length like that you more than likely have excessive noise or increased errors which would stop DLM from bringing you down to the 3dB margin. What you have is likely the best you'll get

[Mr+Slant]

The "10 day training" is nonsense really. Always has been on anything other than Sky's unbundled ADSL services where you'd start off slow and get faster as they tested your line.

On VDSL you get max sync on day 1 and then it'll either stay there or drop down a bit as Openreach's DLM kicks in. This normally results in a desync/resync in the early hours and has nothing to do with Sky.

If your line is decent (not too long, no cross-talk disturbers in the cable bundle next to you etc) then you may get a reduction in noise margin from 6dB to 3dB. This won't happen inside the "10 day training" nonsense Sky say because Sky have zero control over Openreach DLM (other than selecting the default DLM level they use).

To me your line looks like a long connection with multiple disturbers (x-talk) and its probably as good as it's going to get. If your line was capable of 40Mbps+ I'd expect you to be getting a 10Mbps upstream sync.

Depending on your location (and Sky contract) you may do better with a 4G/5G wireless connection.

[jamesn123]

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@Mr+Slant wrote:

On VDSL you get max sync on day 1 and then it'll either stay there or drop down a bit as Openreach's DLM kicks in. This normally results in a desync/resync in the early hours and has nothing to do with Sky.

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Thats simply not true, at least for Sky lines. I've witnessed mulitple lines start at 6dB upon provision and go down to 3dB after around 3 days or so. 

[Mr+Slant]

Then the line is perfect.

Openreach's DLM (which Sky have NO control over) does not respond that way on the majority of lines.

Either way its nothing to do with the "10 day training" which is what happened on unbundled Sky ADSL.

[jamesn123]

@Mr+Slant 

Whether or not its a 10 day training period can indeed be debated but lines do take time to optimise with DLM, some may start at 6 and go to 3 or vice versa, this process takes days therefore can still be considered a training period. 

[Mr+Slant]

@jamesn123 

Yes but the 10 day training period dates from 15 years ago and is specific to unbundled Sky ADSL

No ifs or buts about that - I was there back in the day 🙂

Sky quoting it now is misleading to say the least as there is NO "10 day training period" on Openreach DLM systems. None.

[jamesn123]

@Mr+Slant 
Dont dispute that but its easier for Sky to tell non-teckie people that they need to wait a '10 day training period' rather than saying you need to wait a week or so for Openreach DLM to optimise your line's noise margin for the best speed possible. 

[Mr+Slant]

That's what they said a decade ago. Doesn't make it true.

Truth is they train first line staff for ADSL/VDSL/FTTP the same and given ALL Sky ADSL is via their own MSANs (which do the 10 day training; nothing else Sky provides does) its easier to tell them the same story in training.

Nonsense is nonsense matey. End of.

[DMViolator]

Thanks, that's what I'm starting to think too.  Disconnected and reconnected the line, and it's back to 31 now, with about 7.5 up.

Have to live with it, I guess, as the alternative are utter (removed)

Moderator comments: removed inappropriate language

[Mr+Slant]

I assume you've plugged the router into the "test socket" behind the faceplate and left it there for a few days to see if anything changes? The Openreach DLM system will normally resync between 2-4am - up or down.

Also you might want to try viewing the stats page on the router with a very low refresh time (1-2secs) and try calling your landline from a mobile. If the SNR changes appreciably (more than a dB or two) while its "ringing" then that usually indicates an issue on a joint (connection) somewhere on the D-side (from the cab to you) of your landline.

Also running a quiet line test (dial 17070) then option 2 might assist.

If you hear ANY noise on the landline then report it as a VOICE fault, not broadband. This is important in terms of the Openreach engineer who will be assigned to check it.

HTH...