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Author Topic: xdb profiles  (Read 1807 times)

twinkletoes

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xdb profiles
« on: July 07, 2018, 09:56:32 PM »

Hi Kitzens,

Just wondering how long it takes before the SNR profiles start to lower? I had a 3.4db SNRm before when I was on the BTW network with uno, but ever since swapping to the TTB network with them in January 2018, the OR DLM refuses to try the lower xdb profiles. I have been on a 6.3 (give or take 0.2 in that value) DS SNRm, just find it odd that my line was perfectly fine on a 3.xdb SNRm giving me the full 80/20 sync speeds.

I have had a DLM reset performed yesterday, so I'll keep an eye on my line and see what happens.

Thanks for any advice.

Steve
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Ronski

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Re: xdb profiles
« Reply #1 on: July 07, 2018, 10:30:13 PM »

Roseway switched provider recently and his took 10 days to get back  to 3dB, but it does vary, my brothers line took much longer.
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andyfitter

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Re: xdb profiles
« Reply #2 on: July 07, 2018, 11:03:31 PM »

Don’t hold your breath. I’ve been waiting since Christmas for xdB on a line that will comfortably support it. Also took 3 months to get g.inp reapplied.
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twinkletoes

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Re: xdb profiles
« Reply #3 on: July 07, 2018, 11:35:37 PM »

Thanks for the replies :) I got G.INP applied on the DS within 7 days when I swapped over, so that was pretty good! Also a few days ago I had G.INP on the US for about 24hrs before the DLM decided to turn it off again. It was nice seeing 0 ES on both DS/US. DLM is a mysterious thing in the way it works! :D

Steve
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spring

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Re: xdb profiles
« Reply #4 on: July 08, 2018, 02:01:12 PM »

well upstream G.INP isn't applied unless there are errors, whether or not the DLM is behaving according to your needs is a case of luck

One of the things we noticed is that rather than the usual INP 3, the INP value would be somewhere in the 40-50 region. (which we would expect for G.INP).   It became unbundantly clear during G.INP mk1 that there were far more 'incompatible' modems in use than Openreach anticipated, so they did a botch job by only applying G.INP/INP on the upstream for lines that needed it for stability... and at the same time changing downstream to have INP applied first by default then G.INP at a later date.
« Last Edit: July 08, 2018, 02:07:29 PM by spring »
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andyfitter

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Re: xdb profiles
« Reply #5 on: July 08, 2018, 02:26:07 PM »

well upstream G.INP isn't applied unless there are errors, whether or not the DLM is behaving according to your needs is a case of luck

I’m not sure that explains everything in terms of upstream g.inp. I’ve had around 8 dlm resets over the past 4 years. 4 through changing supplier and 4 through faults. After each reset it is a variable amount of time for downstream  g.inp to come back, but every single time I get g.inp downstream, around a week later I get 1 or 2 days of g.inp upstream, but every time it is taken away again. It isn’t brought on by errors, it seems as if dlm just gives it a try to see if it makes things ‘better’ in some way that dlm quantifies. After it goes away it restores the upstream back to the same parameters as previously applied.
« Last Edit: July 08, 2018, 02:28:15 PM by andyfitter »
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spring

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Re: xdb profiles
« Reply #6 on: July 08, 2018, 03:06:23 PM »

well for OP errors were relevant, your experience explains why DLM didn't really decide turning it on, just probing it
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j0hn

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Re: xdb profiles
« Reply #7 on: July 08, 2018, 04:18:49 PM »

I'm my experience DLM applies upstream G.INP after a period of increased upstream ES. Most of the time it removes after a few days.
Some noisier lines keep upstream G.INP all the time.

For the OP, the majority of the time G.INP is applied within a few days of a ISP switch. The target SNRM (xdB) is usually lowered within a few days of that.
If it isn't lowered in the 1st week then it can take months/never/who knows before it might try it.

A DLM reset usually triggers the whole routine to start again and the target SNRM would likely be lowered in the first week.
Getting an ISP to arrange a DLM reset because the SNRM hasn't been lowered is probably a no go though.
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