Power Off & DLM
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- Re: Power Off & DLM
Re: Power Off & DLM
01-06-2015 2:05 PM
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Quote from: alext05 We would care about the advice OR has given if we knew what it is. I am, for one, interested, but you seem to be unable to bring yourself to quote OR or to link to the original source (or your previous quote).
Openreach hold regular briefings on differing aspects of NGA. They have covered DLM in substantial depth as it's important that their customers, ISPs, are able to understand how and why it works. Chris Pettitt previously covered this for Plusnet and wrote an explanation as to how DLM works.
I cannot publish the documents and presentations for obvious reasons. I have written on another thread about the recent MTBR changes and how it impacts the 3 DLM profiles. Everything I wrote comes from how Openreach information is briefed to ISPs. There is another DLM workshop this month I believe and this will hopefully cover the 14 profiles in each speed band.
Re: Power Off & DLM
01-06-2015 2:49 PM
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A member of Plusnet staff has provided an advice in good faith too and it sounds sensible and simple, but obviously we don't know whether the advice is Openreach approved.
And since you are not willing to provide a better informed version of the advice, then we would be following the advice of the more helpful members of this community. At our own risk of course.
Re: Power Off & DLM
01-06-2015 3:13 PM
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I have in the past powered off and powered up the modem both quickly and as Anotherone suggested both times i lost Sync speed that never recovered the latest of which cut my up Sync in half, As i have a OR ECI modem I had no means of knowing what was going on, whether it was DLM related or something else, so I'm unsure what is the best way to do it as it effected me either way.
Re: Power Off & DLM
01-06-2015 3:18 PM
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Perhaps it would be easier if that other user explained his advice, what it is based on and link the empirical evidence?
As I said on this thread http://community.plus.net/forum/index.php/topic,139060.0.html the guidance is 30 secs.
@ Terranova667 - DLM reacts the day after, so if you lost sync speed the same day as a result of a reconnect it will DLM (equally unless a banded profile is applied, DLM will not be at play)
Re: Power Off & DLM
01-06-2015 3:33 PM
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Quote from: AndyH As I said on this thread http://community.plus.net/forum/index.php/topic,139060.0.html the guidance is 30 secs.
and as kitz told you on that thread the 30secs. is a red herring.
The absolute minimum should be 30 minutes, and the precautionary advice is 1 hour!!
I'll address some of your other remarks later.
I'll also pickup on some of the other useful comments
Re: Power Off & DLM
01-06-2015 3:38 PM
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It conflicts with Openreach information. I will see if I can post something else.
Re: Power Off & DLM
01-06-2015 3:59 PM
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I will take asbokid's & kitz advice and information way and above anything you have to say unless you can explain it and back it up without posting in such an abrupt "dictatorial" style.
Re: Power Off & DLM
01-06-2015 4:09 PM
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Back to the issue in hand - I cannot post the internal Openeach documents. If people don't believe me, then it's up to them but I am not going to bother helping people out if I am discredited without fair reason.
Re: Power Off & DLM
01-06-2015 6:13 PM
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On the link AndyH gave, Kitz stated.
"As far as the DLM is concerned then a resync in the same 15min period counts as a retrain and strike one for the forced event counter.
30 mins ensures at least one complete 15 min period and the sync to be classed as an unforced event so discounted by the DLM"
I'll be waiting 30 MINUTES + if I ever need to power cycle the modem.
ATB
SN
Re: Power Off & DLM
01-06-2015 6:40 PM
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Quote from: AndyH
As I said on this thread http://community.plus.net/forum/index.php/topic,139060.0.html the guidance is 30 secs.
Thanks a lot for providing a link to the original discussion. It has some interesting info.
Re: Power Off & DLM
01-06-2015 8:19 PM
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As a computer programmer with over three decades of experience I've seen (and written ) some stupid code but I'd like to think that whoever writes the DLM software would have the sense to ignore power cuts. After all there's nothing DLM can do to fix a dodgy power supply.
Re: Power Off & DLM
01-06-2015 9:06 PM
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Meanwhile, DLM does seem to pay attention to district-wide power cuts. If a large proportion of modems are affected around the same time, the problem gets classified in a way that is not detrimental to the individual line.
But for individual lines, no such thing happens.
I've recently been suffering from problems where the house RCCB has been tripping out, taking out everything in its path. When this first happened, with a few power failures over the course of a couple of days, DLM gradually fiddled with my line profile more and more - giving me altered G.INP settings (increasing the INP setting that was used for retransmission, and altering the FEC/interleaving settings used for non-retransmitted protection), then later the same weekend, it banded speeds down from 80/20 to 74/19. Things recovered reasonably quickly - over the course of a few days, rather than months - when the trips stopped. I normally have the modem stats being logged - and it would have been good to see the changes made. Unfortunately, all those power cuts made me reticent to leave the computer on logging all of the changes!
What I *can* say, from semi-vague recollection, is that it took quite a few power failures before DLM made any changes at all. But once it did, then each new failure caused a slight change to the profile.
We're still having periodic problems with the RCCB (it seems to happen with seriously rainy weather, so the previous batch was just after the election, with a new batch last night), but UPS's have fixed the impact to broadband and the computer.
Using FTTC since 2011. Currently on 80/20 Unlimited Fibre Extra.
Re: Power Off & DLM
01-06-2015 9:40 PM
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Part of the daily reported Openreach line data includes:
- Total 24hr Unforced Retrain Count
- Total 24hr Full Initialisations
- Total 24hr Failed Initialisations
Re: Power Off & DLM
02-06-2015 5:29 AM
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I reckon I was off for about an hour and I seem to have retained my normal ally restricted speed. I know I should have powered down the router first in the controlled manner described but with decorating on the go the big switch was easier and quicker.
Re: Power Off & DLM
02-06-2015 1:01 PM
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Quote from: Kremmen Next week I'm wallpapering and I'm going to have to turn the lecky off for a short period to get behind the wall socket that the modem is powered by.
Does the leaving it off for half hour minimum still apply to avoiding DLM issues?
You don't need to switch the electricity off, just to push a bit of wet paper behind the faceplate, provided you are a bit careful.
"In The Beginning Was The Word, And The Word Was Aardvark."
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