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DLM reset request (ADSL2+)

Townman
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Registered: ‎22-08-2007

Re: DLM reset request (ADSL2+)

So ADSL sync is up but you cannot establish a PPP session? Can you check that the account settings in the router have not changed?

Will the router establish PPP with a forced connect? I’ve know routers disconnect and then need a kick to reconnect.

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Mardler
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Registered: ‎01-07-2012

Re: DLM reset request (ADSL2+)

With no internet I can't access the router. Same with all 3.

A few minutes ago there was an instantaneous reconnect and sync. It only lasted a few seconds but enough for me to grab a screenshot.

Mardler
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Re: DLM reset request (ADSL2+)

I managed to get into the router log for a few minutes and found the problem.

The login fail on my PN account required a password reset, a new requirement for a special character. I had to do that yesterday and forgot that the router uses the same info. Doh!

Trouble was I could visualise the router page I needed but couldn't find it in the router menu.

I set about reading the manual. Within seconds the phone rang. It was the lass* from PN looking at my disconnect problem.

We looked at a page or three to no avail then I spotted "Continue" at the foot of the DSL configuration page: it took me to what I wanted and with the password special character added up came the internet immediately.

The sync was good at 20+ but the SNR a bit low. It's already fallen a tad and will probably disconnect as dusk falls. We then see what happens over the next week or two.

*Lidia Duarte deserves full marks for her timely intervention both with the DLM and her call plus her approach which was exemplary. I would have got there reading the, huge, manual but Lidia saved me the time and between us we solved the issue so many thanks again.

Mardler
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Re: DLM reset request (ADSL2+)

PN: that accepted fix was a rogue so please undo it.

Edit: found the "undo".

Townman
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Re: DLM reset request (ADSL2+)

So where are you up to?

Have you had a fault on the line repaired? 20mbps sounds nearer the mark.

Can you please share the attenuation, DL sync speed and SNRM.

You said the SNRM is too low. If the DLM has been reset the target SNRM should be 6dB (3dB if the line is thought to be well above average). If it’s in between these figures, that suggests that there are noise issues.

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Mardler
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Re: DLM reset request (ADSL2+)

TM, no fault admitted so no repair.

Attainable rate now 21636, SNR 9.4 and sync 18243 up for 6:03:18. Attn is 16, SNR 9.5.

Ookla gives 15.7 down. Not the best but OK.

 

Mardler
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Re: DLM reset request (ADSL2+)

Apologies, TM, you mentioned the target SNR and while I gave the other stats I overlooked that. IIRC, it was set to 6db. SNR currently reported as 10.4 but that's an afternoon figure, the test comes at and after dusk - there was a disconnect c.17:30 yesterday as I expected but all was good after that.

No disconnects so far so we will see what happens tonight and over the next two weeks. 

Townman
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Re: DLM reset request (ADSL2+)

“Set to 6dB” is that in the router again?

Until you are sure that you are out of the woods I recommend that you do not attempt to “manage” the SNRM. I saw your response earlier but did not reply as I need to check if that sync speed is banded. Given the marked improvement a DLM reset might now be appropriate.

The elevated SNRM might by a characteristic of the line being banded - you’ve got that sync AND a good noise margin. Could yet see 22+mbps and a stable connection!

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Mardler
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Re: DLM reset request (ADSL2+)

No, DLM.

I made it clear above that the situation will be observed for the next two weeks.

I never had any intention of SNR tweaking while I had engaged a PN techie (I did and struck lucky) who would reset the line SNR to 6: remember, I have been here before many times. I have also received the line monitor chart which is very familiar, it shows multiple dropouts last Thursday none of which were anything to do with me.

A stable 22Mbps would be great but highly unlikely as I still suspect a line fault. Still an 18243 sync isn't too shabby. 

Townman
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Re: DLM reset request (ADSL2+)

OK, I am now back at the desk and can search for stuff far more easily.

That synch rate does not look to be banded, but there could be other factors in play still. which would be worth poking.  Does your router indicate the interleaving depth?

On your ticket history are there any reports as illustrated here - Broadband Faults Guide - Our Testing - Plusnet Community ?  Broadband Faults Guide - Banding Guide - Plusnet Community is also an interesting read.

If you do have test reports as illustrated above, do they advise of the target SNRM, banding and INP configuration?

 

A current SNRM significantly above the target SNRM suggests either...

  1. The sync rate is restricted (banded) and at that sync speed there is a much higher SNR margin
  2. At the time of the sync there was a high level of background noise and the target margin could only be attained at a throttled speed ... after that noise dissipates, a higher current margin is observed

Usually the DLM will reset the controls on the line should it become more stable, however if the banding is 'chronic' then an ISP reset is required.

 

@willcutforth - are there any residual faults showing on this users service and if not, is the service in anyway still restricted?  It seems odd that the 16dB attenuated line is only delivering 18.243mbps with a very healthy SNRM ... rather than the full potential 22mbps at 6dB (or more at 3dB).  Such hints at a residual fault or at a restriction.

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Mardler
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Re: DLM reset request (ADSL2+)

I don't think the router shows interleaving depth just off (0) or on (1). It's set to 1.

Thanks for the links, bedtime reading! The router only shows the actual SNR not the target.

I will come back tomorrow ITM the connection remains up with reported SNR = 9.0.

 

Mardler
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Re: DLM reset request (ADSL2+)

I read the stuff at the links, interesting so thanks TM.

I see none of that test info so will ask my contact. 

ITM, I watched the reported SNR fall steadily last night. At 23:27 it got to 5.4 then at 00:34 it jumped to 9.8. Right now it's 10.4. The connection remained stable (which it has been since the connection was dropped by the exchange 5 hours after PN reset the SNR).

Btw, I am fairly sure that the line isn't banded.

 

Townman
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Re: DLM reset request (ADSL2+)

That’s very interesting!!

This might be the fly you’ve been looking for - a nasty noise spike. It’s worth checking out router stats (link below) to see if it functions with your billion router.

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Mardler
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Registered: ‎01-07-2012

Re: DLM reset request (ADSL2+)

Certainly is!

I will check the stats link later, thanks.

Mardler
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Re: DLM reset request (ADSL2+)

In today's news, the overnight SNR update:-

18:10:04 sync still 18243 & attenuation 16 throughout no disconnects

19:05 fell to 5.4 from 9+ all day

20:55 8.9

23:06 5.5

00:44 9.8

Currently 10.4

It seems that the DLM ups the SNR as soon as a decrease to c.5.4/5.5 is detected while retaining sync. If that's the case there's no point in SNR tweaking now, I will however, pursue why the full short line potential isn't being achieved.

NB "interleaver depth"* = 1 means that data is being transmitted over the interleaved path but data packets are not being interleaved. ie the equivalent of Fast Path. (Kitz. Also says a few routers can change it, the 7800DXL can't)

*Billion's description

I expect this SNR behaviour to continue (it probably has in the past with months long stable connections, I just wasn't looking) so unless something dramatic happens I won't clutter the topic further on this.