topic Re: DLM Reset in Broadband

DLM Reset

selector14 — Sat, 22 Feb 2025 20:02:23 GMT

My connection drops regularly overnight, probably once a week. I live in an area that is notorious for faults and poor cabling but have had multiple engineers saying there's nothing they can do.

They also enabled interleaving on their most recent visit but doesn't seemed to have helped, only makes the speeds drop further.

My sync speed on the router has now dropped to 13mbps. Would appreciate a DLM reset please.

Thanks

Re: DLM Reset

outcast — Sat, 22 Feb 2025 21:00:52 GMT

Do your ongoing line faults often cause your sync speed to drop, or is this a one off reduced speed problem ?

I'm just wondering whether along with a DLM reset, you ask Plusnet to change the "stability profile" of your line to a more stable setting ?. Rather than repeat what I've written about this, look at this post where I describe the various settings.

Re: DLM Reset

selector14 — Sun, 23 Feb 2025 10:34:48 GMT

Yeah I've noticed the speed will continually drop over a period of time.

Re: DLM Reset

Marsh — Mon, 24 Feb 2025 09:50:24 GMT

Hey @selector14,

I am sorry to hear that the engineer could not help on your most recent visit I have ran some tests on the line while they did not show any faults affecting the Openreach line I have done the DLM reset which takes up to 30 to complete

Re: DLM Reset

selector14 — Mon, 24 Feb 2025 12:12:29 GMT

Hi @Marsh,

Thanks for the DLM reset,

Would you recommend a change of stability profile to standard so it's less aggressive on speed?
Or would my speed still drop regardless?

Thanks

Re: DLM Reset

LexLex2020 — Tue, 25 Feb 2025 17:55:28 GMT

Hi @selector14,

We can certainly try it for nothing, Ill place the order for it and we can monitor.

If you get an intermittent connection or drops on your BB then we will probably need to move it back over to stable but we will just have to see.

The order will complete tomorrow, so I would give it around 5 days to see if the speeds change and if drops occur.

Please let us know!

Lex

Re: DLM Reset

selector14 — Thu, 27 Feb 2025 20:41:06 GMT

Hi @LexLex2020,

Thanks very much.

I will keep an eye on it and update with any issues.

Thanks again.

Re: DLM Reset

selector14 — Sun, 23 Mar 2025 11:22:37 GMT

Hi @Marsh @LexLex2020

Just to keep you updated. Unfortunately I have had no change in speed and my sync speed is still capped to 13mbps.

Thanks

Re: DLM Reset

Windings — Sun, 23 Mar 2025 16:26:18 GMT

Hi @selector14

It seems that your stability profile is still set to stable and hasn't been reverted to standard, would you like me to revert this stability order back to standard for you so we can test the speeds?

Regards

Re: DLM Reset

selector14 — Sun, 23 Mar 2025 17:01:14 GMT

Hi @Windings

With my current speeds the internet is noticeably slow.

I'd be happy to go with whatever you suggest would be best. If you think standard would help I'd be more than happy to try it.

Thanks

Re: DLM Reset

Marsh — Sun, 23 Mar 2025 18:33:23 GMT

Hey @selector14,

I have placed the order to change it too 'Standard' this should complete within 1-2 working days.

Re: DLM Reset

selector14 — Tue, 01 Apr 2025 18:09:40 GMT

Hi @Windings @Marsh

Could you advise whether any change has been implemented yet as I have still had no change in speed.

Thanks

Re: DLM Reset

Windings — Wed, 02 Apr 2025 15:20:27 GMT

Hi @selector14, Just had a quick check on your account for you and can confirm the modify to standard order has definitely completed. The only other thing i can do is trigger another DLM reset. Its a longshot but maybe the SNR margins didn't change in line with the modify order.

Ultimately if the reset doesn't prove to be fruitful, I'm not sure what else we could do.

Regards

Re: DLM Reset

jab1 — Wed, 02 Apr 2025 15:29:59 GMT

'@selector14 / @Windings - reboot Hub? might not work, but it is one thing I always try - any changes on anything that don't take sometimes need an unofficial 'kick'.😀

Re: DLM Reset

Gandalf — Wed, 02 Apr 2025 15:49:55 GMT

I think it's worth noting that changing the stability profile would just alter the parameters which DLM uses when making adjustments, so these type of changes aren't instant. I'd actually advise against rebooting the hub and keeping the connection as stable as possible to try to 'prove' to DLM that the connection can tolerate a higher speed. Even though another DLM reset will induce a drop, it may actually be beneficial as it will trigger a re-train and encourage it to make an adjustment quicker.

Having said that, I've tested the line and I can see the sync speed has now increased to ~37mbps, although it's also flagged a number of errored seconds, which could affect throughput, so may need pursuing as a fault (this wasn't showing on a test done earlier today, so I suspect it's likely the higher sync speed has triggered the errors).

Re: DLM Reset

jab1 — Wed, 02 Apr 2025 15:56:12 GMT

@Gandalf OK, hadn't thought of that - so, @selector14 - ignore my post above.

Re: DLM Reset

selector14 — Wed, 02 Apr 2025 17:16:46 GMT

Hi @Gandalf

Thanks, I have definitely noticed an increase in speed. As you have said its now showing as 37mbps sync speed.

I haven't restarted the hub at all. I'll let it do it's thing.

So do I just monitor it for now and see how it goes? as you say the errors may be due to speed rather than an actual fault?

Thanks again

Re: DLM Reset

Gandalf — Wed, 02 Apr 2025 19:51:27 GMT

Yeah I think the line is generating errors due to the higher speed, but could only be a matter of time before it falls over itself and things starts slowing down again.

Imagine it like a bumpy road, we’ve forced the ‘car’ to go fast, but the bumps are still there, so the tyres eventually break and it slows down (there were no errors at the slower sync, so couldn’t have known this previously).

Assuming the errors persist, I reckon it’s indicative of an underlying issue with the line that should be further investigated by an engineer. Although appreciate you’ve had quite a few engineers out previously.

Silver lining is that it’s generally easier to diagnose an issue if the connection’s behaving poorly, so the errors may just be what an engineer needs to sort it, although granted I wasn’t close to the previous investigation.

You could try re-reporting the issue by text here: https://www.plus.net/help/report-a-problem/ and see what happens. Keep us posted on how you get on.

Re: DLM Reset

selector14 — Sun, 13 Apr 2025 16:46:29 GMT

Hi @Gandalf

Just an update.

I haven't reported an issue, maybe I should of (although the text reporting doesn't seem to work for me).

The speed has been slowly decreasing, now currently sitting at around 27mbps.

Thanks

Re: DLM Reset

Marsh — Mon, 14 Apr 2025 17:30:02 GMT

Hey @selector14,

I've been reviewing the line speeds, and as you mentioned, they are currently decreasing again. If you’re available for a quick call, I have sent you a DM please reply with a suitable time I would like to go over some checks with you to see if there’s anything we can do to improve the speeds. If we are unable to resolve the issue, I would like to explore the possibility of bringing in another engineer. I understand that you’ve had several before, but it has been a while since we last addressed this.