topic Re: DLM reset request in Broadband

DLM reset request

Pnnoakes — Sat, 27 Jan 2024 21:01:26 GMT

Hi, following a couple of recent power cuts in the area my sync speed appears to be capped at 35mb. Attainable speed around 44mb. Can I get a line reset please to get me back to previous speed levels?

Re: DLM reset request

MatthewWheeler — Sun, 28 Jan 2024 15:34:18 GMT

Hi @Pnnoakes

Your current DLM profile is "0.128M-40M Downstream, Retransmission Low - 0.128M-20M Upstream, Error Protection Off" so it's unlikely to be solely DLM at fault as your sync speed would be closer to 40Mbps.

How do you have things setup at the moment?

Re: DLM reset request

Pnnoakes — Sun, 28 Jan 2024 18:32:16 GMT

Hi. Set up is a 3rd party router (Billion BIPAC 8800NL R2) which has been in place for many years. So no physical changes. Previous to contract renewal I was syncing at 44mb (measured at the router interface xdsl stats page), post renewal for some reason this seemed to be limited to 40mb as per your reply. Since the recent power cuts the sync is now at 34999kb and despite restarts, it always syncs at this speed, whilst attainable rate varies between 42-44mb. So in summary, nothing has changed in the set up, which has been the same for more than 2 years. I had a similar problem about a year ago and a line reset immediately brought the sync speed back to 44mb.

Re: DLM reset request

James30 — Wed, 31 Jan 2024 12:31:53 GMT

Hi, something must have changed somewhere shown below;

In your house - You said there are no changes.

Eternally with the network - Coincidence by possible.

DLM - I am unsure of the full working but I presume it will manage the sync rate with settings other than the speed profile(banding) like SNR perhaps after the reboot, it thinks the lower sync rate is better.

As your sync rate is lower than the minimum of 36.2Mbps for either of these issues we could do with raising a fault. First, to be sure of no internal issues could you send some pics of the back of the router and phone socket please?

Re: DLM reset request

jab1 — Wed, 31 Jan 2024 13:06:53 GMT

I might be looking at this totally wrong, but the profile quoted by @MatthewWheeler above looks wrong - 40/20? - not possible!

Re: DLM reset request

James30 — Wed, 31 Jan 2024 13:30:43 GMT

@jab1 - The line is banded at 40Mbps but this isn't impacting the customer as his sync is less than the 40Mbps banding. I've checked the provisioned speed and it is 80/20 confirming the 0.128M-40M is banding

Re: DLM reset request

jab1 — Wed, 31 Jan 2024 13:33:22 GMT

Cheers, @James30 . So we need to establish why it is banded? I'll not comment further until some checks have been done.

Re: DLM reset request

Pnnoakes — Wed, 31 Jan 2024 18:20:00 GMT

Thanks for your reply. I’ve attached photos of the master socket and router back as requested. I’ve also included screen shots of the xdsl stats page and two pages of speed test history. Clearly I can’t attest to any changes at the exchange or street box, but nothing has changed internally.

Reading the replies, I would query why the line is banded at 40mb, when the Speedtest results show I have previously achieved higher sync speeds. (The Speedtest results are via a iPhone 14 pro over wireless and generally return a figure 10% below the actual sync rate at the router). Having recorded 39/40mb Speedtest results last year, this evidences a true sync speed nearer 44mb.

The xdsl page today shows 34999kb and any attempt to restart the router reverts to this exact same sync speed, so this suggests to me it is being actively managed somewhere to that exact rate.

Prior speedtest resultsXDSL stats page from routerSpeedtest showing recent drop in rateRouter imageMaster socketIn summary, last year I was getting 44mb sync speeds. Now I appear to be limited to 35.9mb. I renewed a contract based on prior performance and I’m no longer getting it, so you can understand the frustration. Thanks again for continued help to resolve this.

Re: DLM reset request

jab1 — Wed, 31 Jan 2024 18:28:03 GMT

@Pnnoakes There is nothing wrong with your connections, but I note your downstream SNR in that screenshot is 9.3dB - high, and suggestive of an error state somewhere, which is why you are banded.

I suspect you don't have /don't use a landline phone?

Re: DLM reset request

Pnnoakes — Wed, 31 Jan 2024 19:14:46 GMT

Hi, you are correct, the landline phone is disconnected as we don’t use it. Can this cause as issue?

Re: DLM reset request

jab1 — Wed, 31 Jan 2024 19:19:24 GMT

No, it won't, but if you have a handset, indulge me please - plug it in and run the Quiet Line test - dial 17070, select option 2. There should be no noise after your number is confirmed, other than the regular 'Quiet Line Test'' message. If there is, report a phone fault.

Re: DLM reset request

Pnnoakes — Wed, 31 Jan 2024 19:46:48 GMT

Definitely some noise there. I’ll report it as suggested. Many thanks.

Re: DLM reset request

RealAleMadrid — Wed, 31 Jan 2024 19:47:21 GMT

@jab1 In my opinion it seems perfectly obvious that despite what Plusnet have said the line is banded at 35Mbps giving the high SNRM figure.

@Pnnoakes If you are restarting the router and the sync speed is always the same that confirms that the line is banded, there have been cases similar to yours in the past because one the diagnostic tools that Plusnet use does not actually show the current profile but one that is a couple of weeks out of date.

@MatthewWheeler Can you confirm the current line profile because 40/20 doesn't look correct.

Re: DLM reset request

jab1 — Wed, 31 Jan 2024 19:49:09 GMT

That more than likely will solve it, but it may take a while for DLM system to react, although you should be able to request a reset when the problem is solved.

Re: DLM reset request

jab1 — Wed, 31 Jan 2024 19:50:39 GMT

@RealAleMadrid wrote:

@jab1 In my opinion it seems perfectly obvious that despite what Plusnet have said the line is banded at 35Mbps giving the high SNRM figure.

@RealAleMadrid - see the OPs response just above. 😉

Re: DLM reset request

RealAleMadrid — Wed, 31 Jan 2024 19:54:23 GMT

@jab1 I was just pointing out that the line is being restricted by banding despite Plusnet saying it isn't. If there is a line noise problem that needs to be looked at first.

Re: DLM reset request

jab1 — Wed, 31 Jan 2024 20:06:31 GMT

@RealAleMadrid Understood - but this has only just been confirmed - I’m just surprised nobody had thought to check.

Re: DLM reset request

Pnnoakes — Wed, 31 Jan 2024 20:16:51 GMT

Initial line check has found no fault. I’ll have to wait now till tomorrow for the advisor call to take this further. Thanks everyone for assistance so far.

Re: DLM reset request

jab1 — Wed, 31 Jan 2024 20:19:20 GMT

The autobot doesn't pick all faults up, but if there is noise on the line, there is definitely a fault - don't let them tell you otherwise.

Re: DLM reset request

Pnnoakes — Wed, 31 Jan 2024 20:35:37 GMT

Thanks @jab1. I’ll update tomorrow after the advisor call.