topic Re: DLM not working on new connection in Broadband

DLM not working on new connection

aga84 — Fri, 17 Dec 2021 09:40:45 GMT

Hi there,

My Fibre 65 connection went live on 06 December after being transferred from PlusNet, and ever since then DLM has not kicked in to drop my downstream SnR margin from 18dB to 3dB like it has been for over 5 years. This means that I've lost ~5mbit of my downstream speed.

I am using the same cables and microfilter as I was using with PlusNet, but I am now using TalkTalk's Huawei DG8041W router.

Is there a way to get DLM to kick in? I restarted the router yesterday after 7 days of uptime

and it made no difference.

Thanks.

Re: DLM not working on new connection

Anonymous — Fri, 17 Dec 2021 09:43:52 GMT

Morning,

Can you please update your community profile to include your:

Name

Telephone number

Alternative contact number

We'll then look into this further. Please do not post this information on this thread. Once you've updated your profile please post in your topic to confirm it's updated.

Thanks

Re: DLM not working on new connection

aga84 — Fri, 17 Dec 2021 09:45:49 GMT

Thanks Michelle. I've just updated my details.

Re: DLM not working on new connection

martswain — Fri, 17 Dec 2021 09:48:05 GMT

@aga84 you are looking at the WRONG figure !

What you have highlighted is the ATTENUATION, the amount of LOSS on your line.

Your downstream noise safety coefficient = Noise Margin and IT IS 3 dB.

You've had a bit of a Homer Simpson moment, d'oh !

Re: DLM not working on new connection

aga84 — Fri, 17 Dec 2021 09:49:33 GMT

That is indeed a "d'oh!" moment! However, it doesn't really change the fact that my line is 4-5mbit slower than it was with Plusnet 11 days ago and nothing has changed apart from transferring the service to TalkTalk and switching to their supplied Huawei router.

Re: DLM not working on new connection

Anonymous — Fri, 17 Dec 2021 09:53:13 GMT

Hi,

I've run a test on the line now which is clear. What speeds were you seeing with your previous provider? Does your main socket have a test socket? If it does then if possible please can you connect the microfilter, router and phone at the test socket for at least 48hrs so we can see if DLM makes any changes to the speed.

Thanks

Re: DLM not working on new connection

aga84 — Fri, 17 Dec 2021 09:55:38 GMT

Thanks Michelle. The upload speed is the same, however my download speed was about 48.5mbit (it used to be about 52mbit a few years ago but I think crosstalk has affected things).

I can move the phone line to the test socket, but it won't be until this evening as there are two people working from home on this line at the moment.

Re: DLM not working on new connection

Anonymous — Fri, 17 Dec 2021 09:57:55 GMT

Hi,

No problem, no rush. We can then check back in with you on Monday if that's ok to see how the speeds compare?

Thanks 🙂

Re: DLM not working on new connection

aga84 — Fri, 17 Dec 2021 10:10:52 GMT

That's perfect, thanks!

Re: DLM not working on new connection

Anonymous — Fri, 17 Dec 2021 10:13:18 GMT

Hello,

Great thank you and I will check back in on Monday 🙂

Thanks

Re: DLM not working on new connection

AllyM — Fri, 17 Dec 2021 19:42:18 GMT

@aga84 wrote:
That is indeed a "d'oh!" moment! However, it doesn't really change the fact that my line is 4-5mbit slower than it was with Plusnet 11 days ago and nothing has changed apart from transferring the service to TalkTalk and switching to their supplied Huawei router.

As I understand it, there are 3 "stability" profiles which ISPs can specify the Openreach DLM uses to manage the line:

Speed (optimised for fastest speed over stability)
Standard
Stable (for maximum stability over speed)

I believe that almost all ISPs use one of the first two options, but they don't seem keen to publish that information.

I believe TalkTalk use the slower "standard" profile. I would guess that Plusnet use the fastest "speed" profile (as their parent company BT do) which would account for the difference in speed on your line.

Re: DLM not working on new connection

Anonymous — Mon, 20 Dec 2021 06:51:57 GMT

Morning,

I've re-checked the connection stats now and the sync speed has only increased ever so slightly. Can I just confirm, were you provided with a predicted speed range for the line?

Thanks

Re: DLM not working on new connection

aga84 — Mon, 20 Dec 2021 09:08:06 GMT

Hi Michelle,

Thanks for following up so early. Like you said, moving the phoneline to test socket has had a very minimal impact. I don't think DLM has done anything since the connection has an uptime of almost 50 hours. I had a look through the emails I received when I signed up for Fibre 65 and I can't see any mention of predicted speeds.

I was with TalkTalk about 2 years ago at the same address and I definitely got a better downstream line rate. Seems like something has changed since then.

Re: DLM not working on new connection

Anonymous — Mon, 20 Dec 2021 09:44:52 GMT

Hello,

Ok, do you have an alternative router that you could try please?

Thanks

Re: DLM not working on new connection

aga84 — Mon, 20 Dec 2021 11:54:42 GMT

Yeah I have a TP-Link W9970 modem/router that I can try.

Re: DLM not working on new connection

Anonymous — Mon, 20 Dec 2021 12:19:04 GMT

Hi,

Ok thanks for confirming. Please let us know once this router is connected and we can re-check the connection stat again.

Thanks

Re: DLM not working on new connection

aga84 — Mon, 20 Dec 2021 13:16:29 GMT

Switching back to the TP-Link W9970 solved the problem. Seems like the modem in TalkTalk's Huawei router isn't as good, although the W9970 is pretty rubbish as a router since the CPU is so slow. Fortunately it supports bridge mode.

Thanks for your assistance!

Re: DLM not working on new connection

Debbie-TalkTalk — Mon, 20 Dec 2021 13:23:52 GMT

Hi aga84

Thanks for your reply.

Would you like me to send a Sagemcom WIFI hub for testing to see how the connection compares?

Re: DLM not working on new connection

aga84 — Mon, 20 Dec 2021 13:28:15 GMT

Hi Debbie,

That would be really appreciated, thanks!

Re: DLM not working on new connection

Debbie-TalkTalk — Mon, 20 Dec 2021 13:35:31 GMT

Hi aga84

No problem 🙂

The router is on its way, please allow 24-48hrs for this to arrive.

Let us know how the connection compares with this router.

Thanks

Debbie