topic Re: Line Speed keeps dropping in Broadband

Line Speed keeps dropping

UKAussieP — Sat, 17 May 2025 21:26:23 GMT

Hi there

Seeking help from Plusnet. My internet line speed and subsequently internet speed keeps dropping. Last year I was getting 73Mbps, now I am down to 54Mbps (Speedtest.net). Please see the following 3 attachments.

Hopefully someone can help/advise.

Many thanks

Re: Line Speed keeps dropping

Tina11192 — Mon, 19 May 2025 14:45:47 GMT

@UKAussieP Thank you for taking my call this afternoon, I will contact you back at the agreed time later on today.

Re: Line Speed keeps dropping

UKAussieP — Tue, 27 May 2025 10:32:04 GMT

Hi there

I've just had a Plusnet engineer visit. She did a rewire of the socket, which increased my speed by a couple of Mbps, so we are now up to 57Mbps from 54Mbps - She is recommending a reset of the DLM. Can this please be arranged.

However I have also noticed that my SNR Margin is now dropped to 4.0dB. When I made my first post on the forums, it was 5.3dB - so something is still going on.

Hope you can still help.

Cheers.

Re: Line Speed keeps dropping

UKAussieP — Tue, 27 May 2025 10:56:46 GMT

Adding Screenshot - Current Line Stats.

Re: Line Speed keeps dropping

Marsh — Tue, 27 May 2025 13:33:12 GMT

Hey @UKAussieP,

I have run a line test to check if there are any faults after the visit, and everything is looking good on the line side; however, we can certainly do a DLM reset, but we would need to monitor for the connection for a couple of days to see if any improvements have been made I have done the reset for you now.

Re: Line Speed keeps dropping

UKAussieP — Tue, 27 May 2025 13:45:03 GMT

Many thanks !

Re: Line Speed keeps dropping

UKAussieP — Wed, 28 May 2025 08:16:49 GMT

Posting todays stats: SNR at 6.1 (great). But speeds still slow (54-55Mbps), barely changed since the beginning. Upload has gone down from 14.5Mbps to 11.5Mbps since yesterday.

Re: Line Speed keeps dropping

Windings — Wed, 28 May 2025 13:29:13 GMT

@UKAussieP Your SNR margins aswell as your download/upload speeds will fluctuate over a 10 day stabilisation period when we submit for a DLM reset.

Keep an eye on it and ultimately, at the end of the 10 day period if nothing has changed, we may have to look into a different fix for you.

All the best

Re: Line Speed keeps dropping

UKAussieP — Thu, 29 May 2025 08:55:50 GMT

Hiya

Just posting to say, there has been no change in the past 24 hours - for better or worse.

Cheers

Re: Line Speed keeps dropping

UKAussieP — Tue, 03 Jun 2025 10:15:45 GMT

Hi PlusNet

I am still experiencing slower internet speeds than I should be getting. Can you please investigate why my speeds have dropped over the last few months (since March 2025, I think). Maybe arrange an Openreach Engineer to investigate/resolve.

Ive attached the lasted screenshots for information.

Cheers

Re: Line Speed keeps dropping

lahbrannan1 — Tue, 03 Jun 2025 14:50:25 GMT

I am sorry to hear you are experiencing issues with the speeds of your broadband service. I have carried out a diagnostics test and determined there to be no fault with the internal socket nor the external infrastructure nevertheless that does not rule out the possibility of there been a WIFI or router issue.

Please could you advise if an appropiate time to get in touch so we can discuss further, alternatively please feel free to reach out to the support team on 0330 123 9123, lines are open Monday to Sunday 8am to 8pm.

Thanks

Lee

Re: Line Speed keeps dropping

UKAussieP — Tue, 03 Jun 2025 14:55:50 GMT

Unfortunately for me, it is not a wifi or router issue. If it was, I would have fixed it myself.

Can you please therefore inform me on why my SNR margin continues to fall, therefore degrading my speeds. Also if you check your logs, there was a "port issue" in March (as I was informed by another Plusnet agent).

Just to let you know, I have an Asus GT-BE98 Router, connected to a Draytek Vigor 167 modem (in modem mode). My equipment is working correctly.

Sincerely request Openreach engineer to check issues at cabinet/exchange for issues.

Re: Line Speed keeps dropping

UKAussieP — Tue, 03 Jun 2025 15:00:12 GMT

Adding for clarity:

Re: Line Speed keeps dropping

UKAussieP — Tue, 03 Jun 2025 15:00:43 GMT

Also, please explain why the SNR is low?

Re: Line Speed keeps dropping

UKAussieP — Tue, 03 Jun 2025 15:05:57 GMT

Oh and BTW, the speeds tests have been conducted via ethernet cable (not wifi)

Re: Line Speed keeps dropping

UKAussieP — Tue, 03 Jun 2025 15:07:50 GMT

Happy for a Plusnet Support agent to call me anytime.

Re: Line Speed keeps dropping

RobPN — Tue, 03 Jun 2025 15:41:26 GMT

@UKAussieP

It's not SNR, it's SNR margin, and generally speaking its level controls your connection speed as a trade-off against stability.

If you want a higher SNR margin then you'll get a lower speed, but better stability.

Perhaps you'd like to research it for yourself as you seem to think higher is better;

SNR margin VDSL

Re: Line Speed keeps dropping

UKAussieP — Tue, 03 Jun 2025 15:49:52 GMT

Hi @RobPN

Thanks for your reply

If you look at my first post, I was getting consitent speeds of about 73Mbps (and I have been getting that for years), In March this dropped to about 64Mbps, and a couple of weeks ago, my speeds dropped again to 54Mbps - DLM reset and Im getting 56-57Mbps

I mention SNR Margins, because it seems to be 'artifically' increasing my speeds to 56Mbps, Id hate to see what my speeds where when it was normally at 6dB.

So, the issue is.... Why has my speeds dropped. What happened in March for it do so, and then again a couple of weeks ago. To resolve an issue, one must investigate and determine the cause.

Cheers.

Re: Line Speed keeps dropping

UKAussieP — Tue, 03 Jun 2025 15:53:30 GMT

@RobPN

From your link:

Hence the reason I keep referring to it.

Re: Line Speed keeps dropping

UKAussieP — Tue, 03 Jun 2025 16:41:02 GMT

Just phoned Plusnet Support.

They will send me their own router - so they can do their tests.