topic Re: Speed suddenly capped in Broadband

Speed suddenly capped

sweeep1963 — Wed, 24 Apr 2024 17:28:45 GMT

I noticed my router resynced at some point over the last day and now seems to be capped at a sync speed of 48.997 Mbps. I've tried manually resyncing multiple times and every time its the exact same which leads me to believe there has been a cap put in place. It was working fine with no outages for a while before this, syncing above 55mbps.

Re: Speed suddenly capped

jab1 — Wed, 24 Apr 2024 17:33:42 GMT

@sweeep1963 Are you sure you haven't had any 'outages' - a speed reduction like this, especially to a capped figure as this appears to be, doesn't happen for no reason.

Re: Speed suddenly capped

sweeep1963 — Wed, 24 Apr 2024 17:39:51 GMT

Nope no outages whatsoever, only router reboots have been from me testing various options, qos etc. Not lost connection once outside of that.

Re: Speed suddenly capped

jab1 — Wed, 24 Apr 2024 17:41:38 GMT

Which router are you using? - it would be interesting to see the Event Log.

Re: Speed suddenly capped

sweeep1963 — Wed, 24 Apr 2024 17:49:00 GMT

Using the DSL-AX86U. I've checked the general log but it only seems to go back as far as around 8am this morning but the resync happened some time overnight based on what the DSL uptime was when I checked.

Re: Speed suddenly capped

jab1 — Wed, 24 Apr 2024 18:00:57 GMT

Ah, OK, not much help then, but some kit is like that. Can you, though, post the general information page - don't know what it is called on there, but I'm interested in U/S and D/s noise margins and anything else on the page that displays that.

Re: Speed suddenly capped

sweeep1963 — Wed, 24 Apr 2024 18:06:17 GMT

Sure, here. I've noticed the SNR has gone up by about 2dB and the stability adjustment of the router no longer works (this feature lets you reduce/increase the SNR to increase speeds or improve stability - it has worked pretty well without increasing instability since I've used it).

Re: Speed suddenly capped

jab1 — Wed, 24 Apr 2024 18:11:59 GMT

I can't see anything out of place on there, apart from the fact that the U/S attenuation is reading as '0.0', but something has capped you, certainly.😕

Re: Speed suddenly capped

sweeep1963 — Wed, 24 Apr 2024 18:15:53 GMT

Yep it's strange. Yes the U/S attenuation has been like that since I bought the router, must be a visual bug or something

Re: Speed suddenly capped

jab1 — Wed, 24 Apr 2024 18:27:13 GMT

Quite possibly a visual bug, or a general error in the kits coding - who knows? To be honest, I think this needs Help Team assistance, but their visibility on here is almost non-existent, unfortunately. All I can suggest at the moment is that you give the bot a kick: https://www.plus.net/help/report-a-problem/

Re: Speed suddenly capped

Ian06 — Thu, 25 Apr 2024 10:39:12 GMT

@sweeep1963 wrote:

only router reboots have been from me testing various options, qos etc.

How often did you reboot the router..? The reboots may look like a line drop to the DLM software, if the line drops frequently the DLM software will drop the speed. I don't think the DLM will necessarily know you did a reboot - I guess it depends how you did the reboot and if the link was cleanly brought down before the router was restarted.

Re: Speed suddenly capped

sweeep1963 — Thu, 25 Apr 2024 11:40:06 GMT

Maybe once a week or once every 2 weeks when I was testing configurations - it wasn't really a reboot just a changing config causing a resync. Only on occasion where the router may freeze would I need to reboot it. I was indeed worried about the DLM viewing it as instability. I hadn't touched it for about 2 weeks until this happened though.

Re: Speed suddenly capped

sweeep1963 — Wed, 01 May 2024 08:00:50 GMT

Anyone from plusnet willing to look into this?

Re: Speed suddenly capped

jab1 — Wed, 01 May 2024 08:07:46 GMT

Did you do as I suggested in post #10?

Re: Speed suddenly capped

willcutforth — Wed, 01 May 2024 11:00:42 GMT

Had a look for you @sweeep1963 and speed is syncing at 48 from our side with no cap on there. The speed isn't below the MGS so not much we can do really. Is the setup optimised?

Re: Speed suddenly capped

sweeep1963 — Wed, 01 May 2024 11:04:40 GMT

@willcutforth Thanks for taking a look for me. It definitely seems capped to me as every time I force a resync it is the exact same value of 48997Kbps. The noise margin is also increased and can no longer be modified by the stability adjustment of the router. Was syncing fine 5 days ago at ~56000Kbps.

Re: Speed suddenly capped

Townman — Fri, 03 May 2024 01:38:30 GMT

@sweeep1963 wrote:

Sure, here. I've noticed the SNR has gone up by about 2dB and the stability adjustment of the router no longer works (this feature lets you reduce/increase the SNR to increase speeds or improve stability - it has worked pretty well without increasing instability since I've used it).

Gone up from what?

That set by the DLM or that fudged by messing with the router settings?

That screen shot showed (at the time) SNRM of 6dB US & DS which is the default target for the DLM. The fact that the router is no longer allowing you to adjust the SNRM is either a router fault or there is some means of it it being disabled in the line handshake sequence.

Having looked at an example settings page, is the setting simply currently set to "Disabled" or are you unable to select the option to change it?

Does the router indicate the VDSL profile?

@willcutforth what is the service profile for this line please - speed or stability?

Re: Speed suddenly capped

willcutforth — Fri, 03 May 2024 08:43:08 GMT

@Townman it is set at stable. Need me to do anything?

Re: Speed suddenly capped

Townman — Fri, 03 May 2024 09:12:23 GMT

@willcutforth

Not my call, but looking for reasons for the DLM not budging. Could that be the reason the DLM is keeping the SNRM stuck to 6dB? My DS runs at 3dB very nicely (do not know my profile).

Re: Speed suddenly capped

sweeep1963 — Fri, 03 May 2024 09:43:33 GMT

I'm unsure what exactly changed - it resynced overnight and has been like this since - data rate capped at 48997. The stability adjustment setting is still available but not longer seems to work - no matter what adjustment I apply the SNR margin remains the same (and hence the sync speed). VDSL profile is 17a.

Would it be possible for the service profile to be changed to speed - just to see how it goes?