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Noise margin change and speed loss

shermsta — Sun, 28 Jun 2020 14:41:57 GMT

Hi,

Ive recently noticed ive lost speed and my noise margin no longer seems to aim for 3.5 it aims for 4.5 instead?

Heres a screenshot of my routers stats:

Re: Noise margin change and speed loss

imjolly — Sun, 28 Jun 2020 14:55:39 GMT

what caused the reset just over a day ago? probably when noise margin increased and speed reduced slightly

from your stats you have G.INP active hence why your speed is actually higher than attainable

have you any noise on line dial 17070 option 2 should be silent and best with corded phone

Re: Noise margin change and speed loss

shermsta — Sun, 28 Jun 2020 15:06:11 GMT

Thanks for the reply, I'm not sure why the router rebooted itself the other day, I find that happens every couple of weeks anyways. What im confused about is my noise margin used to be like 3.4 and I used to be connected at like 71000. Just wondering why the sudden change. Theres no noise on the silent line test either.

Does it look to you like it's trying to aim for a 4.5 noise margin?

Re: Noise margin change and speed loss

pippincp — Sun, 28 Jun 2020 18:40:55 GMT

There are only 2 target noise margins. 6.0dB without G.INP and 3.0dB with G.INP.

Re: Noise margin change and speed loss

imjolly — Sun, 28 Jun 2020 18:52:11 GMT

If no noise on quiet line test then as long as you can now maintain a stable connection then your speed should return automatically

Re: Noise margin change and speed loss

shermsta — Sun, 28 Jun 2020 19:35:46 GMT

So best thing to do is just leave it a couple weeks and the speed should go back to normal when the DLM see's that I can hold a stable connection? Could the router be faulty in anyway?

Re: Noise margin change and speed loss

imjolly — Sun, 28 Jun 2020 19:38:26 GMT

I drop in connection doesn't make hub faulty. Just watch and hope that it is now stable

Re: Noise margin change and speed loss

Mooly — Mon, 29 Jun 2020 10:40:58 GMT

Your stats show a firmware upgrade on the 20th June. Would that not account for the reboot?

I've noticed (Hub 6) that firmware updates can also suddenly alter the figures for certain items, in my case line attenuation and signal. Nothing changed on the line, only the Hub firmware and so presumably the way the figures are interpreted and displayed.

For the Hub 6 I usually see a 6.3/6.3 or thereabouts noise margin, however the Hub 6 does weekly reboots following the latest firmware (well mine does) and I caught it the other day displaying an altering noise margin. I think it was 4.1/6.3 and then it went to 4.7/6.3 following which it rebooted (on cue, the 7 days was up) and the margin reset back to around 6.3/6.3

There seems a lot of ambiguity over all this and some of the Hub stats are just plain wrong such as data amounts. I think I would know if I uploaded 15Gb after a reboot but something of that order was showing.

Re: Noise margin change and speed loss

shermsta — Fri, 03 Dec 2021 10:18:56 GMT

Hi,

I posted the original problem I was having on this thread a few months ago and thought the problem with my speed would sort itself out however it has now taken a turn for the worst as you will see below with my stats:

It now seems to have locked itself aiming for a 7.5 noise margin. No matter how many times I reboot the router it wont go above 54.999.

It use to aim for a 3.5 noise margin is there something wrong with my line?

Re: Noise margin change and speed loss

imjolly — Fri, 03 Dec 2021 10:42:37 GMT

this thread you started about 18 months ago!

if you are rebooting the hub to try and improve your speed and lower noise margin then you are actually achieving the very opposite to get any improvement you need a stable connection but looking at your stats your attainable in only 59mb now compared to 67mb 18 months ago

check for line noise dial 17070 option 2 should be silent and best with corded phone

Re: Noise margin change and speed loss

shermsta — Fri, 03 Dec 2021 10:55:54 GMT

Thanks for your reply,
O yes it was 18 months ago! haha
I did the quiet line test and cant hear anything. I only rebooted my router once the speed had dropped to 54.999 to see if it was the router playing up, I wont reboot it again. I was told last time that its best to just leave it to see if my original speed came back, it didn't. So does it look like im stuck with 54.99 now? Also isn't a 7.5 noise margin high? I remember when i was like 3.5 a few years ago.

Thanks

Re: Noise margin change and speed loss

shermsta — Fri, 03 Dec 2021 15:30:17 GMT

54.999 Mbps - This stat looks locked at that speed. I am on fibre 2 but do you think ive been given fibre 1 speed for some reason? Can bt please run a line test. I'm quite anoyed about losing so much speed.

Re: Noise margin change and speed loss

imjolly — Fri, 03 Dec 2021 15:35:01 GMT

you you had been moved to fibre 1 then up speed would be restricted to 10mb and it is at 12mb

have you tried using the test socket with a filter to see if that helps your connection and post new stats - especially attainable speed which is currently only 59mb

Re: Noise margin change and speed loss

shermsta — Fri, 03 Dec 2021 15:37:20 GMT

I will try the test socket now, Could a mod on here do a DLM reset would that help?

Re: Noise margin change and speed loss

imjolly — Fri, 03 Dec 2021 15:44:21 GMT

from your stats there is nothing to suggest a DLM reset is needed - normally after a fault has been found with engineer visit

Re: Noise margin change and speed loss

shermsta — Fri, 03 Dec 2021 15:48:13 GMT

These stats are plugged into the test socket, the stats suggest there was a firmware update last night, could this effect it? Is there any way for a mod to do a line test for me at least?

Re: Noise margin change and speed loss

shermsta — Fri, 03 Dec 2021 15:56:46 GMT

Can a mod not reset it so my line target like 3.5?

Re: Noise margin change and speed loss

pippincp — Fri, 03 Dec 2021 16:49:51 GMT

A DLM reset won't give you a target of 3.5 and cannot be forced.

Re: Noise margin change and speed loss

shermsta — Fri, 03 Dec 2021 16:56:03 GMT

Ok, but does whats happened to my stats suggest theres a fault on my line somewhere. Is a 7.5 noise margin normal?

Re: Noise margin change and speed loss

imjolly — Fri, 03 Dec 2021 17:03:21 GMT

If you think there is a fault on your line then report it to CS 150 and get engineer visit