cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 
Highlighted
Aspiring Contributor
1,200 Views
Message 1 of 13

Noise Margin Query

Go to solution

Hello

 

I have recently joined BT for my broadband (16Meg Unlimited).

 

I had a problem with the router dropping out and rebooting, I thought that this was just the system settling down etc, however after about 10 days I noticed that things had gone slow so started doing some investigation and found that everytime the phone was rang/used that is when the Internet dropped out. I traced the fault to the filter and since having replaced the filter everything has been stable and speed has increased, all good then you say!

 

I have kept a log of the updates/reboots, I have not touched/rebooted the router since the filter has been replaced per everything I have read on here. Please below for the log

 

16:52:16, 05 Feb. ( 1270.420000) DSL noise margin: 6.00 dB upstream, 14.90 dB downstream
16:52:15, 05 Feb. ( 1269.510000) DSL line rate: 669 Kbps upstream, 6656 Kbps downstream

This when I found the issue with the filter. Note the increase in upstream.

19:26:46, 05 Feb. (10540.350000) DSL noise margin: 6.10 dB upstream, 15.30 dB downstream
19:26:45, 05 Feb. (10539.440000) DSL line rate: 1188 Kbps upstream, 6656 Kbps downstream

 

06:22:53, 10 Feb. (395504.760000) DSL noise margin: 6.10 dB upstream, 15.00 dB downstream
06:22:53, 10 Feb. (395503.850000) DSL line rate: 1160 Kbps upstream, 14045 Kbps downstream

This was a reboot by the router

 

04:17:38, 13 Feb. (647187.910000) DSL noise margin: 5.80 dB upstream, 15.00 dB downstream
04:17:37, 13 Feb. (647186.890000) DSL line rate: 1207 Kbps upstream, 13541 Kbps downstream

Another reboot by the router


00:49:34, 14 Feb. (721103.480000) DSL noise margin: 6.00 dB upstream, 15.00 dB downstream

00:49:33, 14 Feb. (721102.460000) DSL line rate: 1184 Kbps upstream, 13573 Kbps downstream

Another reboot by the router This has been the last reboot of the router and is still up and running with no interruptions.

Connection time: 6 days, 11:46:48
Downstream: 13.26 Mbps
Upstream: 1.156 Mbps

 

Now for the question? Everything I have read says that BT tries for a noise margin of 6db and this is fine on the upstream but not on the Downstream. Will this correct itself in time or does this require a reset?

 

Edied to say that the exchange is just down the road from my house and acording to the engineer is just under 600 Mts reading off his meter.

 

Many Thanks

 

Mark

0 Ratings
12 REPLIES 12
Highlighted
Distinguished Sage
1,195 Views
Message 2 of 13

Re: Noise Margin Query

Go to solution

Once the Forum Mods have read your post they will post an invite here once you reply to them they will take personal ownership of the problem until resolved.
Do not send them a Personal Message as this is the incorrect contact method and cannot be properly tracked also the mod contacted may not be on shift for sometime and this will delay your help

The forum mods normally reply within 3/5 working days after you have contacted them
They will contact you personally by email or phone

 mod contact.JPG

0 Ratings
Highlighted
Aspiring Contributor
1,191 Views
Message 3 of 13

Re: Noise Margin Query

Go to solution

John

 

That was quick! Will do

 

Thanks for the speedy reply

 

Mark

0 Ratings
Highlighted
Moderator
Moderator
1,185 Views
Message 4 of 13

Re: Noise Margin Query

Go to solution

Hi Markendo,

 

Welcome to the forum and thanks for posting about your noise margin, please use the 'contact the mods' link in my forum profile under the 'about me' section to send in your details and we'll look into this. You can find the link by clicking on my username.


Thanks

Neil

0 Ratings
Highlighted
Aspiring Contributor
1,179 Views
Message 5 of 13

Re: Noise Margin Query

Go to solution

Contacted

 

Thanks

0 Ratings
Highlighted
Aspiring Contributor
1,144 Views
Message 6 of 13

Re: Noise Margin Query

Go to solution

Hello

 

I would like to add that my router reset itself again yesterday. I'm not sure if this was reset by the Mods or not as I have had no contact from them as yet, I would like to add that I wasn't expecting any contact until maybe next week.

 

Anyway here is the results of yesterdays reset.

 


18:32:54, 22 Feb. (1476097.660000) DSL noise margin: 5.90 dB upstream, 12.10 dB downstream
18:32:53, 22 Feb. (1476096.750000) DSL line rate: 1207 Kbps upstream, 15297 Kbps downstream

 

Noise margin down on the downstream now. so going in the right direction.

 

Many thanks

 

Mark

0 Ratings
Highlighted
Distinguished Sage
Distinguished Sage
1,142 Views
Message 7 of 13

Re: Noise Margin Query

Go to solution

I don't think it was mods if they have not made contact more like DLM seeing line stable and starting to reduce noise margin and increase speed as part of automatic process



If you like a post, or want to say thanks for a helpful answer, please click on the Ratings 'Thumbs up' on left hand side.
If someone answers your question correctly please let other members know by clicking on ’Mark as Accepted Solution’.
0 Ratings
Highlighted
Aspiring Contributor
1,137 Views
Message 8 of 13

Re: Noise Margin Query

Go to solution

Hello imjolly

 

So, it looks like there is no particular time frame for when the DLM implements any adjustment?

 

Can I ask, what would be the consequences of a high noise margin besides a lower download speed? thinking out aloud here, would this include dropping of data packets etc?

 

Many Thanks

 

Mark

0 Ratings
Highlighted
Distinguished Sage
1,134 Views
Message 9 of 13

Re: Noise Margin Query

Go to solution
It would not affect any packet loss just connection speed

It can sometimes take up to 10 days to start releasing but the normal time scale is 3/5 days
Highlighted
Distinguished Sage
Distinguished Sage
1,132 Views
Message 10 of 13

Re: Noise Margin Query

Go to solution

normally the automatic process and many quote on the forum as stable for 3/5 days.  Higher noise margin reduces your connection speed which reduces your ip profile and that reduces your download speed

 

normal is about 6db but on some good stable connection BT now run with a 3db noise margin.  However sometimes the 3db is to low and causes high crc/hec errors especially at night significantly reducing download/throughput so these people need to go back to normal 6.  for some even 6db can be a problem so some run on 9db



If you like a post, or want to say thanks for a helpful answer, please click on the Ratings 'Thumbs up' on left hand side.
If someone answers your question correctly please let other members know by clicking on ’Mark as Accepted Solution’.