Is my downstream noise margin too high?

As you can see from these stats I have an issue with speed at the moment. I have an engineer coming out tomorrow. Is there any direction I can point him in looking at these numbers.
1. Product name:
BT Home Hub
2. Serial number:
+068343+NQ35147172
3. Firmware version:
Software version 4.7.5.1.83.8.173.1.6 (Type A) Last updated 11/03/14
4. Board version:
BT Hub 5A
5. VDSL uptime:
0 days, 11:21:30
6. Data rate:
19999 / 32394
7. Maximum data rate:
21878 / 70147
8. Noise margin:
6.0 / 16.6
9. Line attenuation:
0.0 / 16.0
10. Signal attenuation:
0.0 / 16.0

DLM has capped ur rate.
you may have line problems.
there are some known issues with the HH5.
do you have a openreach modem ?

Similar Messages

Noise margin too high

Hi,
I have always had 7Mbps since getting broadband more than 8 years ago. This continued when I switched to bt 3 years ago. I have got a bit lazy checking the speed but have found it has dropped to 2Mbps (checked with BT speed checker and others) when I checked last week. Last year I lost broadband to a fault that was eventually traced to the exchange and fixed. I believe the noise margin was adjusted up then.
I have not changed any phone wiring, router settiings etc in the 3 years I have had bt broadband and the hh3. I don't need it a such a high figure as my broadband has always been stable. I have even moved my hh3 from an extension in the living room to being plugged into the master socket in the hall, to no avail.
Can the mods drop my noise margin to 6db ?
The connection to my hub is 8Mbps from the exchange :
Line state:
Connected
Connection time:
2 days, 05:24:55
Downstream:
7.938 Mbps
Upstream:
448 Kbps
ADSL Settings
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
G.992.1 Annex A
Latency type:
Interleaved
Noise margin (Down/Up):
13.5 dB / 26.0 dB
Line attenuation (Down/Up):
14.1 dB / 6.5 dB
Output power (Down/Up):
19.9 dBm / 12.1 dBm
FEC Events (Down/Up):
204101 / 102
CRC Events (Down/Up):
192 / 36
Loss of Framing (Local/Remote):
0 / 0
Loss of Signal (Local/Remote):
0 / 0
Loss of Power (Local/Remote):
0 / 0
HEC Events (Down/Up):
5811 / 37
Error Seconds (Local/Remote):
17 / 18
Solved!
Go to Solution.

Hi jonbaker65,
Your noise margin is fine. As you are on the 20cn network and close to the exchange the high noise margin just means that if your exchange get's upgraded to the 21cn network then you have lots of margin for improvement.
As your on the 20cn network and on ADSLMax, your IP profile has decreased to 2mbps possibly due to a recently lower sync rate (which has now gone back to ~8mbps)
Normally when this happens the IP Profile should automatically increase in 3 to 5 days time with a stable connection
To confirm this, please can you run a http://speedtest.btwholesale.com speedtest and post the further diagnostic test (You will need to do the quick test first and then click the further diagnostics button)
Then post the speedtest results with the IP Profile, it should look something like this (though ofcourse better then my example below ) :
It is also advised to keep the homehub/router switched on constantly and connected 24/7, as any restarts/disconnections or turning off of the router/homehub will make the dlm (exchange equipment) think there is a problem with your line and will either increase your noise margin, decrease your IP Profile, decrease your sync rate.
This is done automatically to stabilise the line.
Sometimes the IP Profile will not automatically release in the 3 to 5 day period and will require the BT Care Team to manually reset the IP Profile for you.
The BT Care Team usually require a 3+day DSL connection up time to show that your line is stable so that the IP Profile will not just get stuck at 2mbps again in a few days time.
I'm no expert, so please correct me if I'm wrong

S10 noise level too high when closed

HI,
I just unpacked a new S10 6423 47G. I was startled by the noise level from the start and now that after completion of the windows setup the noise level has not gone down(I has hoping for a fan control issue), I have stopped further installation and am wondering what to do next.
The three fans seem ok and fairly quiet, I think the installation of the hard drive is also nicely solved.
When the unit is open the noise level is nothing great but ok. As soon as I put the side panel on, I have an increase in noise level that brings me over the tolerance treshold.
I am not sure about the reason, the panel is quite loose but when I press on certain or all parts there is no change in sound. It seems there is resonance in the entire case when I install the side panel. It starts even when the panel is not completey vertfical. In addition to the general noise level there also seems to be resonance of other frequencies as from time to time there is a humming with a frequency of a few changes a minute.
I am really disappointed, the "quiet like whipser noise level" (or so the ad went) was the thing that made me buy this computer without thinking much either about specs or price, I just wanted a reasonably quiet computer.
Any advice?
ThanksM.

Dear Brian,
thanks a lot for your info. I am relieved to see that the noise level is acceptable with your machine. That gives me hope.
FYI, I contacted Lenovo Germany and they were polite but not too helpful, they said that naturally this computer should be louder than a normal pc and did not want to hear much about the way the system is advertised as ultra-quiet. I do not believe in advertising promises but a moderately decent noise level i do expect.
I will return this unit to the dealer and order a new one - hoping that this is only a singular experience.
For me it is not an option to be unhappy with Lenovo - I like the Think series a lot and buy their notebooks all the time for business..
M.

High Noise Margin - Inconsistent Speed

Hi,
I had an issue between a month and two months ago, involving poor broadband speeds. This was eventually resolved after a line issue was detected and connection speeds are now better. However, when checking the noise margin through my homehub, the downstream noise margin is still much higher than before the fault (from reading other forum posts, I gather it should be around 6dB, whereas it ranges from 15dB - 17dB).
Download speeds also fluctuate frequently since the fix. This is more noticeable when I am using a platform such as Steam to download a larger file. Before the line fault, download speed was constant, and normally around 1.1 Mbps. Now, however, it varies anywhere from 200 Kbps to 900 Kbps and never remains constant for more than 2 or 3 seconds.
I have pasted the connection status page from my homehub below. Although the connection time shows 2 days, this was due to a restart I performed to see if it affected the line performance. Before this, I had 19 days continuous connection. A speedtest from speedtester.bt.com shows 5.67 Mbps download, 0.84 upload and 28.63 ping. Again, this is not as good as before the first line issue occurred.
Line state:
Connected
Connection time:
2 days, 16:37:59
Downstream:
6,607 Kbps
Upstream:
1,195 Kbps
ADSL settings
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
G.992.5 Annex A
Latency type:
Fast
Noise margin (Down/Up):
15.3 dB / 5.9 dB
Line attenuation (Down/Up):
36.5 dB / 21.3 dB
Output power (Down/Up):
0.0 dBm / 12.5 dBm
FEC Events (Down/Up):
0 / 0
CRC Events (Down/Up):
1276 / 183
Loss of Framing (Local/Remote):
0 / 0
Loss of Signal (Local/Remote):
0 / 0
Loss of Power (Local/Remote):
0 / 0
Loss of Link (Remote):
0
HEC Errors (Down/Up):
1526 / 113
Error Seconds (Local/Remote):
0 / 157
Is there any reason why these issues are still occurring?
Thanks,
Ben

Hi,
Thanks for the quick replies!
I have tried the quiet line test and there is no noise whatsoever on the line.
I have tried the test socket previously, but am currently trying it again. The downstream speed has risen slightly, but the noise margin remains unchanged. I have restarted the homehub twice since connecting to the test socket, and it has currently been connected to the test socket for around half an hour altogether (in between homehub restarts).
I have posted a screenshot from the BT speedtester in the next post.
Here are the connection details from the home hub:
Line state:
Connected
Connection time:
0 day, 00:07:36
Downstream:
7,703 Kbps
Upstream:
1,183 Kbps
ADSL settings
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
G.992.5 Annex A
Latency type:
Fast
Noise margin (Down/Up):
15.1 dB / 6.1 dB
Line attenuation (Down/Up):
36.5 dB / 21.3 dB
Output power (Down/Up):
0.0 dBm / 12.4 dBm
FEC Events (Down/Up):
0 / 0
CRC Events (Down/Up):
6 / 0
Loss of Framing (Local/Remote):
0 / 0
Loss of Signal (Local/Remote):
0 / 0
Loss of Power (Local/Remote):
0 / 0
Loss of Link (Remote):
0
HEC Errors (Down/Up):
15 / 0
Error Seconds (Local/Remote):
0 / 0
Thanks,
Ben

Far too low ADSL2+ downstream speed + too high noi...

Hi all, had ADSL2+ activated for a while now but seem to be stuck with poor download speeds (4504 sync). (Current router stats below). Had a few self reboots from the DSLAM which took my upload speed right up to 1+mb and noise margin down to 6 where it should be and it has been very stable, but the same hasn't happened with download speed. IP profile appears to be stuck at 3500 as im getting 3390 consistently with speedtester.net (i always get 96+% of profile speed as verified by Openreach!) This seems odd as bt speedtester reports IP profile of 4000 (still nowhere near what it should be of course!).
Downstream noise margin has hovered around 14.5-15.8db for the whole of the last 10 days. As you can see the errors are pretty low and connection has been rock solid. Router stays on ALWAYS 24/7, using a brand new very decent ADSL nation filter and brand new HH3 as of 2-3 weeks ago, connected to master socket with no extensions at all.
Wondering if im stuck on a banded profile? With my attenuation of 30.5 i should get around 13-15mb sync and throughput of around 11ish? Surely the DSLAM should have brought my DL + IP profile right up by now? I know another post on the forum here had a similar issue.
Happy with upload but not download! Any suggestions?
ROUTER STATS:
5. ADSL uptime:
10 days, 21:30:09
6. Bandwidth:
1163 / 4504
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
G.992.5 Annex A
Latency type:
Fast
Noise margin (Down/Up):
15.5 dB / 6.1 dB
Line attenuation (Down/Up):
30.5 dB / 17.2 dB
Output power (Down/Up):
18.9 dBm / 12.1 dBm
FEC Events (Down/Up):
0 / 0
CRC Events (Down/Up):
7095 / 963
Loss of Framing (Local/Remote):
0 / 0
Loss of Signal (Local/Remote):
0 / 0
Loss of Power (Local/Remote):
0 / 0
HEC Events (Down/Up):
4754 / 1077
Error Seconds (Local/Remote):
4647 / 673

I agree with your attenuation I would hope for faster speed but your high noise margin is the possible reason for your stable connection. you are not in a banded profile as noise margin would normally be 20+ .
did you get the email from BT explaining about the exchange upgrade and increase to your connection or did your exchange get upgraded and you have agreed a new contract to get the upgrade?
have you done the quiet line test to check for noise?
check this post for ideas
http://community.bt.com/t5/BB-in-Home/Poor-Broadband-speed/m-p/14217#M8397
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HH5 Noise Margin Infinity 2

Hi
My Noise margin is rated as 6.3/9.4 and my data rate is 14774 / 51645. Max data rate is 18137 / 63062. I have been monitoring the downstream noise margin and it is consistently sitting around the 9 mark. Is this causing my downstream data rate to be significantly slower than my Max rate?
Is a high noise margin the sign of an issue on the line / fault?
Any suggestions as to how I can get my data rate closer to the max - noticed my HH5 reboots every couple of days too?
Thanks

Thanks - I have been monitoring the noise level for 3 days and it has remained around the 9 mark with occasional drops to 7 which last for about 15 mins and then jump back up to 9 again.
Details for my line below. Until a couple of months ago I was getting a steady connection of around 60Mbps and looking at the max rate being reported by the Hub it does still seem to be reporting this however what I am actually getting is now around the 50 Mbps rate
Featured ProductsDownstream Line Rate(Mbps)Upstream Line Rate(Mbps)Downstream Range(Mbps)Availability Date
High Low High Low
FTTC Range A (Clean)
64.4
45.3
18.5
11.9
Available
FTTC Range B (Impacted)
54.8
30.6
18
7.9
Available

Noise margin

Hi,
I had 5.5MB connection, until BT upograded my exchange, ACCRINGTON a few weeks ago.
My connection was 9.5Mb for a few days, but by the end of the 10 days it had dropped as my V1 Hub was re-setting constantly.
I spoke to BT who sent me a new v2 Hub. which has been connected directly to the test socket.
My noise margin is high and does not seem to be dropping, and I assume this is why mt IP profile has been set to 1750
I have atatched my router stats, an speedteser results(The errors were from me removing the fromt plate on my BT socket to get to the test socket. They have not increased at all for over 5 days)
What can I do to improve my speed? I apprieciate any help you can offer.
ADSL line status
Connection information
Line state
Connected
Connection time
5 days, 6:41:34
Downstream
2,268 Kbps
Upstream
1,240 Kbps
ADSL settings
VPI/VCI
0/38
Type
PPPoA
Modulation
ITU-T G.992.5
Latency type
Interleaved
Noise margin (Down/Up)
29.4 dB / 5.6 dB
Line attenuation (Down/Up)
16.0 dB / 7.0 dB
Output power (Down/Up)
0.0 dBm / 12.3 dBm
Loss of Framing (Local)
10
Loss of Signal (Local)
1
Loss of Power (Local)
0
FEC Errors (Down/Up)
0 / 4294967263
CRC Errors (Down/Up)
0 / 2147480000
HEC Errors (Down/Up)
nil / 0
Error Seconds (Local)
2
Test1 comprises of two tests
1. Best Effort Test: -provides background information.
Download Speed
1879 Kbps
0 Kbps
2000 Kbps
Max Achievable Speed
Download speedachieved during the test was - 1879 Kbps
For your connection, the acceptable range of speedsis 800-2000 Kbps.
Additional Information:
Your DSL Connection Rate :2268 Kbps(DOWN-STREAM), 1239 Kbps(UP-STREAM)
IP Profile for your line is - 1750 Kbps
The throughput of Best Efforts (BE) classes achieved during the test is - 13.36:30.0:56.65 (SBE:NBEBE)
These figures represent the ratio while sententiously passing Sub BE, Normal BE and Priority BE marked traffic.
The results of this test will vary depending on the way your ISP has decided to use these traffic classes.
2. Upstream Test: -provides background information.
Upload Speed
1024 Kbps
0 Kbps
1239 Kbps
Max Achievable Speed
>Upload speed achieved during the test was - 1024 Kbps
Additional Information:
Upstream Rate IP profile on your line is - 1239 Kbps
We were unable to identify any performance problem with your service at this time.

I have tried the quiet line test and it seems clear, no noticeable noise at all.
I have changed the filter for the other one that came with the new hub, and swapped the RJ11 cable round.
Where do I go from here ?
ADSL line status
Connection information
Line state
Connected
Connection time
0 days, 0:07:39
Downstream
2,268 Kbps
Upstream
1,236 Kbps
ADSL settings
VPI/VCI
0/38
Type
PPPoA
Modulation
ITU-T G.992.5
Latency type
Interleaved
Noise margin (Down/Up)
29.6 dB / 6.3 dB
Line attenuation (Down/Up)
16.0 dB / 7.1 dB
Output power (Down/Up)
0.0 dBm / 12.4 dBm
Loss of Framing (Local)
0
Loss of Signal (Local)
0
Loss of Power (Local)
0
FEC Errors (Down/Up)
0 / 0
CRC Errors (Down/Up)
0 / 2147480000
HEC Errors (Down/Up)
nil / 12
Error Seconds (Local)
0

Noise margin reset

Hi
After many months of ADSL problems I've identified the source was most likely interference picked up on extension wiring. The extensions are now disconnected and at last check I had over 5 days up time. However, the downstream connection speed remains painfully slow at 575kbps whilst the downstream noise margin is 29.9db.
I understand that I need to get the noise margin reset to sort this out. Can anyone confirm that my hubstats look OK and give me a hint as to the quickest way to get the noise margin reset? Thanks in advance for your help.
Line state
Connected
Connection time
5 days, 4:29:36
Downstream
575 Kbps
Upstream
1,169 Kbps
ADSL Settings
VPI/VCI
0/38
Type
PPPoA
Modulation
ITU-T G.992.5
Latency type
Interleaved
Noise margin (Down/Up)
29.9 dB / 5.5 dB
Line attenuation (Down/Up)
31.0 dB / 16.2 dB
Output power (Down/Up)
0.0 dBm / 12.5 dBm
Loss of Framing (Local)
11
Loss of Signal (Local)
1
Loss of Power (Local)
0
FEC Errors (Down/Up)
466 / 4294967264
CRC Errors (Down/Up)
0 / N/A
HEC Errors (Down/Up)
N/A / 0
Error Seconds (Local/Remote)
1
Solved!
Go to Solution.

Hi
I am sorry to see you are having problems
I suggest you contact the forum mods they should be able to get your banded profile lifted for you this is a link to them http://bt.custhelp.com/app/contact_email/c/4951
They normally reply by email or phone directly to you within 3 working days they will take personal ownership of your problem until resolved and will keep you informed of progress
They are a UK based BT specialist team who have a good record at getting problems solved
This is a customer to customer self help forum the only BT presence here are the forum moderators
If you want to say thanks for a helpful answer,please click on the Ratings star on the left-hand side If the reply answers your question then please mark as ’Mark as Accepted Solution’

Noise Margin a bit high?

It's not to high, however, when i have my interleaving changed over auto my noise margin has gone no lowered that 8.0db, also it hasn't allowed me to sync any higher than 6.3mb when previously i was getting between 7-7.5MB, would this be the problem for me not achieving higher sync?
Line state:
Connected
Connection time:
0 days, 20:21:18
Downstream:
6.303 Mbps
Upstream:
1.04 Mbps
ADSL Settings
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
G.992.5 Annex A
Latency type:
Interleaved
Noise margin (Down/Up):
8.6 dB / 5.3 dB
Line attenuation (Down/Up):
41.7 dB / 23.9 dB
Output power (Down/Up):
19.7 dBm / 12.6 dBm
FEC Events (Down/Up):
42014 / 259
CRC Events (Down/Up):
64 / 384
Loss of Framing (Local/Remote):
0 / 0
Loss of Signal (Local/Remote):
0 / 0
Loss of Power (Local/Remote):
0 / 0
HEC Events (Down/Up):
626 / 201
Error Seconds (Local/Remote):
40 / 285
If you want to say thanks for a helpful answer, please click on the Ratings star on the left-hand side If the the reply answers your question then please mark as ’Mark as Accepted Solution
Solved!
Go to Solution.

i would ask the mods to reset your noise margin to 6 which will increase your connection speed. also many 21CN adsl2+ connections are running on noise margins of 3db so with a stable connection it may well be that your connection will do likewise given more time
contact mods
can take up to 3 working days for mods to contact you
If you like a post, or want to say thanks for a helpful answer, please click on the Ratings star on the left-hand side of the post.
If someone answers your question correctly please let other members know by clicking on ’Mark as Accepted Solution’.

Constant brief disconnects - high noise margin? Pl...

Hi. Desperately seeking some help, this problem is driving me mad.
Every evening when using my XBOX360, my connection is dropping from time to time. The middle light either disappears and reappears or goes yellow, flashes for a bit, then ultimately comes back. It doesn't generally stay off long but the effect it's having is that I lose connection to the game (NHL 11) and get credit for a disconnect loss.
I've spent countless hours on this to no avail. I've done all the usual tricks and nothing. I then spent a while reading every thread before posting this just in case -- seems there's 1 or 2 others who've experienced some similar things. 1 thing I will do is email the mods to ask if my line can be changed to fast as I've read that may help a gamer like me. I also read that the noise margin should be in the 6 region while mine currently sits at 2.5x that amount.
I'd REALLY appreciate some help here. I'll pay it forward however I can; heck, I'd pay good money to get this **bleep** problem fixed.
Line state
Connected
Connection time
0 days, 00:40:03
Downstream
11,998 Kbps
Upstream
888 Kbps
ADSL Settings
VPI/VCI
0/38
Type
PPPoA
Modulation
G.992.5 Annex A
Latency type
Interleaved
Noise margin (Down/Up)
14.9 dB / 14.6 dB
Line attenuation (Down/Up)
17.0 dB / 6.2 dB
Output power (Down/Up)
18.0 dBm / 1.3 dBm
Loss of Framing (Local/Remote)
0 / 0
Loss of Signal (Local/Remote)
0 / 0
Loss of Power (Local/Remote)
0 / 0
FEC Errors (Down/Up)
15 / 0
CRC Errors (Down/Up)
1 / 0
HEC Errors (Down/Up)
1 / 0
Error Seconds (Local/Remote)
1 / 0

Thanks for replying. I have moved the Home Hub to at least five different areas, all in good space and free of any interference. I've had it in my window, in my hallway and also raised high in my living room. It hasn't made any difference. I've tried every possible means I can think of or that I've read. I actually just this second got disconnected again. Think it lasted about 40 minutes this time.
Here are the new stats:
Line state
Connected
Connection time
0 days, 00:02:57
Downstream
11,847 Kbps
Upstream
888 Kbps
ADSL Settings
VPI/VCI
0/38
Type
PPPoA
Modulation
G.992.5 Annex A
Latency type
Interleaved
Noise margin (Down/Up)
15.0 dB / 14.1 dB
Line attenuation (Down/Up)
16.9 dB / 6.2 dB
Output power (Down/Up)
17.8 dBm / 1.3 dBm
Loss of Framing (Local/Remote)
0 / 0
Loss of Signal (Local/Remote)
0 / 0
Loss of Power (Local/Remote)
0 / 0
FEC Errors (Down/Up)
0 / 15
CRC Errors (Down/Up)
0 / 110
HEC Errors (Down/Up)
0 / 0
Error Seconds (Local/Remote)
0 / 6

Low speed - very high noise margin

Hi,
I'm looking to see if someone could resolve my connection issues. About a fortnight ago my broadband connection kept cutting out until I restarted the router, then the connection appeared fine (indeed, I was able to download 18GB that day). The following day, however, the noise margin was set much higher and the IP Profile was restricted to just over 1,000kbps.
The problem got worse as my housemate kept restarting the router in a bid to get the speed back to normal (normal being about 8Mbps). As a result, for the past week the speed has been at 575kbps.
There was no crackly interference when I tried the 17070 quiet line test and the stats I've attached to the bottom of this post are with the line plugged into the test socket:
Previous to plugging in the test socket, the stats were very similar - speed of 575kbps, noise margin in the 40s, and something like 40 'FEC down' events over the past three days.
There are now no other phoneline devices connected in the house at present (there was a landline phone which had been plugged in to another room, but was removed as a potential solution to the broadband speed problems).
Is it possible that a BTCare mod might be able to reset the noise margin to something more manageable?
Thanks in advance.
Line state:
Connected
Connection time:
0 day, 00:14:20
Downstream:
575 Kbps
Upstream:
440 Kbps
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
G.992.5 Annex A
Latency type:
Interleaved
Noise margin (Down/Up):
46.6 dB / 29.6 dB
Line attenuation (Down/Up):
21.5 dB / 9.9 dB
Output power (Down/Up):
0.0 dBm / 12.1 dBm
FEC Events (Down/Up):
0 / 0
CRC Events (Down/Up):
0 / 0
Loss of Framing (Local/Remote):
0 / 0
Loss of Signal (Local/Remote):
0 / 0
Loss of Power (Local/Remote):
0 / 0
Loss of Link (Remote):
0
HEC Errors (Down/Up):
0 / 0
Error Seconds (Local/Remote):
0 / 0
Solved!
Go to Solution.

Hi
As John46 has said, you have been put into a banded profile automatically by the exchange equipment as the exchange has detected a multiple loss of connections (eg resyncs) over a period of time due to disconnections between the hub and the exchange.
The system (dlm) will automatically release you from the banded profile after 3 to 5 days of a stable connection. Though your speed may take some time to recover.
This is automatically done to prevent errors and to stabilise the line.
As your on ADSL2+ your IP Profile will be 88.2% of connection speed, as your connection speed gets better and out of the banded profile your IP Profile will immediately change automatically.
It is advised to keep the homehub/router switched on constantly and connected 24/7, as any restarts/disconnections or turning off of the router/homehub will make the dlm think there is a problem with your line and will either increase your noise margin, decrease your IP Profile, decrease your sync rate or put you into a banded profile.
This is done automatically to stabilise the line.
If you are not released from the banded profile in 3/5+ days then come back here and we can look into the issue further. If needed you can get manual be released from the banded profile (if not automatically already done so) by the BT Care Team then come back here, but you will need to have a 3+day stable connection first.
Hope that helps,
Cheers
I'm no expert, so please correct me if I'm wrong

Line dropping and high Noise margin follwing Excha...

Hi guys.
Back again for my biannual problem solving session. So heres my story. Our internet went off last Thursday for 10 minutes or so followed by an email letting us know that our local exchange had been upgraded, then began the problems. Incidentally, inicially I wa over the moon, my speed had increased to a blistering 10.8 Mbps.
From then on, whenever we mad eor received a phone call our broadband would drop out. I made the usual call to India, mive the hub etc etc but to no avail. eventually I decided to buy and change the micro filters. This worked, great, but why did I have to do this? Why did my filters no longer work?
I had hoped that would be the end of it, still at regular intervals, the BB is dropping out and reconnecting, each time it reconnects, the HH2 is syncing at a lower speed and the Noise margin is increasing. Only slowly but it is very irritating. We have gone down from 10.8 to just over 9Mbps. Where will it end? Anyhoo, I have spoke to India again and they are looking into it.
Any ideas/comments? Here are my stats.
ADSL line status
Connection information
Line state
Connected
Connection time
0 days, 9:28:53
Downstream
10,883 Kbps
Upstream
1,112 Kbps
ADSL settings
VPI/VCI
0/38
Type
PPPoA
Modulation
ITU-T G.992.5
Latency type
Interleaved
Noise margin (Down/Up)
8.7 dB / 5.7 dB
Line attenuation (Down/Up)
35.0 dB / 18.5 dB
Output power (Down/Up)
0.0 dBm / 12.7 dBm
Loss of Framing (Local)
0
Loss of Signal (Local)
0
Loss of Power (Local)
0
FEC Errors (Down/Up)
0 / 4294967264
CRC Errors (Down/Up)
672 / N/A
HEC Errors (Down/Up)
N/A / 0
Error Seconds (Local)
360
Solved!
Go to Solution.

Just leave it alone, it will sort itself out after a few days, its best not to get the helpdesk involved, as there is nothing wrong with your connection, its just the normal period of settling in when the tline is upgraded.
Its best not to restart or disconnect it for at least 10 days, otherwise you will end up with a much slower speed.
ADSL2+ is uses more bandwidth, so its important to keep the distance from the point where your line comes in, to the home hub, as short as possible, and have a filter at the point it enters the house, so that the broadband signal does not go down the extension wiring.
The ideal solution is a filtered faceplate at the master socket, that will ensure that you get the fastest connection speed.
Like this http://forumhelp.dyndns.info/images/adslface.jpg
or this
http://forumhelp.dyndns.info/images/newnte.jpg
Some of the older microfilters are not as effective at stopping the higher frequency ADSL2+ signals from getting into your phone circuit, which is most likely why you were asked to change them.
There are some useful help pages here, for BT Broadband customers only, on my personal website.
BT Broadband customers - help with broadband, WiFi, networking, e-mail and phones.

High Noise Margin

Hi there,
It seems like my line has been changed to a different profile with the Downlink Noise Margin Target being set to 10dB.
I'd like to have it back to 6dB as before. I've lost over 0.6Mbps and my speeds weren't exactly that high to begin with!
Many thanks!
1. Product Name: HomeHub4
3. Firmware version: v0.07.01.0910-BT (Type B) Last updated 21/1/2015
4. Board version: 01A
5. DSL uptime: 3 days, 09:19:23
6. Data Rate: 711 / 2203
7. Maximum Data Rate: 724 / 2404
8. Noise Margin: 5.5 / 10.3
9. Line Attenuation: 35.0 / 51.5
10. Signal Attenuation: 34.9 / 55.8
11. Data sent/received: 192.8 MB / 3.9 GB
13. BT Wi-fi: No
14. 2.4GHz wireless network/SSID: BTHub4-Z6FQ
15. 2.4GHz wireless connections: Enabled (802.11 b/g/n (up to 144 Mb/s))
16. 2.4GHz wireless security: WPA & WPA2 (Recommended)
17. 2.4GHz wireless channel: Automatic (Smart Wireless)
18. 5GHz wireless network/SSID: BTHub4-Z6FQ
19. 5GHz wireless connections: Enabled (802.11 n (up to 300 Mb/s))
20. 5GHz wireless security: WPA2 Only
21. 5GHz wireless channel: Automatic (Smart Wireless)
22. Firewall: Default
23. MAC Address: 18:
24. VPI/VCI: 0/38
25. Modulation: G.992.3(ADSL2)
26. Latency type: Fast
27. Software variant: -
28. Boot loader: 0.4.3-BT (Mon Jun 9 14:23:56 2014)

Hi HaoForNow,
Thanks for posting and welcome back!
Sorry for the connection problems you were having with your broadband. Great to see everything has been stable over the last 3 days. I'll help reset the profile to reduce the noise margin and push your connection speed in the right direction ^^^
Click on my username and under the "about me" section of my profile you'll see the link to send us your details.
Cheers,
Robbie
BTCare Community Mod
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High noise margins

Hi all, (nearly) a first time poster and am having SERIOUS issues with BT Broadband.
I was with Sky for ages but migrated to BT, I had consistant and steady speeds with Sky of 4.5 to 5.5 mb.
I had a recent loss of connection (towards the end of my 10 day "settling" period) and the full connection went down soon after and 5 days later re-connected me, the line is noisy to the ear, BT have conducted tests and they say all is fine, I even hear the modem noise connecting if I'm on the phone.
I've checked all sockets, am using the master(there is no test socket in my box, there is no "bell" line connected). I'm on the Hartlepool exchange so don;t know if that has been recently upgraded to the 21CN, if so would this cause any of my problems??
I've have checked everything at my end that could cause excess noise, have removed phones, Sky+box etc.. and still a crappy connection, any ideas guys n gals?? Thanks
Stats below:
ADSL line status
Connection Information
Line state
Connected
Connection time
0 days, 00:00:31
Downstream
575 Kbps
Upstream
888 Kbps
ADSL Settings
VPI/VCI
0/38
Type
PPPoA
Modulation
G.992.3 Annex A
Latency type
Interleaved
Noise margin (Down/Up)
12.5 dB / 9.6 dB
Line attenuation (Down/Up)
49.1 dB / 27.8 dB
Output power (Down/Up)
4.4 dBm / 1.3 dBm
Loss of Framing (Local/Remote)
0 / 0
Loss of Signal (Local/Remote)
0 / 0
Loss of Power (Local/Remote)
0 / 0
FEC Errors (Down/Up)
0 / 0
CRC Errors (Down/Up)
0 / 32
HEC Errors (Down/Up)
0 / 0
Error Seconds (Local/Remote)
0 / 0

when you say the line is noisy have you tried the quiet line test preferably with a corded phone in master socket - dial 17070 and option 2 - you should hear nothing
your exchange has been upgraded to 21CN and you are currently on adsl2 with modulation of 992.3
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Can anyone help? High noise margin and low sync sp...

Hi all,
just registered on the forum so this is my first post. Hopefully someone out there can help.
I transferred my broadband to BT from Sky. With Sky my sync speed was around 4000kbps and download of about 3500kbps. I had a Netgear router with Sky but for some reason every day or so my sync speed dropped to 2500kbps and download down to 1800kbps. I had to reboot the router to get the speeds back up again, very frustrating.
I got BT broadband on 20/1/2010, set everything up and also fitted an I-plate. I noticed that line attenuation was 46db, this was previously 50.5 with sky and prior to I plate. The home hub sync was at 7200kbps at the start which i was very pleased with. I know this DLM thing is active for the first 10 days or so and speedtests during this time are not exactly accurate but still I was happy. after 3 days i did a speed test and got download of 5800kbps, chuffed to bits!
But, after 2 days at that speed the sync dropped to 2176kbps, gutted. I have only rebooted the router 3 times since the service started and each time the sync goes back to 7000kbps ish but drops again a day later. The thing I dont understand is the noise margin. Its currently at 24.5db, isnt that awfully high? Why is this? when I reboot it drops to 8-9db ish but then goes up again with the speed dropping.
currently connected to test socket, no other telephone equipment connected to any extensions
Can anyone please help/advise whats going on or how to rectify it? I'm wondering if theres a line fault somewhere.
And with attenuation at 46db I would have thought the speed could well be much higher than 2200kbps.
I'll stop babbling now,
Thanks

whitesp wrote:
Thanks for your reply Somerled,
ok so something is causing noise at a particular time, i had wondered about the quality of the home wiring, there are 4 extension sockets in the property, but again i am currently only connected to the test socket.
I dont have the old netgear router unfortunately so can't follow up on the suggestion you made.
God this is gonna be a nighmare to track down, although come to think of it I do have a dimmer on quite close to where the master socket is.
Can we say for sure that there definitely IS a source of noise/interference??
Many thanks
SOMETHING is forcing a resync, and at a low speed. The only thing that would cause that is a prolonged burst of noise.This is known to BT technicians as "REIN" (Repetitive Electrical Impulsive Noise). No point trying to get BT to investigate at this stage though, as it sounds very intermittent.
The way to spot radio interference noise is to use a suitable receiver - and the most convenient is a portable medium wave transistor radio. Tune to a quiet spot at the lowest end of the scale, and turn up the volume. All you'll hear is white noise and the occasional quiet crackle. A burst of noise strong enough to affect the DSL signal will be unmistakeable - a LOUD crackling/buzzing/rasping noise. If that coincides with a resync, you've found it. You then have to figure out what electrical device caused the noise.....
Another possible source of DSL noise problems is less obvious - noise caused by a line fault. This causes an unwanted mixing of the phone and DSL signal in a way that can't be corrected by the filters. This will have much the same effect as external interference noise.
Check this : does the router resync when the phone rings, or when the phone is in use ? If it does, then we're on to something - a fault known as an "HR" (High Resistance). If that doesn't happen, then we are back to external radio interference as the cause.
I suppose the HV lines you mention might have some effect, but it's a bit of a long shot. I'd expect noise from them would be a bit more constant, and would cause problems all the time, rather than intermittently.

Is my downstream noise margin too high?

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