Noise Margin Increase

I've been here before, but now the problem is more noticeable.
Due to many disconnects recently my ADSL2 noise margin has been increased to 6.0 dB.
The result is that the speed profile has been reduced to 14330 kbps, from around 18000 kbps, originally. Actual speed is 12200 down / 900 up. Noise margin fluctuates between 5.9 and 6.1 down and up.
I saw this problem on a friend's BT Broadband some time ago, and replaced her hub. This solved the problem. Hence I have no spare BT hub.
Moreover, is this noise margin setting likely to be permanent, or will the speed recover slowly? The line seems to be stable, but CRC errors are high.
ADSL line status
Connection information
Line state
Connected
Connection time
6 days, 6:03:46
Downstream
14,332 Kbps
Upstream
1,164 Kbps
ADSL settings
VPI/VCI
0/38
Type
PPPoA
Modulation
ITU-T G.992.5
Latency type
Interleaved
Noise margin (Down/Up)
5.9 dB / 5.9 dB
Line attenuation (Down/Up)
18.5 dB / 6.1 dB
Output power (Down/Up)
0.0 dBm / 12.6 dBm
Loss of Framing (Local)
12
Loss of Signal (Local)
1
Loss of Power (Local)
0
FEC Errors (Down/Up)
14839070 / 0
CRC Errors (Down/Up)
9331 / N/A
HEC Errors (Down/Up)
N/A / 0
Error Seconds (Local)
1619
Software version 8.1.H.U | Time and date 10:13:01 30/03/2013

imjolly wrote:
if the increase in noise margin was caused by disconnections was that the router dropping connection or manual reset say due to work in your home? if whatever caused it is now solved then I would just leave it
from your stats the line looks stable and not a great deal of errors for 6 days connected. if you remain connected then the noise margin should go back to 3db automatically but may take some time. you could always ask the mods to reset to 3db but that will increase the crc/hec errors
Thanks,
You may have seen some of my recent mild rants and complaints.
BT support in India arranged for a reset last weekend, and the noise margin dropped to 3dB. (Good reponse from India). This lasted 12 hours, and then the hub tripped again, overriding the Power Save at 3.00 am Monday (there were no mains supply failures) . Hence the return to 6dB, but with a better speed which had been down to 8000 kbps.
The hub is always left switched on.
I now have a new (spare) Netgear Hub and if there are any more problems I will install it.
Don't want to pester the mods too much.

Similar Messages

Bt Infinity noise margin

The Home hub 5 resynced at the default values of 6 but I have noticed recently the noise margin increasing on the downstream. The sync rate did increase on a re-sync but went back to the values they are now. I have attached a graphs showing spikes from 15:37 when using the ringback feature on a 17070 call and have checked and their is no noise using the quiet line test. I would like your advice on how to fix this issue please.
Current stats:
1. Product name:BT Home Hub
2. Serial number:+068343+NQ40904025
3. Firmware versionoftware version 4.7.5.1.83.8.173.1.6 (Type A) Last updated Unknown
4. Board version:BT Hub 5A
5. VDSL uptime:3 days, 01:26:06
6. Data rate:8453 / 43924
7. Maximum data rate:10510 / 52439
8. Noise margin:6.1 / 8.1
9. Line attenuation:0.0 / 23.6
10. Signal attenuation:0.0 / 21.2

So you do have one like this?
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If not, I'll try again

Why does my noise margin start off at 6.3dB then d...

Basically every time my modem is reset, the noise margin is 6.3dB and then after that, each day it drops off another 0.1-0.3 until it gets to 5.4dB why is that ? Obviously The reason I ask is, if it gets too low it will reset my modem by itself won't it? Could the modem be the reason.

this is what i mean guys, i know that one of them is 5.9 and the others 5.8 but why is there so much of a difference
non interleaved- http://gyazo.com/40d6ce989f2e6aad93e2ac53d0391fb5
interleaved- http://gyazo.com/ed752dd4dd109e63c72aea0357209b68
these are also pretty close and look at the difference
interleaved- http://gyazo.com/ee5da83220e8fc541577eee19fee26a1
non interleaved- http://gyazo.com/986ee7fafc206a50d368afbeda9150b9
the bottom two are slightly different but why such a big gap?
why when none interleaved the max is a lot lower?
if my sync speed is lower then why does my noise margin not increase rather than decrease and not rise back up?

Noise Magin increasing every week

Around 2 weeks ago my line was changed by BT and the speed went from 40KB/s to 450KB/s, they said it was unstable so did some work on it over a day or two.
However, every time I leave the router plugged in for more than 5 days (which should stabilise the line?) seems to cause the noise margin to increase and the speed to go down. After 1 week it dropped from 4.5Mb/s to 3.8Mb/s, then after another week it has dropped to 3.1Mb/s and I fear it will keep dropping in this fashion. The noise margin is currently at 5.3 dB.
Is there anything I can do, or will I need to call/e-mail BT to sort out the problem
Thanks

The noise margin was about 2.3dB
and here are the stats from a line test, although the line test will not run for our actual phone number, it will run for our old one which I believe is the same line. But in the past the line tests have not always proved reliable
Test1 comprises of two tests
1. Best Effort Test: -provides background information.
Download Speed
2503 Kbps
0 Kbps
4000 Kbps
Max Achievable Speed
Download speedachieved during the test was - 2503 Kbps
For your connection, the acceptable range of speedsis 1200-4000 Kbps.
Additional Information:
Your DSL Connection Rate :3187 Kbps(DOWN-STREAM), 824 Kbps(UP-STREAM)
IP Profile for your line is - 2500 Kbps
The throughput of Best Efforts (BE) classes achieved during the test is - 20.68:18.06:61.27 (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
672 Kbps
0 Kbps
824 Kbps
Max Achievable Speed
>Upload speed achieved during the test was - 672 Kbps
Additional Information:
Upstream Rate IP profile on your line is - 824 Kbps

Netgear noise margins

I've swapped out the Hub for my Netgear DG834G but although the sync is good the noise margin drops from 3 during the day to 0 to -1 after about 18.00 hrs, I've rebooted a couple of times and each time the sync has dropped but I can't get the noise margin to increase.
Any ideas please .
Del.

the dgteam firmware gives more options but not sure about v3. The v2 update I did gave a bit more information but not ability to alter my noise margin. However the dg834pn I use with dgteam firmware allows me to negotiate my noise margin + or -. currently mines is set at 75% to drop my NM and increase my sync
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Noise margin - Infinity 2

Folks, apologies if this question's been asked already - but can noise margin be reset or lowered on an Infinity 2 connection?
With our old ADSL line, and Billion Bipac 7800n router, I know we could lower it ourselves or ask the ISP to do it. But I can't seem to telnet into the HH5 and after reading some of the previous forum postings I'm not sure BT Openreach allow this? We had a steady noise margin of 6db on our old ADSL, however I see from the stats in the HH5 that it's currently 6.5. I know it's not much, but I was wondering if it could be lowered manually and I could get optimal speeds.
Or does Infinity/VDSL work in different ways?
Cheers!

Regrettably I do not think this can be changed by the customer or BT Wholesale. If the noise margin becomes really silly (e.g. 10dB on infinity) you can try to get it reset but it requires a BT Openreach engineer with a job number for your line and persistence on his part.
I think the target should be around 5.9-6.0dB and at 6.5dB you are only slightly above this so close to maximum bandwidth. I'm guessing 6.5dB is a current rather than average figure, so it may be at some points during the day the noise on the line has increased and so your current noise margin. Also bear in mind that depending on the chipset in your modem the noise figure may be more of an estimate than an actual measurement. However the high noise margin may be due to the BRAS profile so you have my sympathy as in my opinion 'the system' limits the sync rate rather too aggressively.

Noise Margin Query

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
Solved!
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
BTCare Community Mod
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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 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
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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
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If someone answers your question correctly please let other members know by clicking on ’Mark as Accepted Solution’.

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

Fault rectified, but still high Noise margin and a...

Hi, I had a fault on my dropwire from the pole causing crackling on the line, of which caused my broadband to drop constantly and increase my noise margin to 13db, from the previous 6db. This caused my broadband speed to drop from 2.5Mb down to 1.05. The engineer when he replaced the drop wire and replaced my socket with a new Openreach one with a built in filter (the infinity one) said I just need to phone BT and get put through to second level support who can drop the target SNR. After many many many phonecalls to bt technical, they refuse to drop my target snr, and refuse to pass me on to second level support who can action this! Can anyone help me on here, as my fuse is getting very short!
Current Line Stats :
ADSL Line Status
Connection Information
Line state:
Connected
Connection time:
0 days, 00:10:01
Downstream:
1.156 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):
13.4 dB / 8.0 dB
Line attenuation (Down/Up):
63.0 dB / 31.5 dB
Output power (Down/Up):
16.8 dBm / 11.9 dBm
FEC Events (Down/Up):
185 / 2
CRC Events (Down/Up):
19 / 5
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):
44 / 0
Error Seconds (Local/Remote):
4 / 1

ADSL Line Status
Connection Information
Line state:
Connected
Connection time:
4 days, 06:03:56
Downstream:
1.188 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):
11.5 dB / 8.0 dB
Line attenuation (Down/Up):
62.8 dB / 31.5 dB
Output power (Down/Up):
16.6 dBm / 11.9 dBm
FEC Events (Down/Up):
1289 / 719
CRC Events (Down/Up):
131 / 14
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):
234 / 6
Error Seconds (Local/Remote):
118 / 11

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.

Could my noise margin be causing slower speeds?

Every so often i keep noticing that my noise margin keeps rising and my speed dropping, what would be the cause of this. My broadband never seems to work properly for any more than a month, i seem to spend most of my time trying to sort out problems with my broadband. Any help would be much appreciated.
Line state
Connected
Connection time
16 days, 19:43:10
Downstream
1,088 Kbps
Upstream
448 Kbps
ADSL settings<script type="text/javascript"></script>
VPI/VCI
0/38
Type
PPPoA
Modulation
ITU-T G.992.1
Latency type
Interleaved
Noise margin (Down/Up)
21.8 dB / 15.0 dB
Line attenuation (Down/Up)
58.0 dB / 31.5 dB
Output power (Down/Up)
15.8 dBm / 12.5 dBm
Loss of Framing (Local)
318
Loss of Signal (Local)
810
Loss of Power (Local)
0
FEC Errors (Down/Up)
302497 / 2550
CRC Errors (Down/Up)
5039 / 2147480000
HEC Errors (Down/Up)
nil / 1749
Error Seconds (Local)
7467
<script type="text/javascript"></script>
Hide Details

with 16 days connected your is stable but your noise margin is very high at 21.8 as normal is about 6. I would be hoping for a connection speed of about 2.5/3mb with your connection.
fill up the form and ask the mods to reset your noise margin back to normal 6 and this should increase your speed then just leave it connected http://bt.custhelp.com/app/contact_email/c/4951
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Understanding Noise Margin

I am currently still in 'training mode' for my adsl2+, ends tomorrow the upside is the IP profile has increased to 5000 from 3000 so that's a step in the right direction.
But what I am failing to understand is the noise margin, I 'work' from home and checking the Hub info in the morning the noise margin is anywhere between 9.2 & 10.2. Late afternoon this has decreased to below 9, then during the evening it will continue to decrease, the lowest I have seen so far is 7.2. But in the morning it's back up again, whilst I appreciate that this can fluctuate there does appear to be a pattern, so will it settle? or is it going to continue to fluctuate.
Hub is plugged into master, and is on 24/7, the 17070 noise test produces nothing no clicks, no hiss.
Solved!
Go to Solution.

geaves wrote:
I am currently still in 'training mode' for my adsl2+, ends tomorrow the upside is the IP profile has increased to 5000 from 3000 so that's a step in the right direction.
But what I am failing to understand is the noise margin, I 'work' from home and checking the Hub info in the morning the noise margin is anywhere between 9.2 & 10.2. Late afternoon this has decreased to below 9, then during the evening it will continue to decrease, the lowest I have seen so far is 7.2. But in the morning it's back up again, whilst I appreciate that this can fluctuate there does appear to be a pattern, so will it settle? or is it going to continue to fluctuate.
Hub is plugged into master, and is on 24/7, the 17070 noise test produces nothing no clicks, no hiss.
noise margin snr snrm
Quote:
On virtually all lines the background noise rises as the sun falls and falls again as the sun rises. This mainly due to the effect the sun has on the radio-reflecting layer of the atmosphere, particularly medium-wave signals. So the noise margin (SNRM) will fall near dusk and not fully recover till well after dawn. Other causes are covered in Miscellaneous Nasties on the Troubleshooting pages.
The effect of this higher background noise at night is that if a connection is made at these times the sync speed will be lower than in the daytime when the noise is lower.
"I have this awful feeling someone is watching every move I make (one of my pet hates is router location tagging)." Marvin (A paranoid Android)

Noise Margin Increase

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