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.

Similar Messages

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

BT Infinity 2 Noise Margin

My noise margin is:
8. Noise margin:
5.8 / 5.9
Is that bad, and is that the reason i've been getting ping spikes?

gg30340 wrote:
You need to show all the stats from 1-12 so that it can be seen in context.
1. Product name:
BT Home Hub
2. Serial number:
+068343+NQ34341979
3. Firmware version:
Software version 4.7.5.1.83.8.173.1.6 (Type A) Last updated 15/01/14
4. Board version:
BT Hub 5A
5. VDSL uptime:
0 days, 03:33:05
6. Data rate:
14833 / 70867
7. Maximum data rate:
14747 / 69943
8. Noise margin:
5.9 / 6.3
9. Line attenuation:
0.0 / 18.5
10. Signal attenuation:
0.0 / 18.4
11. Data sent/received:
140.3 MB / 3.0 GB
12. Broadband username:
[email protected]

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?
If you found this post helpful, please click on the star on the left
If not, I'll try again

Difference between noise margin and noisy line

Hi
This issue has always bugged me. Am transferring to BT Infinity next week from Sky and have mixed feelings. We live a fair way from the exchange so line attenuation is a problem but we mange to get 3.5-4Mb with absolutely zero outage using the Sky unlimited package. Our current router stats are posted below and I woud be grateful for your interpration of the noise margin figs. Is the 7db download commensurate with a quite and stable connection that bodes well for Infinity? I'm curious cos our phone line is noisy with much background niose despite the fact that we don't have any fancy gadgets and use filters just about everywhere.
I'd just like your views on noise on the line versus noise margin for broadband and how each might impact on Infinity when we're connected next week.
Many thanks for your time.
Router StatisticsSystem Up Time: 05:44:16
Port Status TxPkts RxPkts Collisions Tx B/s Rx B/s Up Time
WANPPPoA
403055
369851
0
14261
13203
05:42:39
LAN100M/Full
370239
415781
0
13527
14890
05:44:11
WLAN11M/54M
8864
0
0
150
0
05:43:58
ADSL Link Downstream Upstream
Connection Speed4093 kbps
796 kbps
Line Attenuation51 db
28 db
Noise Margin4 db
14 db

Enter your attenuation here http://www.kitz.co.uk/adsl/max_speed_calc.php
Results are approximate
If any post helps tick the star box on the left
Just cause Im paranoid dont mean they are not out to get me

Help with resetting DSLAM/boosting noise margin?

I hope that by posting here I may actually get some help on my issue.
Had my BT Infinity 2 installed last week after a missed appointment (contractor), and got some helpful Openreach guys in, first last Monday to install the phone line - all went well, one pair was missing somewhere but a second OR engineer managed to solve this, told me I had a clean line.
On Thursday the fibre guys turned up, bit of hassle getting the HH5 to sync over the Data Extension Cable but got there in the end - seems the phone guy had done all the work and the line was working fine, no CRC errors, not far from the cabinet, a clean line.
However, the online fibre checker originally told me (and still does) that my estimated speed is 60-79 downstream and 19-20 upstream.
I am syncing at around 58Mb/s down but only just below 12Mb/s up - the HH5 has trained at this and it had been in and out the socket a few times on the Monday and again on the Thursday (same speed whether plugged in at the master socket or at the end of the DEC, I know this cable makes no difference anyway) - the fibre guys told me I have to get in touch with my provider (BT) to perhaps have the DSLAM reset as the auto sensing equipment at the exchange might have reduced my speed having been switched on and off so many times.
I know that the checker is just an estimate but it didn't say between 10 and 20 Mb/s, it is quite clear about the estimate of 19-20Mb/s - this was a major factor in me leaving the local cable company as I was already getting 10Mb/s upstream with them anyway. In this respect I am thinking that the (just under) 12Mb/s seems quite low.
So after phoning the customer service line a couple of times and despite being told to disconnect the router from the "white box" - I assume they mean the old Openreach modem - and getting nowhere as I insisited I don't have that and only have the new HH5, I composed a precise email detailing all of the above, and what do I receive back? This pearl of wisdom from someone in "Digital Care"...
"Dear Sir,
This is in regards to your e-mail which you have sent regarding the issue you are facing with your e-mail. I tried to call you to help you regarding your issue but could not speak with you."
Oh dear, did they actually read and understand my query - I also mentioned in my email that I could be contacted on my mobile number (given in the email, and on record as my installation was being handled by a specialist team after the missed appointments) as I do not have a telephone attached to my landline at the moment, or by email.
Now I run my own small computer repair business and am a professionally trained I.T. Consultant so I am 100% certain there is no problem on my end, how on earth do I go about getting this looked at because I feel like I am going round in circles? I don't think I can face another screen reader in India telling me to unplug my "white box"....
The noise margin seems quite low, can this be boosted - I must be between 150m and 250m from the cabinet according to the fibre guys.
Here's the relevant data from this morning:
3. Firmware version:       Software version 4.7.5.1.83.8.173.1.6 (Type A) Last updated Unknown
4. Board version:              BT Hub 5A
5. VDSL uptime:                1 days, 02:37:11
6. Data rate:       11869 / 58115
7. Maximum data rate: 11807 / 57862
8. Noise margin:               6.0 / 6.1
9. Line attenuation:         0.0 / 20.9
10. Signal attenuation:   0.0 / 19.9
and just taken now:
3. Firmware version:   Software version 4.7.5.1.83.8.173.1.6 (Type A) Last updated Unknown
4. Board version:   BT Hub 5A
5. VDSL uptime:   1 days, 10:16:36
6. Data rate:   11869 / 58115
7. Maximum data rate:   11793 / 56714
8. Noise margin:   6.0 / 5.8
9. Line attenuation:   0.0 / 20.9
10. Signal attenuation:   0.0 / 19.9
Thanks in advance for any help!

Thanks for the quick reply.
Here's the info:
Featured ProductsDownstream Line Rate(Mbps)Upstream Line Rate(Mbps)Downstream Range(Mbps)Availability Date High Low High Low
FTTC Range A (Clean)
79.5
60
20
19.6
Available
FTTC Range B (Impacted)
70.9
43.8
20
13.9
Available
WBC ADSL 2+
Up to 7
4 to 12.5
Available
WBC ADSL 2+ Annex M
Up to 7
Up to 1
4 to 12.5
Available
ADSL Max
Up to 5.5
4.5 to 8
Available
WBC Fixed Rate
2
Available
Fixed Rate
2
Available
Other Offerings
Fibre Multicast
Available
Copper Multicast
Available
As you can see my upstream is lower than the "low" impacted figure, and I was told by both the phone and fibre Openreach engineers that my line is clean with no CRC errors.
I'm not a business user.

Noise Margin clearifaction pls

Hiya all,
   the other day i posted regarding my infinity 2 connection about uploads speeds, that subject is now cleared and ive accepted it.
But someone was talkin about noise margin so ive been checking it regularly and because the women at tech support said to keep an eye on it over the next few days since she phoned me on wednesday.
the folliowing is what the HH5 says is this cause for concern?
3. Firmware version:
Software version 4.7.5.1.83.8.173.1.6 (Type A) Last updated Unknown
4. Board version:
BT Hub 5A
5. VDSL uptime:
2 days, 00:06:07
6. Data rate:
8615 / 73208
7. Maximum data rate:
8556 / 61787      <<<< lower than my data rate?
8. Noise margin:
5.8 / 4.3          <<<< alot lower than it was b4 being 5.8 / 6.4?
9. Line attenuation:
0.0 / 19.0
10. Signal attenuation:
0.0 / 19.0
11. Data sent/received:
787.1 MB / 2.2 GB
my downloading seems fine, sometimes it lags and then resumes like download speed spiking if that makes sense?
Solved!
Go to Solution.

3. Firmware version:
Software version 4.7.5.1.83.8.173.1.6 (Type A) Last updated Unknown
4. Board version:
BT Hub 5A
5. VDSL uptime:
2 days, 00:06:07
6. Data rate:
8615 / 73208
7. Maximum data rate:
8556 / 61787      <<<< lower than my data rate?
8. Noise margin:
5.8 / 4.3          <<<< alot lower than it was b4 being 5.8 / 6.4?
9. Line attenuation:
0.0 / 19.0
10. Signal attenuation:
0.0 / 19.0
11. Data sent/received:
787.1 MB / 2.2 GB
Hi there,
Your noise margin has dropped below the target of 6 for the downstream (If you were to reboot the router now it would sync at a lower rate to up the noise margin - or it might resync on it's own to try and stabilise the connection)

Noise margin and orange light flashing on hh5

Hi, I've had infinity 2 installed by an engineer a week ago and since then I have seen the hub disconnect lots of times and the orange power light flashes from anywhere between a minute and and hour with no internet access.
I have checked the stats and I've got a noise margin of 6.1/6.6!! Could this be the reason why I cannot get a stable connection? What can be done about it?? Confused!!!!

Hi Dantheman22,
Please use the 'contact the mods' link in my forum profile under the 'about me' section to send in your details and we'll sort out an engineer visit for you. You can find the link by clicking on my username.
Thanks
Neil
BTCare Community Mod
If we have asked you to email us with your details, please make sure you are logged in to the forum, otherwise you will not be able to see our ‘Contact Us’ link within our profiles.
We are sorry but we are unable to deal with service/account queries via the private message(PM) function so please don't PM your account info, we need to deal with this via our email account :-)
If someone answers your question correctly please let other members know by clicking on ’Mark as Accepted Solution’.

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

Question about Noise Margin and Line Attenuation a...

1.       For several years I have had a BT telephone line. From the utilities provided by http://www.kitz.co.uk/adsl I find that I am connected to the Exchange at Merton Park (BT Code: LSMEPK) Distance:-   Direct:   960 metres (appx)* By Road: 1.29 km. Exchange Status ADSL enabled: March 30, 2000 DSL Max enabled:   March 30, 2006 SDSL enabled : Enabled 21CN due : (PSTN) N/A 21CN WBC (Broadband)   Enabled 15.02.09
2.       I previously had broadband from UKOnline and used a Speedtouch 570 adsl modem. I was paying £9.99 for a speed of 1MBit/s – in practice 700K – which was fine for most purposes but BBC iplayer did struggle a bit. UkOnline has been taken over by SKY so I switched to BT Total Broadband Option 3 in mid December, and initially used the Speedtouch 570 as there were delivery delays on BT Home Hub 2.0 due to weather conditions. Speed was initially very good but did not measure it.
3.       After Xmas I set up the BT Home Hub and ran a speed test - the profile was 2.5MBit/s. I was disappointed to get less than 3Mbit/s which is needed for BBC iplayer HD.
ADSL line status
Connection information
Line state Connected
Connection time 0 days, 2:26:57 ------> 6th January 2011
Downstream 2,268 Kbps
Upstream 440 Kbps
ADSL settings
VPI/VCI 0/38
Type PPPoA
Modulation ITU-T G.992.5 ---à this apparently means ADSL2+
Latency type Interleaved
Noise margin (Down/Up) 15.7 dB / 31.9 dB
Line attenuation (Down/Up) 27.0 dB / 9.7 dB
Output power (Down/Up) 0.0 dBm / 12.7 dBm
Loss of Framing (Local) 22
Loss of Signal (Local) 3
Loss of Power (Local) 0
FEC Errors (Down/Up) 6512 / 0
CRC Errors (Down/Up) 0 / 2147480000
HEC Errors (Down/Up) nil / 0
Error Seconds (Local) 2
4.       As part of the “slow speed wizard” I looked into getting the accelerator plate for my NTE5 split face master socket available for postage only (£1.20) but the web form advised me that if I proceeded with this order the broadband contract would automatically be extended by 12 months. I checked my BT internet account and was surprised to find an email (23rd Dec 2010) advising me that as an Option *1* customer I was in danger of exceeding my usage allowance – which surprised me as I am definitely Option 3. I wondered if I had had the speed throttled. Therefore phoned BT accounts who said the email was a mistake - I am Option 3, also said that accelerator plate was unlikely to make a difference.
5.       I contacted the BT call centre who talked me through various options. Plugging the hub direct into the master socket made no difference. They also ran a line test and said the line was fine.
6.       I therefore browsed the community care forum and find that disappointing speeds are not uncommon. One of the threads mentioned disconnecting the bell wire on the extensions. I follow this advice and removed line 3 on all extensions and then checked the ADSL status on the hub.
ADSL line status
Connection information
Line state Connected
Connection time 0 days, 6:33:45 10th January 2011
Downstream 2,272 Kbps
Upstream 888 Kbps
ADSL settings
VPI/VCI 0/38
Type PPPoA
Modulation ITU-T G.992.5
Latency type Interleaved
Noise margin (Down/Up) 31.8 dB / 14.4 dB
Line attenuation (Down/Up) 27.0 dB / 9.7 dB
Output power (Down/Up) 0.0 dBm / 12.3 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 / 0
Error Seconds (Local) 0
7.       This had a dramatic improvement on Upstream speed – and a big change to the noise margin Noise margin which had been (Down/Up) 15.7 dB / 31.9 dB and is now Noise margin (Down/Up) 31.8 dB / 14.4 dB. It did not improve the download speed.
8.       In the following days the BT hub has not been particularly stable with some intermittent loss of wireless connectivity every few hours. Examining the event log I was a bit disconcerted to see alterations to firewall settings had happened (which I hadn’t made) and resets which I am pretty certain I hadn’t made – and a userid login with a name like TR69. Perhaps these are occasioned by the BT speedtester? To be fair I had reset and powered off the hub a number of times in attempt to sort out this problems.
9.       I have switched to a Netgear DG83GT (V1.03.23) for the time being until I have what I can regard as a reasonably fast stabile connection. At the time of writing this has been stable for 20 hours DownStream Connection Speed 2268 kbps UpStream Connection Speed 888 kbps.As stated earlier I would like downstream to be faster.
The perceived wisdom on the forum seems to be that several days of complete stability are required if there is to be any improvement on speed.
10.   If a moderator or anyone with the relevant experience reads this I would be very grateful for answers to the follow questions:
A.      Is the change in the Noise Margin parameter a good thing or a bad thing?
B.      Are the line attenuation figures acceptable for a distance of under 1.5kilometres to the exchange?
C.      Should I be able in theory to get a faster speed i.e. downstream 3Mbit/s?
D.      From the forum it seems to take several days for speed adjustments to be effected or to take effect – is this a technical issue or a policy issue?
Many thanks.
Robert
Solved!
Go to Solution.

Good Morning - it is now 6 days since this posting. During this time there have been 2 resets of the adsl line
Fri, 2011-01-14 03:28:43 - LCP down.
Fri, 2011-01-14 03:28:54 - Initialize LCP.
Fri, 2011-01-14 03:28:54 - LCP is allowed to come up.
Fri, 2011-01-14 03:28:54 - CHAP authentication success
and
Sun, 2011-01-16 16:37:26 - LCP down.
Sun, 2011-01-16 16:37:36 - Initialize LCP.
Sun, 2011-01-16 16:37:36 - LCP is allowed to come up.
Sun, 2011-01-16 16:37:36 - CHAP authentication success
These were not initiated by me - and since noise margins and sync speeds changed as a consequence can I assume that this is evidence of the adaptive process working?
Secondly, as you can see, the noise ratio has vastly improved as have the upstream and downstream sync speeds
        System Up Time 157:54:52
      ADSL Link          Downstream          Upstream
      Connection Speed           11199 kbps           1091 kbps
      Line Attenuation           27.0 db           9.9 db
      Noise Margin           14.8 db           9.2 db
BUT from the BT speedtester, as shown below I seem to be stuck in a banded IP profile of 1750/1091 which is very different from the downstream sync speeds of 11199 Kbps(DOWN-STREAM)
Can BT staff take action to alter this? If they can how do I contact them?
Regards,
Robert
18th Jan 2010
Download Speed    1288 Kbps
0 Kbps   2000 Kbps
Max Achievable Speed
Download speedachieved during the test was - 1288 Kbps
For your connection, the acceptable range of speedsis 800-2000 Kbps.
Additional Information:
Your DSL Connection Rate :11199 Kbps(DOWN-STREAM), 1091 Kbps(UP-STREAM)
IP Profile for your line is - 1750 Kbps
The throughput of Best Efforts (BE) classes achieved during the test is - 2.28:10.77:87.0 (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       896 Kbps
0 Kbps   1091 Kbps
Max Achievable Speed
>Upload speed achieved during the test was - 896 Kbps
Additional Information:
Upstream Rate IP profile on your line is - 1091 Kbps

New phone line and broadband, massive noise margin...

Hi, being a long time DSL stalwart a recent move to a new property has meant I've needed to switch over to ADSL instead and thus far it's proving to be a bit of a mare!
I waited a month for the initial installation engineer who promptly never showed anyway, no bother I thought, the hub turned up and I installed it myself and it promptly didn't work It soon became pretty apparent that the phone line was completely dead even from the test socket. A few phone calls later and the phone line is working much to my delight. The broadband is another story though, initially it still couldn't connect but later in the day it managed to get going. However it's excruciatingly slow with an average of 20 to 30kps throughput and substantial packetloss. Also worth noting is that in this new property, only the master socket actually works, this place has 4 other sockets dotted around all of which appear to be dead, could these be part of the issue? Does using the test socket completely cut these out and rule out bad wiring? Just to add, at 13 hours connected the adsl status is pretty much the same and I couldn't notice anything on the BT line noise test number.
I'm not familar with the workings on ADSL lines but I'm guessing the root of the problem is down to a wildly varying noise margin both up and down. Down fluctuates between ~2 and 20 within a matter of seconds and up gives some numbers that defy belief. Now the line was originally activated on Wednesday, actually kicked into life sometime on Friday and the router has been connected for 13 hours now, whilst it's still early days and things should bed in more, I assume I'm right in thinking I should be alarmed at how bad a line I'm starting out with? And should I be directing my ire at the builders or BT?
Any help and suggestions will be hugely appreciated!
Cheers!
Solved!
Go to Solution.

as it is a newbuild is the master socket inside your home or outside like this
connecting to the test socket will eliminate all your extension sockets and should be your best connection. if you are not in the test socket could you try it and post new stats please
with your attenuation I would expect a connection speed of about 18mb when you get this fiixed
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Please can I have my Noise Margin lowered *again*

Message sent to StephanieG, who was very helpful last time.
Please can I have my noise margin lowered back down to 6 again?
Although it is plugged 24/7 into the test socket, it has crept up again over the last 6 weeks, until another disconnect 10 minutes ago.
Maybe BT would consider, in future HH firmware updates, allowing users to negotiate their own SNR margin, without having to go through this forum?
Cheers,
Tim
ADSL line status
Connection information
Line state
Connected
Connection time
0 days, 0:04:13
Downstream
5,920 Kbps
Upstream
448 Kbps
ADSL settings
VPI/VCI
0/38
Type
PPPoA
Modulation
ITU-T G.992.1
Latency type
Fast
Noise margin (Down/Up)
14.2 dB / 27.0 dB
Line attenuation (Down/Up)
27.0 dB / 17.5 dB
Output power (Down/Up)
19.8 dBm / 12.4 dBm

I think it is unlikely that BT will ever update the HH to allow users to change their noise margin as it would give them even more support issues. If you wish to continue with a latency type of FAST then I suggest you invest in a router that allows you to specify the noise margin. This thread mentions 1 such router - http://community.bt.com/t5/BB-in-Home/Last-chance-saloon-really-Absolutely-fed-up/td-p/77569

How do I find noise margin etc?

Over the past few months my download speed has dropped from around 7M to around 3. Work has been going on since the start of the year to bring FTTC to the area and I assumed that this was to blame. But that work has now finished, although I personally am unable to get upgraded. I think it may now be a case of the Mods resetting my profile, but I can't seen to find the noise margin etc from my hub stats. I use HH4. Can somebody please help me with this?
Solved!
Go to Solution.

Sorry John & IMJolly, I'm not very good at this with my tablet, and have been unable to upload the results I have found, so I will attempt to type them in. Here goes.
Line stats
14.59.00, 24 Jun. (57.460000) DSL noise margin:5.90dB upstream 8.30dB downstream.
14.58.59, 24 Jun. (56.550000) DSL line rate 1084Kbps upstream 3072Kbps downstream
With regards the ADSL checker
Featured Products. Downstream. Upstream Range. Availability
WBC ADSL 2+ Up to 6. -- 4 to 8. Available
WBC ADSL2+Annex M. Up to 6. Up to1. 4 to 8. Available
ADSL MAX. Up to 5. -- 3.5 to 7.5. Available
WBC fixed rate. 2. -- -- Available
Fixed rate. 2. -- -- Available
Hope this is usable for you

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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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 ?

Noise margin - Infinity 2

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