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Aspiring Contributor
Message 1 of 4

Hign noise margin slow speed

Hi - After many years of stable connection at 7.5MBs I've recently been stuck on very much slower speeds.  I have reconnected to check if that makes any difference and rebooted the router but that hasn't changed anything.  I see no changes in speed from when the router reconnects so it appears that it isn't negotiating higher speeds as I would expect it to.  I live about 200m from the exchange so I'm used to a good and very stable connection.  The router stats are as shown below, as you can see I have a very high noise margin, the margin remains constant within 1dB either side of 17dB for days.


ADSL Line Status
Connection Information
Line state:Connected
Connection time:8 days, 07:49:06
Downstream:4.313 Mbps
Upstream:448 Kbps
ADSL Settings
Modulation:G.992.1 Annex A
Latency type:Interleaved
Noise margin (Down/Up):17.2 dB / 21.0 dB
Line attenuation (Down/Up):23.6 dB / 13.0 dB
Output power (Down/Up):19.6 dBm / 11.9 dBm
FEC Events (Down/Up):63433 / 59
CRC Events (Down/Up):2166 / 8
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):6772 / 5
Error Seconds (Local/Remote):1551 / 16
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Distinguished Sage
Message 2 of 4

Re: Hign noise margin slow speed

Hi Welcome to the forums

Here is a basic guide to getting help from the community members done by CL Keith Please read through the link posted

Have you tried the quiet line test? - dial 17070 option 2 - should hear nothing - best done with a corded phone. if cordless phone you may hear a 'dull hum' which is normal

once you have posted the information asked for then the community members can help you more

Thank You

This is a customer to customer self help forum the only BT presence here are the forum moderators

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Aspiring Contributor
Message 3 of 4

Re: Hign noise margin slow speed


Thanks for the rapid response.


I have the old style faceplate and the quiet line test was just that, quiet, absolutely no noise.  As yo can see from the speed test there is a mismatch between the max achievable speed and the IP profile for the line.


Speed test result:


1. Best Effort Test: -provides background information.

 Download  Speed
 3.21 Mbps
0 Mbps7.15 Mbps
Max Achievable Speed


 Download speedachieved during the test was - 3.21 Mbps
 For your connection, the acceptable range of speeds is 0.6 Mbps-7.15 Mbps.
 Additional Information:
 Your DSL Connection Rate :4.42 Mbps(DOWN-STREAM), 0.45 Mbps(UP-STREAM)
 IP Profile for your line is - 3.5 Mbps

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Distinguished Sage
Message 4 of 4

Re: Hign noise margin slow speed

as your connection has been stable for 8 day
I suggest you contact the forum mods they should be able to reset your noise margin for you this is a link to them

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
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