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christarry85
Aspiring Contributor
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Message 1 of 23

Speed Drop & Increase in Noise Margin / SNR

Over the last four weeks, my Infinty 1 has dropped at least once a day and over this period of time lost over 10mbps speed.

 

This seems to conincidentally coincide with a large amount of Openreach activity in our village.

 

The SNR and noise margin seem to have increased over this time, but I haven't been tracking them in a huge amount of detail.

 

I have tried today connecting directly to the test socket with a new microfilter and the stats remain exactly the same which I believe rules out internal issues.

 

Stats posted below:

 BB.PNG

 

The BT wholesale check says "results inconclusive", but I can't work out how to do the third and final check as the Smart hub won't let me change the username as the site requests.

 

Any suggestions as to how to progress with this?

 

Thanks

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imjolly
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Message 2 of 23

Re: Speed Drop & Increase in Noise Margin / SNR

it looks like all the drops in connection have resulted in DLM putting your connection in a banded profile to try and get a stable connection  https://community.plus.net/t5/Library/FTTC-DLM-What-it-is-How-it-works/ba-p/1322799

 

try quiet line test  dial 17070 option 2  should be quiet and best with corded phone



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Keith_Beddoe
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Message 3 of 23

Re: Speed Drop & Increase in Noise Margin / SNR

Ignore the final check, as its not applicable.

 

Could you please post the results from the BT Wholesale speed checker, including the further diagnostics.
 
http://www.speedtest.btwholesale.com/

 

The speed drop should correct itself eventually, one the disconnects stop.

 

Is there any noise on your phone calls? Dial 17070 and select option 2, there should be no noise between the announcements.

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christarry85
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Message 4 of 23

Re: Speed Drop & Increase in Noise Margin / SNR

There is definately a background hum on this - not done it before though so not sure if it is more / less than before.

 

Found a screenshot from perhaps year ago and the noise margin was 4.6 in that, so something must have changed.

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Keith_Beddoe
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Message 5 of 23

Re: Speed Drop & Increase in Noise Margin / SNR


@christarry85 wrote:

There is definately a background hum on this - not done it before though so not sure if it is more / less than before.

 

Found a screenshot from perhaps year ago and the noise margin was 4.6 in that, so something must have changed.


Hum normally indicates a partial earthed connection, or an unbalanced line.

 

Provided you only have a single phone socket in the house (no exdtensions), and there are no other junction boxes before that master socket, that may have got damp, then its probably an external fault, water has got in somewhere.

 

Have you run a line test?

 

 

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imjolly
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Message 6 of 23

Re: Speed Drop & Increase in Noise Margin / SNR

was quiet line test done with corded phone?  a dull hum is normal when using a cordless phone



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Keith_Beddoe
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Message 7 of 23

Re: Speed Drop & Increase in Noise Margin / SNR

All modern cordless phones use a switched mode power supply, not a mains transformer, so there is no hum introduced.

 

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imjolly
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Message 8 of 23

Re: Speed Drop & Increase in Noise Margin / SNR

@Keith_Beddoe

 

good to know Keith but it depends what you call modern and there is no way of telling what type of phone corded/cordles that any poster actually has



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christarry85
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Message 9 of 23

Re: Speed Drop & Increase in Noise Margin / SNR

It was a bog standard corded phone.

 

The wholesale speedtest won't seem to let me do the second stage diagnostics, it skips straight to the third stage which requires the changed login - perhaps because I have already run it today?

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imjolly
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Message 10 of 23

Re: Speed Drop & Increase in Noise Margin / SNR

you should be able to run btspeedtester as often as you want  try a different browser

 

don't run the 3rd test



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