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DavidCo
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Message 1 of 21

Ambient temp affects noise margin

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I normally get 50Mb at 3.0 dB but when there is a 'heatwave' I end up with 45Mb at 3.0dB
So what is there outside, I guess, that gets hot, expands and increases noise?
I am 'off a pole' btw.

No disconnect, the DLM 'sees' the noise margin dropping and starts dropping the speed.

After the temp goes back to normal the speed increases.

David

 

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Distinguished Sage
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Message 2 of 21

Re: Ambient temp affects noise margin

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Your connection speed cannot drop unless the router drops internet connection but the max attainable will fluctuate as your noise margin changes. My noise margin moves +/- 0.2db depending on weather conditions with corresponding decreases/increases in max attainable. My connection speed remains constant though



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DavidCo
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Message 3 of 21

Re: Ambient temp affects noise margin

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+/- 0.2db, if only!SNR 23_4.JPG

 

 

As you can see the max is lower than the actual.

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Distinguished Sage
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Message 4 of 21

Re: Ambient temp affects noise margin

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you have G.INP active on your line hence the lower noise margin - normal about 3db



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DavidCo
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Message 5 of 21

Re: Ambient temp affects noise margin

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I understand about G.INP etc

Please compare photosCapture 23.7.JPG

 

 

 

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Message 6 of 21

Re: Ambient temp affects noise margin

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sorry  I seem to be missing something

are you saying that your data rate not Max data rate is changing as your noise margin changes but you dsl uptime is not resetting?



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DavidCo
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Message 7 of 21

Re: Ambient temp affects noise margin

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I see what you are getting at now.

1. The max data rate does not change.

2. The noise margin does change.

3. The actual data rate does change.

4. The dsl uptime does reset as can be seen by the last photo.

It has always seemed weird that the max data can be lower than the actual. This has been 'proved' by speed tests.

 

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DavidCo
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Message 8 of 21

Re: Ambient temp affects noise margin

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There is one thing I hesitated to ask - perhaps the HH6 is faulty

The stats are strange after all and whilst I do not know how it 'all' works perhaps the hub does not like the heat?

The other issue is the cabinet. The data below have been like this since 2013 and do not reflect reality.Cab.JPG

 The actual have been much higher for some years. A boost eng' commented that the cab' would have to be sorted out one day.

 

 

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Message 9 of 21

Re: Ambient temp affects noise margin

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@DavidCo wrote:It has always seemed weird that the max data can be lower than the actual. This has been 'proved' by speed tests.

 


Not really, its quite normal, it depends what you noise margin was at sync time.

Mine is at the moment

Data rate:8.539 Mbps / 65.094 Mbps
Maximum data rate:8.539 Mbps / 64.813 Mbps
 
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DavidCo
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Message 10 of 21

Re: Ambient temp affects noise margin

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Beats me then because I know that when the ambient temp' drops back to 'normal' my speed will gradually increase back to what it was!

 

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