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Author Topic: SNR margin higher at night than during the day  (Read 911 times)

konrado5

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SNR margin higher at night than during the day
« on: March 09, 2018, 10:24:15 PM »

What do you think that I have got at night higher SNR margin than during the day? I attach sudden increasement at night. I've read that SNR margin is usually lower at the night than during the day.
« Last Edit: March 09, 2018, 10:44:14 PM by konrado5 »
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burakkucat

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Re: SNR margin higher at night than during the day
« Reply #1 on: March 10, 2018, 12:00:04 AM »

It is an odd situation, I agree. The rise, however, is nowhere as great as the depression that some people observe on their circuits.

Here, in the UK, the SNRM will slowly sink during the hours of darkness as long distance RFI from Eastern Europe gradually becomes more noticeable.

Looking at the plot you have shown, I would be more inclined to check what is happening with the clock on the system that is running DSLstats. It seems, from the way the traces zig-zag, that the time appears to "run backwards" for brief moments. I've seen similar, once before, but I cannot recall what was the problem nor how it was fixed.
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konrado5

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Re: SNR margin higher at night than during the day
« Reply #2 on: March 10, 2018, 12:38:53 AM »

It is an odd situation, I agree. The rise, however, is nowhere as great as the depression that some people observe on their circuits.
I think somebody power off the router at night and it causes the rise because there is lower crosstalk.
Quote
Here, in the UK, the SNRM will slowly sink during the hours of darkness as long distance RFI from Eastern Europe gradually becomes more noticeable.
Perhaps my circuit is unusual, unusual Hlog and very low RFI susceptibility.
Quote
Looking at the plot you have shown, I would be more inclined to check what is happening with the clock on the system that is running DSLstats. It seems, from the way the traces zig-zag, that the time appears to "run backwards" for brief moments. I've seen similar, once before, but I cannot recall what was the problem nor how it was fixed.
I have every second measurement and dslstats on Netgear DGND3700v2 sometimes can't retrieve information.
« Last Edit: March 10, 2018, 02:49:15 AM by konrado5 »
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4candles

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Re: SNR margin higher at night than during the day
« Reply #3 on: March 10, 2018, 01:05:14 PM »

I think somebody power off the router at night...
That seems eminently feasible. Is the step change always precisely or very near 2300 every night?
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konrado5

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Re: SNR margin higher at night than during the day
« Reply #4 on: March 10, 2018, 03:02:51 PM »

That seems eminently feasible. Is the step change always precisely or very near 2300 every night?
It is about 23-1 every night.
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