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Author Topic: How much does your SNRM's drop  (Read 32578 times)

NewtronStar

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How much does your SNRM's drop
« on: November 12, 2013, 10:11:07 PM »

Hi we all know the SNRM drops during the evening and attainable sync rate seems to follow.
Just would like to get and idea on how much it swings from 11am and 6pm don't need any graphs just your DS & US SNRM dB at the times in my post.

thanks
« Last Edit: November 12, 2013, 10:20:54 PM by NewtronStar »
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renluop

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Re: How much does your SNRM's drop
« Reply #1 on: November 12, 2013, 10:29:37 PM »

 Today
a.m d/s 3.4 u/s 10.8
p.m d/s 5.8 u/s   9.5

8th
a.m d/s 3.3 u/s 10.1
p.m d/s 2.7 u/s 10.1

but remember that margins change all the time.
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Bald_Eagle1

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Re: How much does your SNRM's drop
« Reply #2 on: November 12, 2013, 10:30:36 PM »

Code: [Select]

11:00
Down Up
SNR (dB): 5.8 6.0




18:00
Down Up
SNR (dB): 4.9 6.0




22:00
Down Up
SNR (dB): 5.5 6.0



I know you said no graphs, but I just wanted to show you the 24/7 DS fluctuations I now see since I started using Wolfy's new GUI firmware.

So, the 18:00 results could have been when it had fluctuated downward.


EDIT:

Having just checked modem_stats.log, it can indeed be seen that DS SNRM was lower at 18:00:-

12/11/2013 17:57 20514 4940 5.6 6.0
12/11/2013 17:58 20514 4940 5.5 6.0
12/11/2013 17:59 20514 4940 4.9 5.9
12/11/2013 18:00 20514 4940 4.9 5.9
12/11/2013 18:01 20514 4940 5.8 6.0
12/11/2013 18:02 20514 4940 5.5 6.0
« Last Edit: November 12, 2013, 10:41:18 PM by Bald_Eagle1 »
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NewtronStar

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Re: How much does your SNRM's drop
« Reply #3 on: November 12, 2013, 10:35:40 PM »

11am
                down          up
SNR (db)   6.2             5.8


6PM          4.8             5.9
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roseway

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Re: How much does your SNRM's drop
« Reply #4 on: November 12, 2013, 10:37:17 PM »

See below:
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NewtronStar

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Re: How much does your SNRM's drop
« Reply #5 on: November 12, 2013, 10:45:00 PM »

Today
a.m d/s 3.4 u/s 10.8
p.m d/s 5.8 u/s   9.5

8th
a.m d/s 3.3 u/s 10.1
p.m d/s 2.7 u/s 10.1

but remember that margins change all the time.

ok thats not what i expected the SNRM should go down during the evenings  ???
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NewtronStar

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Re: How much does your SNRM's drop
« Reply #6 on: November 12, 2013, 11:00:30 PM »



EDIT:

Having just checked modem_stats.log, it can indeed be seen that DS SNRM was lower at 18:00:-

12/11/2013 17:57 20514 4940 5.6 6.0
12/11/2013 17:58 20514 4940 5.5 6.0
12/11/2013 17:59 20514 4940 4.9 5.9
12/11/2013 18:00 20514 4940 4.9 5.9
12/11/2013 18:01 20514 4940 5.8 6.0
12/11/2013 18:02 20514 4940 5.5 6.0

 ;D thought so, just trying to get some sort of consensus of how low it go's especially at this time of year with only 8 hours of sunlight, because it does look more like atmospheric/Ionospheric is causing more interference on BroadBand CP cables than in the Summer time.
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burakkucat

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Re: How much does your SNRM's drop
« Reply #7 on: November 12, 2013, 11:25:45 PM »

I see a consistent 2 dB swing in the DS SNRM (hours of daylight v hours of darkness) throughout the entire year.

Following the Eagle's lead, I attach two graphs from 2012. The first, from August 2012, shows the typical 2 dB swing of the DS SNRM over a 24 hour period. The second, from December 2012, shows how that the US SNRM was really hit by somebody's flashing lights!  >:(
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NewtronStar

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Re: How much does your SNRM's drop
« Reply #8 on: November 12, 2013, 11:36:49 PM »

I see a consistent 2 dB swing in the DS SNRM (hours of daylight v hours of darkness) throughout the entire year.

Following the Eagle's lead, I attach two graphs from 2012. The first, from August 2012, shows the typical 2 dB swing of the DS SNRM over a 24 hour period. The second, from December 2012, shows how that the US SNRM was really hit by somebody's flashing lights!  >:(

right so your DS and US snrm drop is consistant all year round except for December with XMAS tree lights the US SNRM hates christmas :ouch: thats good info.
« Last Edit: November 12, 2013, 11:47:57 PM by NewtronStar »
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burakkucat

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Re: How much does your SNRM's drop
« Reply #9 on: November 13, 2013, 12:08:19 AM »

Here is a 24 hour graph, from last June, showing the typical variation in SNRM that is observed on my circuit.
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NewtronStar

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Re: How much does your SNRM's drop
« Reply #10 on: November 13, 2013, 06:10:10 PM »

Here is a 24 hour graph, from last June, showing the typical variation in SNRM that is observed on my circuit.

Cheers for the graph ;D its seems like the DS SNRM has a gradual rise as the sun rise's early in the morning and sets later (mid summer) again a gradual decrease after 8pm.

And I don't know whats up with your US SNRM its very messy way to many random drops in 24 hours.
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kitz

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Re: How much does your SNRM's drop
« Reply #11 on: November 13, 2013, 08:40:16 PM »

Mines normally pretty boring..  continual flatline 24/7, very occasional 0.5 dB blip on the graph.

What have have seen is a very slow decline in my SNRm. So slow you wouldnt really notice it on a day to day basis.  When I first got fttc it was at about 18dB, a new pair took it to about 14dB.  It now sits at 8.3dB.  The largest down jump was after a forced resync this morning and I lost 3dB immediately, yet there was no reason to show for this :(
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NewtronStar

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Re: How much does your SNRM's drop
« Reply #12 on: November 13, 2013, 10:30:54 PM »

Mines normally pretty boring..  continual flatline 24/7, very occasional 0.5 dB blip on the graph.

What have have seen is a very slow decline in my SNRm. So slow you wouldnt really notice it on a day to day basis.  When I first got fttc it was at about 18dB, a new pair took it to about 14dB.  It now sits at 8.3dB.  The largest down jump was after a forced resync this morning and I lost 3dB immediately, yet there was no reason to show for this :(

its an odd issue this SNRM drop during evenings, I have read your low SNR problems -> http://www.kitz.co.uk/adsl/lowSNR.htm many times.

but something does not seem to add up, yes street lights and heating pump and so on but still there is something missing in the overall SNRM drops equation,.

how could more users online at the same exchange effect your SNRM ?
it's as you say difficult to say what is the cause but a shorter copper wire with grounded coaxial sheilding to CP premises will help reduce these effects.
« Last Edit: November 13, 2013, 10:33:09 PM by NewtronStar »
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burakkucat

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Re: How much does your SNRM's drop
« Reply #13 on: November 13, 2013, 11:22:30 PM »

. . . a shorter copper wire with grounded coaxial sheilding to CP premises will help reduce these effects.

Please remember that the xDSL circuit is (as close as possible to being) a balanced pair, operating in differential mode. So if you are proposing screening, you will need to use STP (screened twisted pair) cable. Why is differential mode used? Because any spurious, alien, signal induced is very likely to be induced onto both wires of the pair. Common mode rejection of the alien signal occurs whilst the required signal still "gets through".
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NewtronStar

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Re: How much does your SNRM's drop
« Reply #14 on: November 14, 2013, 12:05:22 AM »

signal induced is very likely to be induced onto both wires of the pair. Common mode rejection of the alien signal occurs whilst the required signal still "gets through".

I love the way you word it  :lol: I know it's a bad word on the forums so i'll type it very small
"crosstalk  :no:
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