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Author Topic: Seeing some SNR oddities since G.inp activated  (Read 3281 times)

tommy45

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Seeing some SNR oddities since G.inp activated
« on: April 18, 2015, 02:01:20 PM »

I have noticed some odd increases and decreases in SNR  and Attainable rates since G.inp ed  Snr will go as high as 7.6db and as low as 6.6db and there is a pattern emerging the times of day it changes  are most frequently around 12am or 12pm,  when there's a bigger increase/decrease  there's a spike of FEC's and a small amount of Error secs and crc's  at those times, a have also noticed that bit swapping appears to pause at those times too,  there isn't any obvious reason why it would do this ,type of  cycling ,

I in doing some comparisons  between when my connection was  Fast path  and now it's g.inp'ed  the bit's per tone are lower now than they used to be is this due to g.inp?
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burakkucat

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Re: Seeing some SNR oddities since G.inp activated
« Reply #1 on: April 18, 2015, 02:58:08 PM »

Very difficult to say.  :-\  As G.INP is still new to all of us, the best thing you can do is to keep monitoring the circuit's statistics and review the data regularly. Hopefully a pattern will eventually emerge which will then add further knowledge to the subject.
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tommy45

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Re: Seeing some SNR oddities since G.inp activated
« Reply #2 on: April 18, 2015, 03:17:31 PM »

Well it's been around a month today  that I've been g.inped, there seems to be a 10day or so cycle  where the SNR will be around it's current value for the next 10 days or so,  then it will increase in steps  then 10 days at the higher SNR level  before going to what it is now,  I wonder if it's DLM related , some sort of sequence to determine  if it should make changes to the INP levels perhaps, ?
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kitz

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Re: Seeing some SNR oddities since G.inp activated
« Reply #3 on: April 18, 2015, 05:26:08 PM »

hmmm  just had a look, so there is.   I cant see any reason why it would change as your error rates look fine. 
G.INP = 47 has stayed he same throughout the period as has Interleaving and delay.  So unless there is something in the figures that isnt recorded by MDWS I dont know.   
As regards the latest period its possible that one of your disturbers has been away on holiday for the week and turned the modem/router off. :shrug2:
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BigJ

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Re: Seeing some SNR oddities since G.inp activated
« Reply #4 on: May 01, 2015, 01:12:07 PM »

Hi toomy45

I've seen the same thing happen twice, today and yesterday around midday lasting for roughly 1-2hrs.

Noise margin
Down 6.3 -> 8.1 db
Up 12.2 -> 12.7 db

Attainable
Down 66925 -> 73048 Mbps
Up 29662 -> 30351 Mbps
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tommy45

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Re: Seeing some SNR oddities since G.inp activated
« Reply #5 on: May 02, 2015, 02:33:47 AM »

The other odd thing is that my snr values used to always be above 7.0 ds and 15.2 us when on fast path, and the attainable was around 82-83mbps, i currently see similar attainable but lower snr figures , the only other change is the us power, it is now slightly higher, I thought g.inp gave an increase in spare snr levels ?
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BigJ

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Re: Seeing some SNR oddities since G.inp activated
« Reply #6 on: May 03, 2015, 02:57:01 PM »

Tom

Have you noticed the time period over which the changes occur increasing? For me

1st ~50mins
2nd ~1.3hrs
3rd ~7.6hrs

Edit: In anyone is interested, stats available on MDWS for BigJ
« Last Edit: May 03, 2015, 02:59:50 PM by BigJ »
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kitz

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Re: Seeing some SNR oddities since G.inp activated
« Reply #7 on: May 05, 2015, 12:18:01 PM »

BigJ - Yours appears quite typical of a disturber line switching their modem off. 
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