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Author Topic: DLM  (Read 303 times)

daveesh1

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DLM
« on: July 11, 2017, 07:54:34 AM »

Had DLM intervene back in may and put interleaving on the line. Then last night a couple of power cuts didn't effect me as ups kicked in but at 3.10 this morning DLM has increased the applied interleaving but I can't see why ES errors are very low could it be DLM reacting to power cuts last night even though I was not effected any ideas
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kitz

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Re: DLM
« Reply #1 on: July 11, 2017, 09:59:53 AM »

Quote
this morning DLM has increased the applied interleaving

I cant see where any actual DLM changes have been made.   Your DLM profile is still INP=3.   Interleave delay = 8ms

If you mean Interleave depth, although the value has changed, it wont make any difference to your performance.   Using INP=3, the modem calculates the sufficient error protection required to be able to recover from noise burst of 3 DMT symbols.   DMT symbols (bits carried in the bin) can vary depending on your sync speed - the higher the sync speed then the more DMT symbols.

Your sync speed has increased from 39192 -> 43845.  Thus depth has increased 767 -> 859.    If you look on MDWS, there is a direct correlation between your increased sync speed and interleave depth.  :)

More info Interleaving and Impulse Noise Protection (INP)
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daveesh1

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Re: DLM
« Reply #2 on: July 11, 2017, 10:23:55 AM »

Thanks Kitz did notice the sync speed had increased slightly. Could this be the start of DLM looking to reduce interleaving depth
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kitz

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Re: DLM
« Reply #3 on: July 11, 2017, 10:48:07 AM »

I havent looked in detail, but I notice your current SNRm is 6.1dB... previously it was ~8dB which would likely account for the better speed now.   
Ive no idea why the SNR jumped to 8dB on 22nd of June..  sorry :/
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