Changes to DLM Incoming

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'That VDSL Cat'
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#1923075 21-Dec-2017 11:37

Your certainly getting errors there, ddDLM is doing it's thing to stabilize the connection.

I'm not aware of any Slingshot folk around here, May be best to log with RSP.

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Jase2985

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#1923076 21-Dec-2017 11:38

the change in the SNR explains the speed difference.

whats caused that? no idea and unlikely someone from your ISP will be able to find out either. could be anything

AidanP

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#1923080 21-Dec-2017 11:41

but the weird thing is that previously the downstream had been on 6db SNR and had been stable for some time, but until recently im getting an overhaul of errors

hio77

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#1923083 21-Dec-2017 11:46

AidanP:

but the weird thing is that previously the downstream had been on 6db SNR and had been stable for some time, but until recently im getting an overhaul of errors

Which would indicate a line fault, increase in crosstalk, IW fault, degraded contact etc..

Copper is not static, it is always changing. It's my roles biggest bane because of that!

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AidanP

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#1927124 30-Dec-2017 19:57

This morning I woke up and checked my modem stats and to my astonishment just after 3 hours of uptime I had 20000 crc errors. I don't know what the ddDLM was thinking trying to bring me back to 6.0db snr, when I was stable at 9db but now 15 hours uptime and 110000 crc errors. I don't know how my connection hasn't dropped.

hio77

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#1927133 30-Dec-2017 20:30

It's trying to push your connection faster as it suspected there was leway.

Likely what you will see next is the INP/Latency/PSD will adjust to fit 6dB

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AidanP

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#1927894 2-Jan-2018 08:11

Update:

freakngeek

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#1927991 2-Jan-2018 10:34

Your SNR has dropped even further but Interleave depth has shot up heaps to compensate for CRC errors
I think ddDLM is having hard time with your connection.

AidanP

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#1928154 2-Jan-2018 19:14

Crc errors have climbed to 600000 with dsl uptime being 14 hours

hio77

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#1928241 2-Jan-2018 21:57

ddDLM can never stabalize a bad line, a marginal line it will struggle to work with.

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AidanP

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#1928664 3-Jan-2018 21:14

I have done some calculations and I am getting 490 crc errors a minute. Dsl uptime 1 day 16 hours 48 minutes with 1.2 million crc errors. When I get home I will swap out modems and will let the NF4V run for some time to see if it makes any difference.

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hio77

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#1928706 3-Jan-2018 21:54

are you possibly running a -2dB snr profile on that modem?

Could account for the heavy increase in errors + the low snr.

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AidanP

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#1928707 3-Jan-2018 21:57

No everything related to dsl tweaking on the modem has been switched off.

AidanP

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#1928711 3-Jan-2018 21:59

But my SNR ratio does fluctuate between 6db and 4.4dB

freakngeek

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#1928821 4-Jan-2018 08:05

My SNR drops to 5db from a 6db profile certain times of the day.
I think caused by my actual rate going higher than attainable
This usually means a few FECs (not CRCs) for my connection

Uptime 750hours

Can your modem set the SNR profile higher ?
You may need to try adding 2db to SNR
This will lower your max attainable rate but hopefully bring your actual closer to max (once ddDLM lowers your Interleave depth with fewer CRCs)

Really weird why ddDLM hasn't upped your SNR profiile after a gazillion CRC's hope it doesn't keep on raising the Interleave depth to compensate as currently not really working
Seems determined to keep you on 6db no matter what the cost.

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