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Author Topic: Quick Query over Bitloading graph  (Read 2059 times)

weegi75

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Quick Query over Bitloading graph
« on: March 07, 2015, 11:57:16 AM »

Morning all,

I've had some issues since I moved to BT Infinity so have decided to gather information so I can tackle BT with the right information from the start. My IP Profile is now sitting at 19998, where as before it was up around the 30,000 mark and I now have an INP value of 11.5 on my downstream.

I've unlocked a HG612 and am using DSLStats to start logging data, one question I had, does this graph look normal to you all?



Just wondered if this amount of "other" was normal or not?

Thanks
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roseway

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Re: Quick Query over Bitloading graph
« Reply #1 on: March 07, 2015, 01:20:40 PM »

Welcome to the forum. :)

Could you copy the pbParams text here please. You can see this at Telnet Data --> pbParams. If that tab isn't present, go to 'Items to Monitor' and tick 'Stats per band' in the pbParams section.

This will enable us to check that DSLstats has analysed the band plan correctly.
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  Eric

weegi75

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Re: Quick Query over Bitloading graph
« Reply #2 on: March 07, 2015, 03:20:45 PM »

Thanks for the welcome, data is below:

xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason:   2
Max:   Upstream rate = 6300 Kbps, Downstream rate = 31636 Kbps
Path:   0, Upstream rate = 6319 Kbps, Downstream rate = 19998 Kbps

Discovery Phase (Initial) Band Plan
US: (0,95) (880,1195) (1984,2771)
DS: (32,859) (1216,1959) (2792,4083)
Medley Phase (Final) Band Plan
US: (0,95) (880,1195)
DS: (32,859) (1216,1959)
       VDSL Port Details       Upstream        Downstream
Attainable Net Data Rate:       6300 kbps         31636 kbps
Actual Aggregate Tx Power:        7.4 dBm          11.0 dBm
============================================================================
  VDSL Band Status   U0   U1   U2   U3   D1   D2   D3
  Line Attenuation(dB):   6.2   50.3   66.0   N/A   22.4   61.3   0.1
Signal Attenuation(dB):   6.2   50.1   N/A   N/A   22.4   61.3   N/A
        SNR Margin(dB):   5.9   6.0   N/A   N/A   7.7   7.8   N/A
         TX Power(dBm):   1.9   6.0   N/A   N/A   9.6   5.6   N/A
#
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roseway

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Re: Quick Query over Bitloading graph
« Reply #3 on: March 07, 2015, 03:34:39 PM »

If you look at the medley phase band plan you can see that the first US band overlaps the first DS band, and it's this shared group of tones 32-95 which are shown in blue.

It's not uncommon to see overlapping bands in this area, but as I understand it, the latest firmware for the HG612 sets up a band plan which doesn't have overlaps. You can get the latest unlocked firmware here: https://mega.co.nz/#F!LdJFDIJL!e_E1twsIg2kTet8mPjrb4w
The latest is the B030SP08 which contains three different versions, the first of which is the original (locked) version. Either of the others will do, but choose the third if you want access to the GUI interface.
« Last Edit: March 07, 2015, 03:57:34 PM by roseway »
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  Eric

weegi75

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Re: Quick Query over Bitloading graph
« Reply #4 on: March 07, 2015, 03:42:53 PM »

Thanks for the link, I'll flash that and see how I get on.
Seeing DSL connects during the night so the fun will be in tracking the fault down.

Thanks again
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NewtronStar

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Re: Quick Query over Bitloading graph
« Reply #5 on: March 07, 2015, 06:53:44 PM »

Your Interleave depth has fallen since your last resync which is encouraging is says to me you have had a previous load of noise on your line and the DLM has hit you very hard.

And the DS SNRM has gone from 7.7dB to 10dB thats much better.

Yet at least it's showing the your line is trying to recover this could take a few weeks though for it go back to the way it was.
« Last Edit: March 07, 2015, 06:56:58 PM by NewtronStar »
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WWWombat

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Re: Quick Query over Bitloading graph
« Reply #6 on: March 09, 2015, 01:32:00 AM »

(I'm looking at the data on MyDSLWebStats)

DLM has intervened quite severely on the line, with high INP and delay values. The downstream speed has been banded, and is now restricted to 20Mbps. The attainable speed of 32 Mbps is likely to be an over-estimate, but you should still be able to do better,

I can't tell *what* is wrong. Hlog and QLN graphs don't show a fault; the tone graph shows a few dips, quite possibly caused by radio interference (tones 188, 211, 252 and 282). At first, from the graph in the OP, I thought they might be caused by a bridged tap, but nothing shows on the Hlog graph.

There doesn't appear to be many ES's showing at the moment, so no indication of ongoing bursts of noise that are not being handled by the FEC settings.
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