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Author Topic: Discussion of QLN and HLog graph scaling  (Read 5361 times)

roseway

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Re: Discussion of QLN and HLog graph scaling
« Reply #15 on: July 21, 2014, 06:55:22 AM »

Billion 7800DXL on TalkTalk ADSL2+:

Code: [Select]
adsl info --Hlog
adsl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    8000
Last initialization procedure status:   0
Max:    Upstream rate = 1024 Kbps, Downstream rate = 8408 Kbps
Bearer: 0, Upstream rate = 1020 Kbps, Downstream rate = 7393 Kbps

Tone number      Hlog
   0            -96.2500
   1            -96.2500
   2            -96.2500
   3            -96.2500
   4            -96.2500
   5            -96.2500
   6            -96.2500
   7            -21.0000
   8            -20.1875
   9            -20.0000
   10           -20.5625

Values for tones beyond the used range bottom out at -96.3125
« Last Edit: July 21, 2014, 07:13:32 AM by roseway »
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  Eric

Bald_Eagle1

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Re: Discussion of QLN and HLog graph scaling
« Reply #16 on: July 21, 2014, 06:01:24 PM »

Taking note of Kitz' comments, I propose the following:

QLN: -60 to -170 dBm/Hz
HLog: 0 to -120 dB (as before)

Taking recently obtained data from a G.DMT connection into account, perhaps we should consider these parameters for QLN & Hlog:-

QLN: -60 to -170 dBm/Hz (all modes)
HLog: 0 to -140 dB (ADSL connections) 0 to -100 (VDSL2 connections)

While we are at it, looking at the attached montage, maybe we should consider 70 to -20 for SNR (all modes).

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kitz

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Re: Discussion of QLN and HLog graph scaling
« Reply #17 on: July 22, 2014, 01:26:52 AM »

Seems fine by me :)
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roseway

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Re: Discussion of QLN and HLog graph scaling
« Reply #18 on: July 22, 2014, 07:23:21 AM »

Yes, I can agree to that. From the point of view of DSLstats, I can certainly change the scaling of the SNR per tone graph as a separate graph, but the combined bitloading/SNR per tone graph is a bit more problematical and I don't think I'll be changing it at this stage.
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Bald_Eagle1

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Re: Discussion of QLN and HLog graph scaling
« Reply #19 on: July 22, 2014, 09:14:51 AM »

but the combined bitloading/SNR per tone graph is a bit more problematical and I don't think I'll be changing it at this stage.


Ah, yes.

I had a very quick look at that graph last night & also decided to 'park' it for the time being  :)

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roseway

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Re: Discussion of QLN and HLog graph scaling
« Reply #20 on: July 22, 2014, 10:43:56 AM »

We seem to be reaching an agreement. Does anyone else have any comments?
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burakkucat

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Re: Discussion of QLN and HLog graph scaling
« Reply #21 on: July 22, 2014, 06:08:45 PM »

We seem to be reaching an agreement. Does anyone else have any comments?

I'm quite happy to leave things to those who know their own code.  :)

Once changes have been made, I'll be ready to test and examine the result(s).
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