Kitz ADSL Broadband Information
adsl spacer  
Support this site
Home Broadband ISPs Tech Routers Wiki Forum
 
     
   Compare ISP   Rate your ISP
   Glossary   Glossary
 
Please login or register.

Login with username, password and session length
Advanced search  

News:

Pages: 1 [2]

Author Topic: Discussion of QLN and HLog graph scaling  (Read 7881 times)

roseway

  • Administrator
  • Senior Kitizen
  • *
  • Posts: 43467
  • Penguins CAN fly
    • DSLstats
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 »
Logged
  Eric

Bald_Eagle1

  • Helpful
  • Kitizen
  • *
  • Posts: 2721
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).

Logged

kitz

  • Administrator
  • Senior Kitizen
  • *
  • Posts: 33879
  • Trinity: Most guys do.
    • http://www.kitz.co.uk
Re: Discussion of QLN and HLog graph scaling
« Reply #17 on: July 22, 2014, 01:26:52 AM »

Seems fine by me :)
Logged
Please do not PM me with queries for broadband help as I may not be able to respond.
-----
How to get your router line stats :: ADSL Exchange Checker

roseway

  • Administrator
  • Senior Kitizen
  • *
  • Posts: 43467
  • Penguins CAN fly
    • DSLstats
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.
Logged
  Eric

Bald_Eagle1

  • Helpful
  • Kitizen
  • *
  • Posts: 2721
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  :)

Logged

roseway

  • Administrator
  • Senior Kitizen
  • *
  • Posts: 43467
  • Penguins CAN fly
    • DSLstats
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?
Logged
  Eric

burakkucat

  • Respected
  • Senior Kitizen
  • *
  • Posts: 38300
  • Over the Rainbow Bridge
    • The ELRepo Project
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).
Logged
:cat:  100% Linux and, previously, Unix. Co-founder of the ELRepo Project.

Please consider making a donation to support the running of this site.
Pages: 1 [2]