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Author Topic: ADSL2 vs ADSL2+ on a very long ( 67 dB attn ) BT 21CN line  (Read 5293 times)

Weaver

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  • Retd s/w dev; A&A; 4x7km ADSL2 lines; Firebrick
Re: ADSL2 vs ADSL2+ on a very long ( 67 dB attn ) BT 21CN line
« Reply #15 on: December 25, 2015, 11:55:41 PM »

I notice from ejs's bits-per-bin graph that there's no chance for me of getting near using my higher octave, as ejs doesn't even get to tone 255 in adsl2+ mode with his lower d/s attn.
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Weaver

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  • Posts: 11459
  • Retd s/w dev; A&A; 4x7km ADSL2 lines; Firebrick
Re: ADSL2 vs ADSL2+ on a very long ( 67 dB attn ) BT 21CN line
« Reply #16 on: December 26, 2015, 10:11:52 AM »

Next day (ADSL2 mode)

2015-12-26 ::

Line 1 :
BRAS=2161Kb/s FTR=2272Kb/s MSR=2272Kb/s ServOpt=1 I/L=I
Up Sync=640Kb/s LoopLoss=41.6dB SNR=6dB ErrSec=0 HECErr=0 Cells=0
Down Sync=2784Kb/s LoopLoss=64.5dB SNR=6dB ErrSec=0 HECErr=N/A Cells=0

Line 2 :
BRAS=2280Kb/s FTR=2272Kb/s MSR=2272Kb/s ServOpt=1 I/L=I
Up Sync=419Kb/s LoopLoss=43dB SNR=4.3dB ErrSec=5 HECErr=0 Cells=0
Down Sync=2738Kb/s LoopLoss=65.2dB SNR=6dB ErrSec=46 HECErr=N/A Cells=0

Line 3 :
BRAS=2455Kb/s FTR=2272Kb/s MSR=2272Kb/s ServOpt=1 I/L=I
Up Sync=496Kb/s LoopLoss=41.9dB SNR=5.8dB ErrSec=0 HECErr=0 Cells=0
Down Sync=2902Kb/s LoopLoss=65.1dB SNR=6dB ErrSec=0 HECErr=N/A Cells=0
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Weaver

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  • Posts: 11459
  • Retd s/w dev; A&A; 4x7km ADSL2 lines; Firebrick
Re: ADSL2 vs ADSL2+ on a very long ( 67 dB attn ) BT 21CN line
« Reply #17 on: January 02, 2016, 07:11:51 PM »

And when the lines came out of the training phase, everything changed. Bizarrely.

Speeds that had been seen around ~2700k sync rate d/s at 6dB SNRM came down to something like 2200k at the same speed or at 9dB SNRM.

I have absolutely no idea what's going on. I would have thought that the training phase would automatically ensure that you come out with the right speed to match a 6dB chosen target SNRM?

Anyway, I lost a huge amount of speed at the end of the training phase.
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