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2820 network interfaces "pausing" sporadically

dbames
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01 Nov 2010 19:42 #13 by dbames

Replied by dbames on topic 2820 network interfaces "pausing" sporadically

I've just thrown it on mine now and notice that the modem code is different - from 211011_A to 232201_A.

Throughput seems to be down a fair bit too - from around 16mbit to 10mbit.

Old line stats (3.3.4_RC10):



Code:
  --------------------------- ATU-R Info (hw: annex A, f/w: annex A) -----------
   Running Mode            : ADSL2+(G.992.5)       State                : SHOWTIME
   DS Actual Rate          : 18530844 bps   US Actual Rate       :  1289166 bps
   DS Attainable Rate      : 18368000 bps   US Attainable Rate   :  1289000 bps
   DS Path Mode            :        Fast    US Path Mode         :        Fast
   DS Interleave Depth     :        0       US Interleave Depth  :        0
   NE Current Attenuation  :       22 dB    Cur SNR Margin       :        6  dB
   DS actual PSD           :    16. 7 dB    US actual PSD        :    12. 2   dB
   ADSL Firmware Version   : 211011_A
  -------------------------------- ATU-C Info ---------------------------------
   Far Current Attenuation :        5 dB    Far SNR Margin       :        6  dB
   CO ITU Version[0]       : 00004244       CO ITU Version[1]    : 0000434d
   DSLAM CHIPSET VENDOR    : < BDCM >

New line stats (3.3.5_RC2a):



Code:
  --------------------------- ATU-R Info (hw: annex A, f/w: annex A) -----------
   Running Mode            : ADSL2+(G.992.5)       State                : SHOWTIME
   DS Actual Rate          : 18778650 bps   US Actual Rate       :  1257162 bps
   DS Attainable Rate      : 18808000 bps   US Attainable Rate   :  1257000 bps
   DS Path Mode            :        Fast    US Path Mode         :        Fast
   DS Interleave Depth     :      224       US Interleave Depth  :        1
   NE Current Attenuation  :       16 dB    Cur SNR Margin       :        6  dB
   DS actual PSD           :    14. 0 dB    US actual PSD        :    12. 2   dB
   ADSL Firmware Version   : 232201_A
  -------------------------------- ATU-C Info ---------------------------------
   Far Current Attenuation :        4 dB    Far SNR Margin       :        6  dB
   CO ITU Version[0]       : 00004244       CO ITU Version[1]    : 0000434d
   DSLAM CHIPSET VENDOR    : < BDCM >

Edit: corrected old firmware code to 211011_A in initial paragraph

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cpnowell
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01 Nov 2010 22:49 #14 by cpnowell

Replied by cpnowell on topic 2820 network interfaces "pausing" sporadically

dbames wrote: I've just thrown it on mine now and notice that the modem code is different - from 211012_A to 232201_A.

Throughput seems to be down a fair bit too - from around 16mbit to 10mbit.

I'm curious, how come you had such old modem firmware on before? Mine's had 232201_A on it ever since release 3.3.3?

Like an idiot, I didn't take a stats snapshot before I upgraded to RC2A but I just backgraded to 3.3.4.1 official release and this is how it looks (same modem firmware of course)



Code:

New adsl stats (3.3.5_RC2a)
adsl status
--------------------------- ATU-R Info (hw: annex A, f/w: annex A) -----------
 Running Mode            :    G.DMT       State                : SHOWTIME
 DS Actual Rate          :  8128000 bps   US Actual Rate       :   448000 bps
 DS Attainable Rate      :  8640000 bps   US Attainable Rate   :  1316000 bps
 DS Path Mode            :  Interleave    US Path Mode         :  Interleave
 DS Interleave Depth     :       64       US Interleave Depth  :        4
 NE Current Attenuation  :       21 dB    Cur SNR Margin       :        7  dB
 DS actual PSD           :    19. 9 dB    US actual PSD        :    12. 4   dB
 ADSL Firmware Version   : 232201_A
-------------------------------- ATU-C Info ---------------------------------
 Far Current Attenuation :       10 dB    Far SNR Margin       :       27  dB
 CO ITU Version[0]       : 00005453       CO ITU Version[1]    : 00005443
 DSLAM CHIPSET VENDOR    : < TI >

Line stats with 3.3.4.1 on board
adsl status
--------------------------- ATU-R Info (hw: annex A, f/w: annex A) -----------
 Running Mode            :    G.DMT       State                : SHOWTIME
 DS Actual Rate          :  8128000 bps   US Actual Rate       :   448000 bps
 DS Attainable Rate      :  8640000 bps   US Attainable Rate   :  1308000 bps
 DS Path Mode            :  Interleave    US Path Mode         :  Interleave
 DS Interleave Depth     :        0       US Interleave Depth  :        0
 NE Current Attenuation  :       21 dB    Cur SNR Margin       :        7  dB
 DS actual PSD           :    19. 9 dB    US actual PSD        :    12. 1   dB
 ADSL Firmware Version   : 232201_A
-------------------------------- ATU-C Info ---------------------------------
 Far Current Attenuation :       10 dB    Far SNR Margin       :       27  dB
 CO ITU Version[0]       : 00005453       CO ITU Version[1]    : 00005443
 DSLAM CHIPSET VENDOR    : < TI >

Slight difference but not much... (rubbish transfer rates at this time of night...)

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dbames
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02 Nov 2010 09:22 #15 by dbames

Replied by dbames on topic 2820 network interfaces "pausing" sporadically

I think the different firmwares have been adapted for different line types (i.e. some may work better on longer lines than others). Though my line is short and good quality.

I notice that with our older firmware (and modem code), that DS Interleave Depth and US Interleave Depth were set at zero, but on 3.3.5_RC2b, they're all set to values of >0.

Not sure of the implication of this?

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cpnowell
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02 Nov 2010 13:18 #16 by cpnowell

Replied by cpnowell on topic 2820 network interfaces "pausing" sporadically

dbames wrote: I think the different firmwares have been adapted for different line types (i.e. some may work better on longer lines than others). Though my line is short and good quality.

Mine is between 600-700metres so sounds similar to yours. It's very frustrating not being on an LLU exchange and thereby being able to take full advantage of such a short line.

dbames wrote: I notice that with our older firmware (and modem code), that DS Interleave Depth and US Interleave Depth were set at zero, but on 3.3.5_RC2b, they're all set to values of >0.

Not sure of the implication of this?

There's a good explanation here... Interleaving

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dbames
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02 Nov 2010 16:37 #17 by dbames

Replied by dbames on topic 2820 network interfaces "pausing" sporadically

Sorry, maybe I should have said I know the general principals behind interleaving ... but generally expect it to be controlled by the DSLAM in the exchange. Indeed, my router is reporting 'fast' rather than 'interleave' - so shouldn't these values be zero?

But there again, it's been a long day and I'm probably missing something fundamental here!

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cpnowell
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02 Nov 2010 16:52 #18 by cpnowell

Replied by cpnowell on topic 2820 network interfaces "pausing" sporadically

dbames wrote: Sorry, maybe I should have said I know the general principals behind interleaving ... but generally expect it to be controlled by the DSLAM in the exchange. Indeed, my router is reporting 'fast' rather than 'interleave' - so shouldn't these values be zero?

But there again, it's been a long day and I'm probably missing something fundamental here!

That's a very good point you make and frankly, I don't have a sensible answer for that! (must admit I missed that in our table of figures...)

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