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38 posts


#214768 27-May-2017 14:43
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Hey guys


I have really crap Internet. It's been crappy ever since we moved in. We live in Haitaitai and I understand we're quite a way from the exchange which would explain why I can't get VDSL.


However, about a month ago my sync speed jumped from 7.5Mb/s to 10.6Mb/s, which when you're at the lower end of the spectrum is quite a large jump. No changes at my end that I'm aware of. This lasted about 3 weeks and now it's back to 8Mb/s. 


In search of faster internets I've tried reterminating my OTP, reterminating the jack where I plug my modem into (it's cat6 from the OTP to the jack) but nothing makes any measureable difference. 


In case anyone wants to state the obvious, I am able to get UFB, but it's still a while away (for a few reasons).




> adsl status


  --------------------------- ATU-R Info (hw: annex A, f/w: annex A) -----------
   DSL Modulation          : ADSL2+(G.992.5)    
   State                   : SHOWTIME
   DS Actual Rate          :  8065317 bps   US Actual Rate       :  1205045 bps
   DS Attainable Rate      :  7848000 bps   US Attainable Rate   :  1269000 bps
   DS Path Mode            :        Fast    US Path Mode         :        Fast
   DS Interleave Depth     :        1       US Interleave Depth  :        1
   NE Current Attenuation  :       34 dB    Cur SNR Margin       :       11  dB
   DS actual PSD           :    18. 8 dB    US actual PSD        :     9. 9   dB
   ADSL Firmware Version   : 321311_A


  -------------------------------- ATU-C Info ---------------------------------
   Far Current Attenuation :        4 dB    Far SNR Margin       :        5  dB
   CO ITU Version[0]       : 00004244       CO ITU Version[1]    : 0000434d
   DSLAM CHIPSET VENDOR    : < BDCM >[/code]




Can anyone see anything which stands out in my modem diags above? Is 34dB 'NE current attenuation' a lot? Is there anything I can do (or ask Chorus to do) to change it?





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Uber Geek

  #1790254 27-May-2017 14:55
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As @Linux points out, that 34dB attenuation is the killer here - it means a long line, and in a residential area, that connection is about as good as it's going to get.


The increase a few weeks ago will be ddDLM which was introduced to Chorus ADSL lines about then. It will have dropped the noise margin from 12dB to about 6dB, and you saw in increase in sync rate. It's probably reverted due to stability to 12dB, meaning a drop in sync rate. It may change again, it may not.


Either way, sounds like you've sorted your internal wiring, sync rates look about right for the attenuation, so put the efforts into overcoming whatever the UFB issue is!

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