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# 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?

 

 

 

Cheers,
Mike


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  # 1790251 27-May-2017 14:48
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You can't ask Chorus to change anything as you are not a ChorusNZ customer and DLM was introduced to ADSL2+ so the change in SYN might be related to this

Linux

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  # 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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  # 1790297 27-May-2017 16:45
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RunningMan:

 

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!

 

 

 

 

Thanks for that, well that explains why my sync rate was better for a few weeks. Is there anything I can do to affect when DLM is enabled/disabled? Does it reset every few weeks, or does it look at [dis]connections over say a 2 weeks period in order to determine if it should be enabled?

 

Eagerly awaiting my fibre install (60 days away) but trying to do everything until then to improve things.


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  # 1790302 27-May-2017 17:05
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DLM is always enabled (now). @hio77 might be able to give you a few more details, but essentially it will always be monitoring your line, and will make changes as it thinks appropriate.


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  # 1790386 27-May-2017 19:25
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Further to just thank your lucky stars you are not connected to a Conklin Cabinet

Linux



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  # 1790390 27-May-2017 19:52
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Linux: Further to just thank your lucky stars you are not connected to a Conklin Cabinet

Linux

 

What does this mean? I don't know what a Conklin cabinet is.


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  # 1790394 27-May-2017 20:22
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mabnz:

Linux: Further to just thank your lucky stars you are not connected to a Conklin Cabinet

Linux


What does this mean? I don't know what a Conklin cabinet is.



You don't want to be connected to one for broadband it would give you nightmares but they are rural cabinets that only provide ADSL1 with very limited back haul like 8Mbps shared with all users

Linux

 
 
 
 


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  # 1790395 27-May-2017 20:24
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mabnz:

 

Linux: Further to just thank your lucky stars you are not connected to a Conklin Cabinet

Linux

 

What does this mean? I don't know what a Conklin cabinet is.

 

 

Telecom used a cheap way to roll out ADSL back then, and some unlucky people are still stuck on it. His point was that you'd be lucky to get 0.8Mbps on a Conklin, so don't complain about your 8Mbps.

 

DLM will optimize your line to the best that it's capable of, there's nothing you need to do. Just leave your modem turned on and let it work its magic.


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  # 1790962 29-May-2017 10:28
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RunningMan:

 

DLM is always enabled (now). @hio77 might be able to give you a few more details, but essentially it will always be monitoring your line, and will make changes as it thinks appropriate.

 

 

Exactly what is at play here, If you PM me your account number and line number, i can dig into your stats and hopefully shed some light.

 

Could be a simple fact of that your line has a little too many errors on it, so ddDLM pulled back to 12dB again.

 

 

 

My personal adsl connection moves from 12mbit on 12dB to 15mbit on 9dB and 18mbit at 6dB.

 

Due to a line fault, i got thrown back to 12dB/12dB. This is slowly dropping back down, currently 12dB/9dB.

 

 

 

My vdsl line that runs along side also saw much the same gains.

 

 

 

 

 

If i can pickup that your line is holding back due to errors or such, there is things that can be done, a master splitter for instance will clean up internal wiring affecting things.





#include <std_disclaimer>

 

Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.


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