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[Bald_Eagle1]

With SNR at around the target 6dB, it does appear that is the max your connection can currently achieve.

Have you managed to get any graphs running that might give a 'picture' of how your connection is/has been performing?


What level(s) of interleaving, INP & delay have now been set by DLM & how long has that taken from original installation?


I do notice that Retrain Reason in your stats has been 0 a few times.
That suggests you have been rebooting/disconnecting the power to your modem.
Do you do that quite often?
(DLM isn't really a big fan of that sort of thing & quite often reacts rather aggressively by applying high levels of interleaving & thus lower speed levels).

[ryant704]

Sorry to steal on the topic but when the Retrain reason is 0 it means you disconnect the modem a lot?

What does 1 mean?

I'm assuming 2 mean it's in training?

[burakkucat]

  Good questions and worthy of a thread of their own.

Perhaps Eric or Kitz could please perform a cut / paste?

Once done, then the Eagle can expound on the topic (from his extensive notes).

[roseway]

I'll open a separate thread on the subject.

See http://forum.kitz.co.uk/index.php/topic,12504.msg236038.html#msg236038

[colly05]

I have rebooted a few times just positioning where the modem is and 1 time when the speed dropped ill leave it again for week ? Or so and report back ?
Thanks for any help tho ;-)

[colly05]

stats from just now been stable for nearly 4 days

whats your thoughts ??

[colly05]

well its still the same speed.
so do you guys think that's the final speed or is there a way to reset the interleave and leave it be again ?

any info would be great thanks

[burakkucat]

Let me see if I can 'whistle up' an Eagle to review your last few posts . . . 

[asbokid]

The Relative Capacity Occupation (RCO) - that is sync rate over max attainable rate - is quite low at 86%   [1]

That might suggest the effect of banding.

However, the nearest profile with a max downstream rate exceeding 47,607Kbps (your sync rate) but less than 54,792Kbps (your attainable rate) is a profile with a max downstream rate of 54,000Kbps.

So it doesn't appear that your sync rate of 47,607Kbps is chasing that max rate of 54,000Kbps. Your line appears to have found its  natural, organic transmission rate.

You also have moderate error counts, which the DLM algorithm has sought to overcome through interleaving and INP.

Based on those observations and the other parameters including your downstream minimum INP level (3 symbols) and your Max Interleaving Delay (8ms), we can probably identify the profile (or at least define a suitable one):

Code: [Select]

MA5616(config)#display vdsl channel-profile 997
  ------------------------------------------------------------------------------
  Profile index: 997      Name: colly05_channel_profile
  Data path mode                                  : PTM
  Minimum impulse noise protection downstream     : ThreeSymbols
  Minimum impulse noise protection upstream       : NoProtection
  Maximum interleaving delay downstream(ms)       : 8
  Maximum interleaving delay upstream(ms)         : 0
  Minimum transmit rate downstream(Kbps)          : 27000
  Minimum reserved transmit rate downstream(Kbps) : 27000
  Maximum transmit rate downstream(Kbps)          : 54000
  Minimum transmit rate upstream(Kbps)            : 10000
  Minimum reserved transmit rate upstream(Kbps)   : 10000
  Maximum transmit rate upstream(Kbps)            : 20000
  Rate threshold downshift downstream(Kbps)       : 0
  Rate threshold upshift downstream(Kbps)         : 0
  Rate threshold downshift upstream(Kbps)         : 0
  Rate threshold upshift upstream(Kbps)           : 0
  PHY-R control in downstream                     : Disable
  PHY-R control in upstream                       : Disable
  Erasure decoding switch                         : Disable
  Minimum SOS bit rate downstream(8Kbps)          : 8
  Minimum SOS bit rate upstream(8Kbps)            : 8
  Minimum expected throughput downstream(Kbps)    : 32
  Maximum expected throughput downstream(Kbps)    : 200000
  Maximum net data rate downstream(Kbps)          : 200000
  Minimum delay downstream(ms)                    : 0
  Maximum delay downstream(ms)                    : 63
  Minimum impulse noise protection against single     
  high impulse noise event downstream(DMT symbol) : 0
  Minimum impulse noise protection against single     
  high impulse noise event transported over DMT       
  symbols with a subcarrier spacing of 8.625kHz       
  downstream(DMT symbol)                          : 0
  Single high impulse noise event ratio               
  downstream(0.001)                               : 0
  Minimum impulse noise protection against           
  repetitive electrical impulse noise                 
  downstream(DMT symbol)                          : 0
  Minimum impulse noise protection against           
  repetitive electrical impulse noise transported     
  over DMT symbols with a subcarrier spacing of       
  8.625kHz downstream(DMT symbol)                 : 0
  Repetitive electrical impulse noise                 
  inter-arrival time downstream                       
  0-100Hz 1-120Hz(0~1)                            : 0
  Minimum expected throughput upstream(Kbps)      : 32
  Maximum expected throughput upstream(Kbps)      : 200000
  Maximum net data rate upstream(Kbps)            : 200000
  Minimum delay upstream(ms)                      : 0
  Maximum delay upstream(ms)                      : 63
  Minimum impulse noise protection against single     
  high impulse noise event upstream(DMT symbol)   : 0
  Minimum impulse noise protection against single     
  high impulse noise event transported over DMT       
  symbols with a subcarrier spacing of 8.625kHz       
  upstream(DMT symbol)                            : 0
  Single high impulse noise event ratio               
  upstream(0.001)                                 : 0
  Minimum impulse noise protection against           
  repetitive electrical impulse noise                 
  upstream(DMT symbol)                            : 0
  Minimum impulse noise protection against           
  repetitive electrical impulse noise transported     
  over DMT symbols with a subcarrier spacing of       
  8.625kHz upstream(DMT symbol)                   : 0
  Repetitive electrical impulse noise                 
  inter-arrival time upstream                         
  0-100Hz 1-120Hz(0~1)                            : 0
  Channel initialization policy selection         : 0
  ------------------------------------------------------------------------------


Have they told you the distance from your cabinet?

cheers, a

[1] http://www.kitz.co.uk/adsl/linestats_explanation.htm

[colly05]

No. Only the estimated distance I worked out.
So far I'm pleased but would always like more.
Thanks.

[colly05]

estimate of 750m distance

[asbokid]

Looks about right then. In fact it's pretty good if the loop length is 750m.  On thinkbroadband there's a speed prediction table for gauging a rough rule of thumb:

http://www.thinkbroadband.com/guide/fibre-broadband.html

Lots of variables to consider though. The quality of the pair is important, and of course there's crosstalk to consider.

Any idea of the demographics to your area?  Just to try and judge the take-up of FTTC.

I would expect (albeit with no proof) that areas where older people tend to live generally enjoy higher sync speeds. Because take-up of FTTC tends to be lower (ageist assumption!) and, consequently, crosstalk is less of an issue in those areas.

Then again, perhaps that assumption is false because in the current climate, older people tend to have higher levels of disposable income to spend on broadband upgrades, and other non-essentials.
cheers, a

EDIT: Maybe to discover the quality of your pair, and the impairments on it, you could study the data gathered and graphed by tools developed by Eric (Roseway) and Paul (Bald Eagle).  In particular, the QLN (background noise) and the Hlog (attenuation) graphs.

[colly05]

Is there a way to reset interleave or dslam ?

[Bald_Eagle1]

Is there a way to reset interleave or dslam ?

Your interleaving depth seems quite high.

If DLM doesn't adjust it or automatically or return your connection to fastpath, the only way is to request a DLM reset/recalc via your ISP.
However, ISPs can't actually physically do this as it is fully controlled by Openreach.

There is every likelihood the request would be rejected as it is usually only granted following physical line repairs & even then it is sometimes rejected.

Visibility of a few days worth of 24/7 monitoring graphs along with the usual snapshot graphs at different times of day/night may just highlight a pattern to noise interference and/or physical line issues.

Overall though, at a quick glance, it seems fairly good for a 750m or so line length.

[colly05]

ok final post
so is it worth asking plusnet to see if it can be reset  or should i leave it be
if any more info is needed let me know. didn't realise turning off modem while getting sorted where to put it would alter anything
(if it did ) just want to say thanks again for all advice and help