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[burakkucat]

Ask to be put onto the 8ISNR9 profile . . . for testing purposes. 

[naheed]

thanks for the help guys have asked on the talktalk forum for what was needed and now awaiti ng reply from
OCE.

Got new stats from router


ADSL Mode    ADSL2+ 
     
Interleaving    On 
     
DSL Line Speed  up  469 kbps
  down  2573 kbps
     
Line Attenuation  up  38.2 
  down  61.0 
     
SN Margin  up  11.7 
  down  10.5 
     
Total Errors Seconds    915 

[GunJack]

hmmm...your downstream attenuation is not stable - it often varies by half a db between re-syncs, bt I've noticed 58-61dB in your stats...could be indicative of a line issue....

[coolsnakeman]

I see that the attenuation has been fluctuating this is surely not normal at all. Errored seconds are also pretty high. Was there not an increase in connection speed when this was put into the test port? Perhaps you have some dodgey internal wiring which is adding to the issues.

Gary

[burakkucat]

We really need to see a sequence Routerstats graphs covering a continuous three day period (at a minimum), with the modem/router connected via the test socket of the NTE5/A.

All we can say, at the moment, is that something is not right with naheed's connection. 

[GunJack]

haven't had my hands on one, does the 27
80 work with routerstats or DMT   DOubt it somehow....

[burakkucat]

   Oh, I did not think about the compatibility. That's a nuisance. 

[Blackeagle]

haven't had my hands on one, does the 27
80 work with routerstats or DMT   DOubt it somehow....

Routerstats lite is compatible with the DSL-2780 so its probably possible, with a little fiddling, to set up the full version also.

[GunJack]

haven't had my hands on one, does the 27
80 work with routerstats or DMT   DOubt it somehow....

Routerstats lite is compatible with the DSL-2780 so its probably possible, with a little fiddling, to set up the full version also.

not always possible unfortunately (from personal experience), but RS-lite will be good enough for this application I believe

[naheed]

have had profile changed to 9db and new reuslts of router stats

ADSL Mode    ADSL2+ 
     
Interleaving    On 
     
DSL Line Speed  up  442 kbps
  down  2147 kbps
 
  Line Attenuation  up  38.4 
  down  57.0 
     
SN Margin  up  11.9 
  down  12.1 

Total Errors Seconds    537 
 
     
 i have also changed mode to adsl and not adsl2 and stats are

ADSL Mode    ADSL2 
     
Interleaving    On 
     
DSL Line Speed  up  432 kbps
  down  2435 kbps
 
     
Line Attenuation  up  38.4 
  down  63.0 
 
     
SN Margin  up  12.0 
  down  10.7     
Total Errors Seconds    2 
 
     
 
   
 

   
 

[coolsnakeman]

Hmmmmmm better speeds on ADSL2 than ADSL2+....... Plus a higher attenuation on ADSL2 than ADSL2+. That to me seems to still be a bit back to front cause ADSL2+ surely offers a higher output. Anyone else agree with this. Good news however is there is a reduction in errors there but again how long did you leave it on for once the changes where made? I believe you are better being on an SNR target of 6db instead of 9db cause looking at the SNRM there is still room for more speed out of this. Only thing is you don't want to push it to much with it being a long line and that but no harm in testing it on a 6db target and if it becomes unstable then just get them to put it back to 9.

Gary

[burakkucat]

I am another person whose line performs better when the mode of the modulation is set to ADSL2 rather than ADSL2+. It really depends upon both the length and quality of the pair.

In my case, as I am unable to obtain a sync speed above 6 Mbps, experiments which involved forcing the connection to ADSL, ADSL2 and finally ADSL2+ mode, whilst monitoring the achievable sync speed, showed that ADSL2 was the best mode for my line.

The next step in the optimisation process was to examine the cyclical change in the SNRM over a number of 24 periods. Analysis of the results showed that I could easily tolerate a target SNRM of 6 dB. I suggested that naheed tried with a 9 dB target SNRM at first, as we have not seen how the margin changes over a 24 hour period.

The final piece of the jigsaw, for me, was to switch from fastpath to interleaved. Hence the 8ISNR6 profile that is applied to my Talk Talk fully LLU'd line.

[coolsnakeman]

BK,

Think i just like to push the line as far as it can go so i probably would have gotten it set to 6db to start off with and monitored for 24-48 hours and if i found the line was unstable i would of then got it put up to 9db target SNR. I see your point about ADSL2 and 2+ i do see some lines that perform way better on ADSL than ADSL2 or ADSL2+ i was more confused at the increase in attenuation between the 2 on his line cause i would of though attenuation on ADSL2+ would of been higher than ADSL2 but that line seems to be the other way about.

Gary

[kitz]

Its not unknown for some (longer)lines to perform slightly better on adsl2 rather than adsl2+... and better than on adsl1.

This observation was one that me and azzaka had a couple of years ago. I dont know why, but my theory is that adsl2 uses better bitloading and handles SNR better than adsl1..  yet adsl2 isnt opening up the whole spectrum like adsl2+.. so perhaps by blocking off the higher frequencies as totally unavailable has something to do with it.  Who knows?

As regards to naheeds line..  right from the starting posts, I really dont like how the atten seems to change at whim.  That shouldnt be happening. 

[burakkucat]

Absolutely agree, Kitz. Until such time a naheed is able to graphically monitor the line for a few days, we really don't know what is happening.