Kitz Forum

Broadband Related => Broadband Technology => Topic started by: flanker on February 28, 2009, 04:20:08 PM

Title: Bits/tone question
Post by: flanker on February 28, 2009, 04:20:08 PM

Why is that after initial router sync when using Routerstats or DMT and looking at bits/tone graph there are very few gaps, always one at 64 and maybe one more where the graph tails off. At night time the SNR drops which I understand and more gaps appear in the bits/tone where the graph tails off. The next day SNR has recovered but the bits/tone gaps do not recover.

Title: Re: Bits/tone question
Post by: roseway on February 28, 2009, 04:30:02 PM

I guess that's down to how the router does bitswapping. It does the best job it can to optimise the bit allocation as noise conditions vary over time. But I'm waffling really, because I don't know. :)

Title: Re: Bits/tone question
Post by: jeffbb on February 28, 2009, 07:16:59 PM

Hi

Channel 64 is not used . as for the others its as Roseway says . see the following it might help.

http://www.kitz.co.uk/adsl/adsl_technology.htm#bit_loading

regards Jeff

Title: Re: Bits/tone question
Post by: flanker on February 28, 2009, 08:29:44 PM

Thanks for the link. I think I understand it now - as long as there isn`t a test  ;D

Title: Re: Bits/tone question
Post by: jeffbb on February 28, 2009, 10:37:08 PM

Ok  :lol:

Title: Re: Bits/tone question
Post by: kitz on March 04, 2009, 12:48:09 PM

 :lol: