[80616] in North American Network Operators' Group
Re: Acceptable DSL Speeds (ms based)
daemon@ATHENA.MIT.EDU (Andy Johnson)
Thu May 5 00:48:45 2005
From: "Andy Johnson" <andyjohnson@ij.net>
To: <nanog@merit.edu>
Date: Thu, 5 May 2005 00:52:23 -0400
Errors-To: owner-nanog@merit.edu
----- Original Message -----
From: "Barney Wolff" <barney@databus.com>
>
> On Thu, May 05, 2005 at 10:59:04AM +0800, Ong Beng Hui wrote:
> >
> > >When I switched from 1600/384 to 3000/768 dsl, download speed went up
to
> > >very nearly the promised 3Mbps, but latency to the first hop went from
> > >14 ms to 26 ms.
> >
> > Is there a reason for that ? that, latency goes up when bandwidth goes
up
> > for your case ?
>
> I assume it had to do with different settings for interleaving on the
> DSLAM, as some prior poster mentioned.
>
> --
> Barney Wolff http://www.databus.com/bwresume.pdf
> I never met a computer I didn't like.
Interleaved adds some error correction, allowing the connection to be more
resistant to interference (noisy lines), but at the expense of latency.
Fast-path is the other way data is sent, which obviously, is much faster,
I've personally seen less ~10ms for a loop around 11000ft.
--
Andy
