[80620] in North American Network Operators' Group
Re: Acceptable DSL Speeds (ms based)
daemon@ATHENA.MIT.EDU (Mikael Abrahamsson)
Thu May 5 07:37:33 2005
Date: Thu, 5 May 2005 13:36:48 +0200 (CEST)
From: Mikael Abrahamsson <swmike@swm.pp.se>
To: Luke Parrish <lukep@centurytel.net>
Cc: nanog@merit.edu
In-Reply-To: <6.2.0.14.0.20050504085601.03616e20@mail.so.centurytel.net>
Errors-To: owner-nanog@merit.edu
On Wed, 4 May 2005, Luke Parrish wrote:
>
> Does anyone have a good resource for acceptable speeds for home DSL
> customers?
>
> I would like to see acceptable speeds from the customer CPE to the first
> layer 3 hop, the hop to the upstream and the hop that leaves the upstream
> network.
If your provider has their L3 equipment in the pop you're physically
connected to, you should have no problem getting less than 10ms RTT to
your first hop with small packets. Add to this any interleave configured
in the dslam (shouldnt be needed for regular ADSL, at least max 4 ms), and
then add any ATM path latency from the dslam to the BRAS (or whatever
first L3 equipment is on the way) if it's built that way.
For us, FAST-mode was ok for ADSL, but for ADSL2+ we needed to use 8-16ms
interleave for high-speed customers (generally the ones which got more
than 15-18megabit/s), otherwise they would get a lot of errored seconds.
--
Mikael Abrahamsson email: swmike@swm.pp.se
