Acceptable DSL Speeds (ms based)

Thu May 5 11:36:48 UTC 2005

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 at swm.pp.se