[e2e] Skype and congestion collapse.

[RJ Atkinson]

Earlier, Ran said, during a note about cable modem deployments:
>> It does not seem bogus to me, since often more than 100 active
>> users are sharing a 1.5 Mbps upstream channel; reasonable people
>> might have a range of differing views on this topic.

On Mar 5, 2005, at 17:47, Randy Bush wrote:
> indeed.  from japan, where unrestricted 100mb to the home or
> office is U$D20-40 per month, things look a bit differently.
> though end-users are still inbound biased, there is a variety
> of services being offered from the edge, and the domestic
> distribution is geographically wide.  cho et alia have a good
> measurement paper in press which offers a serious look at the
> results from the view of the networks of the significant isps.

A key difference is that the majority of metro network deployments in 
Japan
(and also Korea or Sweden, for that matter) are built out of Ethernet,
which offers symmetric bandwidth and does not have physics problems with
the upstream.  As near as I can tell, the metro networks in Japan 
generally
are over-provisioned in the core and fully provisioned with capacity to
the edge.

My comment which Randy quotes above was intended to be narrowly focused
on *cable modems*, where there is a physics problem with the shared
upstream bandwidth.  Even @Home Japan (which still exists) has an 
upstream
rate-limit on their cable-modem offering for this reason.

Apologies for being unclear.

Ran