Re: Very fast IP, no ATM...

[Jon Crowcroft <]

 >* We can run the world-wide telephone system say by IPv6     *
 >* > > over SDH?

you can run CBR services over Guaranteed Service - however to get the
jittler low enough over low speed links (c.f. Parekh's thesis, or
papers on the multi-node packet Generalized Processor Sharing
analysis) the admission test fails for utilisations that are
unacceptably low 
 
However, the IPv6 _backbone_ could VERY easily accomodate all the
worlds phone traffic in a few years time......the aggregated phone
reservations (i.e. trunk routed equivalent of ATM VPs, but IPv6
aggregatred flows) would work with high utilisation, sicne the number
of switch/router hops, and the line speeds are so high....

also, if all end systems become PC+mike+adaptive audio tool, you can
use the Controlled Load service, instread of the Guaranteed Service,
and get VERY high utuilisation (also with adaptive compression, you
only need 30% utilisation anyhow;-)

so, yes, Christian is right....its in the math:-)

 jon