Re: Very fast IP, no ATM...

[Jon Crowcroft <]

 >p.s.: ... if not the telephone system itself- would Christian prepare
 >         an analysis saying "a 600Mio participants Internet of `appropriate`
 >         capacity  with RSVP and IPng would allow for  concurrent
 >         AUDIO  (as Jon said) of phone quality  for everybody ..."  :-)

weel, for toll quality speech, we can get down to around 
16kbps per user, i.e. 4 per 64kbps, i.e. nearly 100 per 2Mbps, or
30,000 per 622Mbps...

now assume that out of the worlds 600M phones, 10% are active

and assume that most calls (say 90%) are local
then we need to tolerate a total of 6M calls....(this is WAY higher
than they actually do...)

assume that we build a path disjoint backbone, so continental locality
is also kept reasoanbly well (and timezones help anyhow) - we need to
support 600,000 calls  on an Internet trunk...

so we are out by 20 times right now.....

ok, so we put in a 16 fold replicated backbone global grid...then we're there
 
but there are 800k web browsers in the UK after our interntational
links anyhow, so we need to upgrade anyhow...

so they'd all suddenly get instantaeous reponse...

oh, the cost?

tricky one:-)


 >-------------------------------------------
 >On Dec 2,  2:28pm, Peter Lothberg wrote:
 >> Subject: Re: Very fast IP, no ATM...
 >> > p.s.: have you any measures of IP-level throughput over this link?
 >>
 >> 	Almost 2 moths of operation, 4h downtime and we have been
 >> 	running upto 120Mbit/s user traffic.
 >>
 >> 	(Traffic generated by traffic generators does not count, but
 >>          it's possible to fill it up to theoretical max.)
 >>
 >> 	It's just a releif to see this first link that have enough
 >> 	buffer memory to deal with the network burstiness and allow
 >> 	TCP to do it's job..
 >>
 >> --Peter
 >>
 >> > >On Monday 23 September 1996 00:15Z..
 >> > >
 >> > >Was the worlds first transatlantic 155Mbit native IP service brought into
 >> > >operation by Sprint/USA and Tele2/Sweden.
 >> > >
 >> > >The circiut wich is part of Sprintlink and ICMnet runs between the
 >> > >NY-Nap in Pennsauken, NJ, USA and Tele2 in Sweden and uses cisco
 >> > >packet-over-sonet/sdh technology. (Native IP over SDH/VC4)
 >>-- End of excerpt from Peter Lothberg
 >
 >

 jon