as above poster said.. backbone capacity.
dunno wht you mean about 400gig ??
there are now cisco routers with 64x 100gig ports my friend =) thats a shitload more than 400gig.
here in Aus they are trying to roll out 100mb fibre.
total crap I say.
what the hell do you need to download.. no wait... what the hell can you download at 100mbit/s
besides torrents or from mirror sites which usually hang off ISP's.
and 10gig.. or even 1gig.. jesus...
and yeah yeah people will say streaming video...
whatever.. I suspect actual network engineers and peopel who understand backbone capacity like posted above relise this stuff is just stupid.