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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: ATM Utility
Jon 'Iain' Boone writes: > > On Mon, 31 Oct 1994, Vadim Antonov wrote: > > > >cost-effective in a number of applications today. In particular, > > >the cost of wide-area DS-3 ATM services can be very attractive > > >when compared to a number of point-to-point DS-3s. > > > > TAANSTAFL. You keep forgetting that underneath ATM there are the same > > SONET or clearline DS-3s/OC-3s etc. So, just by using IP routers > > instead of ATM switches you get 30% more bandwidth for the same price. > > ATM does not appear to make economical sense when applied to both > > data and voice communications. So, from the point of view of a user > > purchasing something carriers offer ATM may make sense (if carrier > > does not offer native IP) -- but from the point of view of a carrier > > ATM does not look that attractive. > > > > You still have to run IP over ATM (there's no such thing as native ATM > > applications yet), and the extra level of encapsulation does not bring > > anything worth 30% of bandwidth. > > > > In terms of real switching capacity (i.e. user data payload) the new > > generation of IP routers is pretty much close to ATM switches -- > > and quite cheaper. > > But, if you don't need the full 45 Mb/s, you can find a more > cost-effective solution in the wide-area Fast-packet services. In the > case of the MCI Hyperstream offerings, you don't have to pay for the > full amount of a circuit from point A to point B -- you simply pay a > monthly subscription fee and then a usage charge per Megabyte of data. > > So, you can build a multi-megabit/s backbone that is (say) 10 Mb/s and > not end up having to purchase the entirety of the DS3 circuits needed to > provision it. > Indeed. Vadim works for a phone company, where long haul SONET links are funny money. Not like the rest of us :-) --pushpendra Pushpendra Mohta [email protected] +1 619 455 3908 Director of Engineering +1 800 876 2373 CERFNet - - - - - - - - - - - - - - - - -
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