wiretapping continues....
Vadim Antonov
avg at sprint.net
Thu Oct 27 18:43:37 UTC 1994
>> John Scudder then discussed some modeling he and Sue Hares have done
>> on the projected load at the NAPs. The basic conclusions are that the
>> FDDI technology (at Sprint) will be saturated sometime next year...
>MarkFedor/ColeLibby from PSI said there was a "quiet" admission that the old
>methodology was already "approved" for the SPRINT NAP.
This technology works *now* (Sprint NAP is already in production use)
and there is a clear path for upgrading it to practically unlimited
aggregate bandwidths:
1) replace FDDI concentrators with FDDI switch
(this gives us up to 1Gbps of total bandwidth
while limiting access to one full DS-3)
2) replace single FDDI with multiple FDDIs (realistically
with 2 or 3) -- allowing access at OC-3 speeds
3) build point-to-point bypasses between peers with
OC-3s or FDDI to take the traffic out of shared
medium.
We will hit limitations of the present/then-future routing technology
long before we'll exhaust the possibilities to increase the
NAP aggregate and access bandwidth by cheap incremental upgrades.
That's the whole point of Sprint NAP architecture. ATM/SMDS/Flame Delay
do not get even close to what we achieve (and ATM is not useful yet).
Load balancing between NAPs is necessary, but for entirely different
reasons -- first, because of capacity limitation on nation-wide
backbones and, second, to reduce latencies on cross-ISP traffic.
--vadim
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