Richard Clark wrote:
snip
99% is actually pretty abysmal. Ma Bell could rightfully claim 5 9s
(99.999%) for service generations ago. Software bugs that 1% of your
user base encounters are evidence of incredible sloppiness.

snip
73's
Richard Clark, KB7QHC

And those days are gone, but not the way you'd think. Current Ericsson
cell switches in Europe run ERLANG, one of the successors of PLEX, and
they are getting 11 9's or better.

ERLANG is a very interesting language and has been released as open
source. See

http://erlang.org/

tom
K0TAR