Appeal No. 2000-0330 Page 3
Application No. 08/684,871
Claim 18, which is representative for present purposes,
follows:
18. A packet switching telecommunications network
comprising:
a plurality of switching nodes between which
packets are transported by logic paths, one of said
logic paths being a main path between a first and a
second switching node, and
means for linking at least a substitute logic path
to said main path for transporting the same packets as
packets transported by said main path,
said second node comprising switching means for
switching from the main path to the substitute path,
characterized in that the second node further
comprises:
calculation means for calculating a time shift
between packets received on said main path and on said
substitute path, and
check means, responsive to said time shift, for
checking the switching to avoid packet losses or packet
duplications.
(Paper No. 9 at 1-2.)
The prior art applied by the examiner in rejecting the
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