Optical communications – Fault recovery – Bypass inoperative element
Reexamination Certificate
2005-01-04
2005-01-04
Negash, Kinfe-Michael (Department: 2633)
Optical communications
Fault recovery
Bypass inoperative element
C398S003000, C398S005000, C398S045000
Reexamination Certificate
active
06839514
ABSTRACT:
Techniques for providing normal operation and service restoration capability in the event of failure of terminal equipment or transmission media in a heterogeneous network, such as a hybrid network containing single- and multi-wavelength lightwave communications systems. An optical switching node (OSN) is placed at each node in the ring network to provide the required connections between various fibers and terminal equipment, but having switch states that allow signals on the protection fibers to bypass the terminal equipment at that node. Ring-switched signals propagate around the ring on protection fibers without encountering the terminal equipment at the intervening nodes. To the extent that the protection fiber links between any given pair of nodes are incapable of supporting all the relevant communication regimes, such links are modified to provide such support.
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McAdams Larry R.
Sharma Rohit
Bhumralker Shailendra
Cammarata Michael R.
CIENA Corporation
Horace Ng
Negash Kinfe-Michael
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