Optical communications – Diagnostic testing – Fault detection
Reexamination Certificate
2007-07-10
2007-07-10
Sedighian, M. R. (Department: 2633)
Optical communications
Diagnostic testing
Fault detection
C398S003000, C398S004000, C398S012000, C398S050000, C398S056000
Reexamination Certificate
active
09907657
ABSTRACT:
A protection system protects paths of internetwork communication between WDM ring networks, and includes a plurality of optical wavelength multiplexing networks having a plurality of nodes and a network management system for monitoring conditions of the plurality of nodes. The nodes include a first node having add/drop functions of adding/dropping wavelength-multiplexed optical signals; a second node having a signal transfer function as well as the add/drop functions; and a third node having an internetwork connection function between the networks. Each first, second and third nodes further includes optical path cross-connect switches and a table for indicating conditions of the optical path cross-connect switches and a detected node fault condition. The network management system controls to set the optical path cross-connect switches in the first, second and third nodes so that the optimal optical path connection may be obtained according to the detected node fault condition indicated in the node tables.
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Dokai Masami
Konno Hiroki
Sato Kazuyuki
Fujitsu Limited
Sedighian M. R.
Staas & Halsey , LLP
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