WDM network and WDM network device
AssigneeNEC Corporation
InventorsShinobu Sasaki, Tatsuya Shiragaki, Shinya Nakamura, Takashi Yamazaki
Life of this patent
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Abstract
Disclosed is a WDM network which has: a lightwave path which connects between clients and each of which is provided with an overhead, and a sub-network which is defined by dividing the WDM network. In this WDM network, the sub-network has a partial lightwave path to go through the sub-network, the overhead has a partial lightwave path supervisory control information region which is terminated at both nodes of the partial lightwave path, and when a fault occurs on a lightwave path, the fault information of partial lightwave path including the position information of fault occurred is added to the partial lightwave path supervisory control information region of the overhead.
Claims5
A WDM network having a plurality of nodes comprising:
- a lightwave path which connects between clients, each of which is provided with an overhead, and
- at least one sub-network containing a subset of said plurality of nodes;
- wherein said sub-network includes at least one partial lightwave path from a first node to a second node of said subset of said plurality of nodes, said overhead includes a partial lightwave path supervisory control information region which is read at each of said first and second nodes of said partial lightwave path, and when a fault occurs on said at least one partial lightwave path in said sub-network, fault information of a partial lightwave path including fault position information is added to said partial lightwave path supervisory control information region of said overhead.
A WDM network connection node device between adjacent sub-networks of a multiple sub-network WDM network, comprising:
- a partial lightwave path supervisory control information terminating section which monitors a partial lightwave path supervisory control information region in an overhead;
- a signaling processing section which exchanges information for switching to another node in the sub-network when said partial lightwave path supervisory control information terminating section detects a fault on a first partial lightwave path;
- a switching control section which controls the switching from a first partial lightwave path to a second partial lightwave path based on said partial lightwave path supervising control information;
- and
- a path setting section which switches from said first partial lightwave path to said second partial lightwave path.
Dependencies are inferred from the claim text.