Node device, communication system and method for redundancy configuration
AssigneeFujitsu Limited
InventorNaokatsu Ohkawa
Life of this patent
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Abstract
The present invention relates to a node device applied to BLSR, a communication system containing the node device and a redundancy configuration method for the node device. An object of the invention is to keep simplicity of 2F-BLSR, and implement span switching at the same level as that of 4F-BLSR. Therefore, the invention is equipped with a controller which substitutes when a failure occurs in a preceding transmission section of any one of the plural annular transmission lines but not in the rest of them, any reserve band of the rest of the annular transmission lines for the active band of the preceding transmission section with the failure therein.
Claims9
A node device disposed in each of a plurality of annular transmission lines whose transmission bands are assigned to an active band and a reserve band and each of which is bi-directionally formed of two optical fibers for transmission in different directions from each other, the node device comprising
- a controller substituting, when a failure occurs in a preceding transmission section of one of the plurality of annular transmission lines but not in the rest of the annular transmission lines, any reserve band of the rest of the annular transmission lines for an active band of the preceding transmission section with the failure therein.
A communication system comprising:
- a plurality of first node devices disposed in each of a plurality of annular transmission lines whose transmission bands are assigned to an active band and a reserve band and each of which is bi-directionally formed of two optical fibers for transmission in different directions from each other, the first node devices each comprising a controller substituting, when a failure occurs in a preceding transmission section of one of the plurality of annular transmission lines but not in the rest of the annular transmission lines, any reserve band of the rest of the annular transmission lines for an active band of the preceding transmission section with the failure therein;
- and
- a second node device disposed in any of the plurality of annular transmission lines which are configured as BLSR.
A redundancy configuration method for a node device which is disposed in each of a plurality of annular transmission lines whose transmission bands are assigned to an active band and a reserve band and each of which is bi-directionally formed of two optical fibers for transmission in different directions from each other, the method comprising the step of
- when a failure occurs in a preceding transmission section of one of the plurality of annular transmission lines but not in the rest of the annular transmission lines, substituting any reserve band of the rest of the annular transmission lines for an active band of the preceding transmission section with the failure.
Dependencies are inferred from the claim text.