| 摘要 |
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.
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