OTU Frame De-mapping via Automatic Priority Selection
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Solution Overview
Problem
In Optical Transport Networks (OTNs), the manual configuration of de-mapping modes for OTU frames is complex and prone to errors due to different equipment manufacturers using various mapping modes, leading to link interruptions.
Innovation Solution
A de-mapping method and device that set a receiving reference clock and de-mapping path based on the highest priority OTU frame mapping mode, determining de-mapping priority through clock recovery results and customer service alarm instructions, and adjusting the mapping mode priority accordingly to ensure accurate and efficient de-mapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual configuration of de-mapping mode is used, then flexibility in selecting mapping modes is improved, but device complexity and error rate increase
Solution Approach 1:
The system automatically determines the de-mapping mode by analyzing the mapping mode indication information in the received OTU frame and matching it with local mapping mode information. This self-service mechanism eliminates manual configuration requirements while maintaining adaptability across different mapping modes (10GE->OTU2e, 10GE->OTU1e, 10GE->GFP->OTU2 non-pass-through preamble, 10GE->GFP->OTU2 pass-through preamble).
Solution Approach 2:
The system pre-stores multiple mapping mode information configurations locally before receiving the OTU frame. When a frame arrives, it quickly matches the received mapping mode indication against the pre-configured options, enabling rapid automatic determination without manual intervention during the de-mapping process.
2Adaptability or versatility
If manual configuration of de-mapping mode is used, then adaptability to different mapping modes is improved, but reliability decreases due to configuration errors
Solution Approach 1:
The automatic determination mechanism reads the mapping mode indication information directly from the received OTU frame and autonomously selects the corresponding de-mapping mode from local configurations. This eliminates human error in manual configuration while maintaining full adaptability to support all four mapping modes specified in ITU-T GSup43.
Solution Approach 2:
The system uses the mapping mode indication information embedded in the received OTU frame as feedback to automatically adjust and select the appropriate de-mapping mode. This closed-loop feedback mechanism ensures that the de-mapping configuration always matches the actual mapping mode being used, preventing configuration errors that would cause link interruptions.
3Productivity
If automatic determination of de-mapping priority is implemented, then productivity is improved, but measurement precision requirements increase
Solution Approach 1:
The system performs clock recovery on the received OTU frame and uses the recovery result as feedback to determine de-mapping priority. If clock recovery succeeds, the system proceeds with de-mapping; if it fails, the system adjusts priority and re-attempts. This feedback-driven approach enables automatic productivity improvement while managing precision requirements through iterative adjustment.
Solution Approach 2:
The system performs preliminary clock recovery operations before final de-mapping to assess signal quality and determine appropriate de-mapping priority. This preliminary assessment prepares the system by evaluating clock recovery results and customer service alarm instructions, enabling efficient automatic decision-making without requiring extremely high measurement precision at every stage.
Data Source
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AI summary
The present invention discloses a de-mapping method and a device for an Optical Transport Unit (OTU) frame. The method includes: setting a receiving reference clock and a de-mapping path according to a highest priority of an OTU frame mapping mode of a local device (S102); receiving an OTU frame of an opposite device by using the receiving reference clock and the de-mapping path (S104); determining a de-mapping priority of the OTU frame according to a clock recovery result of the received OTU frame and a customer service alarm instruction (S106); and de-mapping the OTU frame of the opposite device by using a receiving reference clock and a de-mapping path corresponding to the determined de-mapping priority of the OTU frame (S108). By means of the present invention, the de-mapping efficiency and accuracy of the OTU frame in an optical transport network are improved.