ODUk Cross-Connect via Intermediate Frame Mapping
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Solution Overview
Problem
Current cross-connect methods in optical transport networks, especially in backbone networks, are complex and inefficient due to the need to encapsulate OTN services into SDH, resulting in low resource utilization and integration levels.
Innovation Solution
A method and apparatus for directly mapping services to ODUk, utilizing different ODUk time slot frames with varying padding areas, and performing cross-connect within intermediate frame structures, eliminating the need for SDH mapping and de-mapping, thereby optimizing bandwidth usage and integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If OTN services are encapsulated to SDH for cross-connect, then cross-connect granularity can be reduced, but processing complexity increases and resource utilization decreases
Solution Approach 1:
The patent extracts the unnecessary SDH mapping layer from the cross-connect process. By directly operating on ODUk frames without encapsulating to SDH, the solution removes the complex mapping/de-mapping operations while maintaining fine cross-connect granularity through ODUk-based time slot framing.
Solution Approach 2:
The patent segments the cross-connect operation into discrete time slot frames at the ODUk level. Each ODUk frame is divided into multiple time slots that can be independently controlled and switched, enabling fine-grained cross-connect without requiring full frame encapsulation to SDH.
2Manufacturing precision
If OTN services are encapsulated to SDH for cross-connect, then cross-connect granularity can be reduced, but resource utilization decreases
Solution Approach 1:
The patent removes the inefficient SDH encapsulation step that causes resource waste. By directly handling ODUk frames with their native time slot structure, the system eliminates unnecessary mapping operations and reduces processing resource consumption while maintaining fine cross-connect granularity.
Solution Approach 2:
The patent changes the operational parameter from SDH-based VCn framing to ODUk-based time slot framing. This parameter change allows direct manipulation of service data at the ODUk level, improving resource utilization by avoiding the overhead associated with SDH encapsulation and decapsulation operations.
3Adaptability or versatility
If SDH-based cross-connect is used, then existing cross-connect methods can be applied, but integration level and bandwidth utilization are insufficient
Solution Approach 1:
Instead of mapping OTN services to SDH for cross-connect, the patent inverts the approach by directly mapping services to ODUk frames. This inversion eliminates the intermediate SDH layer, improving bandwidth utilization by removing mapping overhead while maintaining compatibility with existing OTN service types through direct ODUk mapping.
Data Source
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AI summary
The present invention discloses a method for realizing cross-connect of optical channel data units (ODUk), which comprises: mapping the accessed services to the ODUk, and mapping the services mapped to the ODUk to the ODUk time slot frames according to the requirements of the time slot frames; mapping the ODUk time slot frames to the intermediate frame structures; performing the cross-connect for ODUk services in the intermediate frame structures. The present invention also discloses an apparatus for realizing cross-connect of ODUk. The present invention directly supports cross-connect of ODUk, so as to realize simple scheduling for the Optical Transport Network (OTN) services, and improve the resource utilization factor and the integration level.