Dynamic Standby Path Selection in Optical Transmission Devices
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Solution Overview
Problem
Conventional uninterruptible switching in optical networks requires an equal number of resources for both active and standby system paths, leading to a large number of necessary resources and increased device size and cost.
Innovation Solution
A transmission apparatus and method that dynamically allocate resources by forming a standby system path only when a failure is detected, and adjusting delays to zero, thereby reducing the need for pre-allocated resources for standby paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standby system path with matched phase difference is prepared in advance, then uninterrupted switching is achieved, but the number of resources required increases
Solution Approach 1:
The patent implements dynamic standby path selection where the standby system path is not fixed but selected from multiple candidate paths based on current network conditions. The selection criterion is the phase difference between the active and standby paths, with the path having the smallest phase difference chosen as standby. This dynamic approach allows the system to adapt to changing conditions and reduces the need for multiple fixed standby paths.
Solution Approach 2:
The patent changes the selection parameter for standby paths from a fixed predetermined path to a dynamically selected path based on phase difference measurements. By measuring and comparing phase differences between the active path and multiple candidate standby paths, the system selects the optimal standby path. This parameter-based selection reduces resource requirements while maintaining uninterrupted switching capability.
2Reliability
If equal resources are allocated for active and standby paths, then phase difference matching is ensured, but device size and cost increase
Solution Approach 1:
The system dynamically selects the standby path based on measured phase differences rather than using a fixed predetermined standby path. This allows the system to achieve phase difference matching with fewer resources by selecting from multiple candidate paths based on current conditions, rather than maintaining equal resources for all possible standby configurations.
Solution Approach 2:
The system performs self-measurement of phase differences between the active path and candidate standby paths, and automatically selects the optimal standby path without external intervention. This self-service capability enables phase difference matching while reducing device complexity by eliminating the need for predetermined resource allocation for all possible standby scenarios.
3Reliability
If multiple standby paths are maintained, then switching reliability is improved, but the number of resources required increases
Solution Approach 1:
The patent implements dynamic standby path selection where only one standby path is actively maintained at a time, selected from multiple candidates based on phase difference measurements. This dynamic selection approach maintains switching reliability by ensuring the standby path has minimal phase difference with the active path, while significantly reducing the number of resources required compared to maintaining multiple simultaneous standby paths.
Solution Approach 2:
The system uses phase difference as a selection parameter to dynamically choose the optimal standby path from multiple candidates. By changing from a fixed multi-standby configuration to a dynamic single-standby selection based on phase difference measurements, the system achieves reliable switching with reduced resource requirements.
Data Source
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AI summary
A transmission apparatus includes a control unit for carrying out processing to secure a resource for a standby system path in response to detection of a sign of failure in an active system path.