Optical Transmission Path Switching Without Centralized Controller
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Solution Overview
Problem
In optical transport networks, especially in small network apparatuses without centralized controllers, fast switching from a work path to a protection path during failures often fails to meet specified time requirements due to the absence of controllers for centralized information exchange.
Innovation Solution
A transmission system design that includes first and second transmission devices connected via work and protection paths, respectively, with a communication device that detects switching information to notify both devices, causing the first device to stop relaying on the work path and the second device to start relaying on the protection path, enabling fast switching without a centralized controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a centralized controller is used for path switching, then switching reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the controller function from the transmission devices and implements it within the terminal devices themselves. Each terminal device independently monitors its own received signal quality and autonomously decides when to switch paths, eliminating the need for separate centralized controllers in small network apparatuses.
Solution Approach 2:
Terminal devices perform self-monitoring of signal quality (RSSI) and self-decision making for path switching. The system enables terminal devices to serve themselves by automatically detecting degradation and initiating switching without external controller intervention, reducing overall system complexity while maintaining reliability.
2Speed
If centralized controllers are deployed for fast switching, then switching speed is improved, but network cost and complexity increase
Solution Approach 1:
The patent enables terminal devices to autonomously monitor signal quality metrics (RSSI) and independently execute switching decisions without waiting for controller commands. This self-service mechanism achieves fast switching by eliminating controller processing delays and communication overhead, particularly benefiting small network apparatuses.
Solution Approach 2:
The control functionality is extracted from centralized controllers and embedded directly in terminal devices. This allows switching logic to execute locally at the point of need, dramatically reducing switching time and eliminating the complexity of deploying and managing centralized controller infrastructure.
3Loss of time
If terminal devices autonomously monitor and switch paths, then switching time is reduced, but false switching due to temporary fluctuations may increase
Solution Approach 1:
The patent implements a threshold-based monitoring mechanism where terminal devices continuously measure signal quality (RSSI) and compare against predetermined thresholds before initiating switching. This preliminary evaluation filters out temporary fluctuations that don't meet the threshold criteria, preventing false switching while maintaining rapid response to genuine degradation.
Solution Approach 2:
The system incorporates feedback mechanisms where switching decisions are based on continuous monitoring of signal quality metrics. The terminal device receives feedback about RSSI levels and uses this information to make informed switching decisions, ensuring that switching occurs only when necessary and improving both timing and accuracy.
Data Source
AI summary
A transmission system includes: a first transmission device that receives a first signal from the work path; a second transmission device, coupled to a protection path in a redundant configuration with respect to the work path, that receives a second signal from the protection path; and a first communication device coupled to the first and second transmission devices, wherein the first communication device, when detecting switching information from the first transmission device, notifies the first transmission device of first switching notification information and notifies the second transmission device of second switching notification information, the first transmission device stops relaying the first signal to the first communication device in response to the first switching notification information from the first communication device, and the second transmission device starts to relay the second signal to the first communication device in response to the second switching notification information from the first communication device.