Synchronizing CSF and BDI Signals with Optical Ramp-Up
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Solution Overview
Problem
Conventional optical transport networks experience false restoration triggers due to incomplete ramp-up processes in optical switch fabrics, leading to unnecessary restoration actions when failures are rectified, as fault indications are sent before optical signals have sufficient power to carry data traffic.
Innovation Solution
Implementing a controller that synchronizes Client Signal Failure (CSF) handling with the optical fabric ramp process, ensuring CSF clear and Backward Defect Indication (BDI) declare are only sent after the ramp-up process is substantially complete, preventing false restoration triggers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If fault indications are sent immediately when failures are rectified, then network recovery speed is improved, but false restoration triggers occur due to incomplete ramp-up processes
Solution Approach 1:
The system performs preliminary action by waiting for the ramp-up process to substantially complete before sending fault indications. The controller monitors the ramp-up process and only triggers restoration signaling after optical signals have sufficient power, preventing false restoration while maintaining timely recovery.
2Reliability
If the controller waits for the ramp-up process to complete before sending fault indications, then false restoration is prevented, but network recovery time increases
Solution Approach 1:
The controller implements feedback by continuously monitoring the ramp-up process status and using this information to determine when to send fault indications. This feedback mechanism ensures that restoration signaling is triggered at the optimal moment - after ramp-up completion - preventing false restoration while minimizing unnecessary delays.
Data Source
AI summary
A system and method is disclosed in which circuitry of a first controller of a first node on a first path within a transport network receives a first signal indicating a failure within the first path from a second controller. The first node is an end node of the first path. A first client signal failure clear signal is received from a second node upstream of the first node on the first path. The first client signal failure clear signal indicates that a non-restorable fault has been resolved such that the first path can be considered for carrying data traffic. The non-restorable fault is a failure at the source. Subsequent to receiving the first signal indicating the failure within the first path, a backward defect indication clear signal is transmitted to the second node, the backward defect indication clear signal indicating an absence of a failure in the first path.