OTN Node Defect Detection Suppression During Out-Of-Frame States
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Solution Overview
Problem
In Optical Transport Network (OTN) systems, Out-Of-Frame (OOF) conditions lead to invalid defect detection, causing unnecessary resource consumption as conventional control elements cannot distinguish between valid and invalid defects, resulting in unnecessary actions and potential network instability.
Innovation Solution
A method and apparatus for suppressing invalid defect detection during OOF conditions by detecting the OOF condition, suppressing reports of associated defects, and canceling them once the condition clears, thereby preventing unnecessary network responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional control elements detect defects during OOF conditions, then defect detection sensitivity is improved, but network stability deteriorates due to unnecessary responses to invalid defects
Solution Approach 1:
The system performs preliminary detection of OOF conditions before defect detection occurs. By detecting the OOF state in advance and setting a suppression flag, the system prevents invalid defect reports from being generated during the out-of-frame period, thereby maintaining network stability while preserving defect detection sensitivity for valid defects.
Solution Approach 2:
The invention introduces an intermediary mechanism (OOF detection module and suppression flag) that mediates between the frame synchronization state and defect detection reports. This intermediary layer filters out invalid defect indications caused by OOF conditions while allowing valid defects to be reported, resolving the contradiction between detection sensitivity and network stability.
2Measurement precision
If defect reports are generated during OOF conditions, then defect detection coverage is improved, but resource consumption increases due to unnecessary network responses
Solution Approach 1:
The system extracts and identifies the specific portion of defect reports that are invalid (those occurring during OOF conditions) and removes them from the reporting stream. By suppressing only the invalid defect indications while maintaining reporting of valid defects, the system reduces resource consumption from unnecessary network responses without compromising overall defect detection coverage.
Solution Approach 2:
The system implements feedback through the suppression flag mechanism that monitors frame synchronization status and dynamically controls defect report generation. When OOF conditions are detected, the feedback loop activates suppression to prevent resource-wasting reports; when in-frame conditions return, normal defect reporting resumes, optimizing resource usage while maintaining detection coverage.
3Reliability
If control elements respond to all detected defects, then defect response completeness is improved, but network efficiency deteriorates due to unnecessary rerouting and protection switches
Solution Approach 1:
The system performs preliminary validation by checking frame synchronization status before generating defect responses. By pre-identifying defects that occur during OOF conditions as invalid and suppressing their reports, the system ensures that only valid defects trigger network responses, maintaining response completeness for legitimate issues while eliminating unnecessary rerouting and protection switches that reduce network efficiency.
Data Source
AI summary
Methods and systems can suppress invalid defect detection when Out-Of-Frame (OOF) conditions occur within an Optical Transport Network. One method for processing a report of a defect during an OOF condition may include detecting the OOF condition at a downstream node, detecting an indication of the defect caused by the OOF condition, suppressing a report associated with the indication of the defect, determining whether the OOF condition is clear, determining whether the indication of the defect is still present if the OOF condition is clear; and cancelling the report if the indication of the defect is not present. A network node which processes a report of a defect during an OOF condition may include a network interface, and a processor which is coupled to the network interface. The processor may be configured to perform a method for suppressing invalid defect detection during OOF conditions.