Recovered Traffic Readmittance Using Skew and Phase Alignment
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Solution Overview
Problem
Existing technologies face challenges in hitlessly reintegrating recovered traffic components into a group supporting partial survivability, particularly when one component fails, due to misalignment in phase and frequency, leading to potential data loss and corruption.
Innovation Solution
A circuit and method that utilize delay FIFOs and clock manipulation to equalize skew and phase align components, allowing hitless readmission of recovered components by substituting a replacement signal and adjusting the read clock rate of surviving components, while maintaining the write clock rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If recovered components are immediately reintegrated into the aggregate signal after failure recovery, then system productivity is improved by rapid restoration of full bandwidth, but phase and frequency misalignment occurs causing data loss and corruption
Solution Approach 1:
The patent applies preliminary action by measuring the skew of recovered components before they are reintegrated into the aggregate signal. The system calculates the time difference between when recovered components arrive and when they should arrive, then pre-adjusts the read clock rate to compensate for this skew. This preliminary measurement and adjustment ensures that when components are reintegrated, they are already synchronized, preventing data loss while enabling rapid restoration of full bandwidth.
2Reliability
If the read clock rate is manipulated to equalize skew of recovered components, then phase alignment is achieved enabling hitless readmission, but device complexity increases due to clock manipulation mechanisms
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the read clock rate parameter based on the measured skew of recovered components. The system calculates the appropriate clock rate adjustment to equalize the arrival time of recovered components with the expected timing, then manipulates the read clock rate to achieve this synchronization. This parameter adjustment enables phase alignment and hitless readmission of recovered components into the aggregate signal.
3Reliability
If replacement signals are used during component failure to maintain aggregate signal continuity, then reliability is improved through partial survivability, but data loss occurs when recovered components are reintegrated without proper skew equalization
Solution Approach 1:
The patent applies feedback by continuously monitoring the skew of recovered components as they return after failure, measuring the time difference between their actual arrival and expected arrival. This measured skew information is fed back to the clock manipulation mechanism, which then adjusts the read clock rate to compensate for the measured skew. This feedback loop ensures that recovered components are properly synchronized before reintegration, preventing data loss while maintaining signal continuity provided by replacement signals during the failure period.
Data Source
AI summary
Systems and methods for hitless readmittance of recovered traffic to a group supporting partial survivability include receiving a plurality of components, wherein each component of the plurality of components is a traffic flow having a frequency and phase of associated frame position, and wherein the plurality of components represent an aggregate signal; equalizing skew of the plurality of components; responsive to one or more failed components of the plurality of components, replacing the one or more failed components with an associated replacement signal; and, subsequent to the one or more failed components becoming one or more recovered components, hitlessly readmitting the one or more recovered components by modifying the skew until non-failed components and the one or more recovered components are phase aligned.