Redundant Transmission Clock Control for Fast Delay Alignment
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Solution Overview
Problem
Existing non-instantaneous interruption switching devices face challenges in adjusting the clock frequency to eliminate delay differences between active and backup systems quickly, leading to prolonged maintenance operation times, especially when the path length difference is significant.
Innovation Solution
A transmission apparatus with a frequency adjustment range calculation unit that determines the optimal clock frequency adjustment range based on the frequency deviation accuracy of both transmission and reception side clock generators, allowing for precise control of clock frequency to minimize delay differences, thereby shortening the adjustment time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the clock frequency adjustment range is made small to ensure frequency deviation accuracy, then the frequency deviation accuracy is improved, but the maintenance operation time required for adjustment increases with increasing delay time difference
Solution Approach 1:
The patent implements dynamic adjustment of the clock frequency adjustment range based on the measured delay time difference. The frequency adjustment range calculation unit dynamically determines the appropriate adjustment range by considering both the frequency deviation accuracy requirements and the actual delay time difference, allowing the system to adapt the adjustment range rather than using a fixed small range. This resolves the contradiction by making the adjustment range flexible rather than static.
Solution Approach 2:
The patent changes the parameter of frequency adjustment range from a fixed small value to a dynamically calculated value based on delay time difference and frequency deviation accuracy. The frequency adjustment range calculation unit computes the optimal adjustment range by combining the frequency deviation accuracy requirement with the measured delay characteristics, enabling the system to use a larger adjustment range when needed while maintaining accuracy requirements.
2Loss of time
If the frequency adjustment range is increased to reduce maintenance operation time, then the maintenance operation time is reduced, but the frequency deviation accuracy may be compromised
Solution Approach 1:
The patent dynamically adjusts the frequency adjustment range parameter based on the measured delay time difference and frequency deviation accuracy requirements. The frequency adjustment range calculation unit computes an optimal range that is large enough to reduce adjustment time but constrained by the frequency deviation accuracy requirement, thus resolving the contradiction by finding the optimal balance between these two parameters.
Solution Approach 2:
The system uses feedback from the measured delay time difference and frequency deviation accuracy to dynamically determine the appropriate frequency adjustment range. The frequency adjustment range calculation unit receives information about the actual delay characteristics and adjusts the range accordingly, ensuring that the adjustment process is both fast and accurate based on real system conditions.
3Device complexity
If a fixed clock frequency adjustment range is used, then the device complexity is reduced, but the adaptability to different delay time differences is limited
Solution Approach 1:
The patent implements a self-adjusting clock system where the frequency adjustment range calculation unit automatically determines the appropriate adjustment range based on measured delay characteristics. The system performs self-diagnosis of the delay time difference and self-adjusts the frequency adjustment range accordingly, eliminating the need for manual configuration or complex external control while maintaining high adaptability to different delay conditions.
Data Source
AI summary
A first reception processing unit performs a process of receiving a first signal transmitted on a first transmission line, a second reception processing unit performs a process of receiving a second signal transmitted on a second transmission line, and an output speed control unit controls output speeds of the first signal and the second signal subjected to the reception process. A system switching unit selects and outputs the first signal or the second signal subjected to a reception process, and an output processing unit performs a process for output to another apparatus on the output from the system switching unit. A reception side clock output unit outputs a clock signal giving a processing timing of each process, and a clock frequency control unit adjusts a frequency of the clock signal giving the processing timing to the output processing unit. A frequency adjustment range calculation unit calculates an adjustment range of the frequency based on frequency deviation accuracy of the reception side clock output unit, frequency deviation accuracy of a transmission side clock output unit that outputs a clock signal giving a processing timing to a transmission process at a transmission apparatus on the transmission side, and a prescribed value of a frequency deviation.