Optical Communication Master Station Backup Path RTT Calculation
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Solution Overview
Problem
In optical communication systems, the time required to resume communication through a backup path after a failure in the normal path is lengthy due to the need for registration processing and measurement of round-trip propagation time (RTT) for each slave station device, leading to increased downtime and communication delays.
Innovation Solution
The system calculates the backup path RTT based on the normal path RTT, partial RTT, and loop propagation time, allowing communication control processing to resume without directly measuring the backup path RTT for each slave station device, thereby reducing the time needed to resume communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If registration processing and RTT measurement are performed for each slave station device when switching to backup path, then communication reliability is improved, but communication resumption time increases
Solution Approach 1:
The system performs preliminary actions by measuring and storing the loop propagation time and partial RTT values in advance during normal operation. When a failure occurs and the backup path is activated, these pre-measured values are used to calculate the backup path RTT without requiring new measurements, thus enabling rapid communication resumption while maintaining reliability
Solution Approach 2:
The system creates a copy of the RTT calculation methodology by deriving backup path RTT from the relationship: backup path RTT = loop propagation time - normal path RTT + partial RTT. This allows the system to obtain backup path timing information without performing actual backup path measurements, effectively copying the timing data through mathematical derivation rather than physical measurement
2Measurement precision
If direct measurement of backup path RTT is performed for each slave station device, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The system uses mathematical derivation to copy RTT information from normal path measurements and pre-stored loop timing data. By calculating backup path RTT = loop propagation time - normal path RTT + partial RTT, the system obtains precise backup path timing without performing actual backup path measurements, thus maintaining measurement precision while dramatically improving resumption speed
Solution Approach 2:
The system performs preliminary measurement of the loop propagation time and partial RTT values during normal operation and stores them for future use. This preliminary action eliminates the need for repeated measurements when switching to backup path, thereby improving both the speed of communication resumption and maintaining measurement accuracy through pre-calculated values
Data Source
AI summary
Time taken for resuming communication in a protection scheme using a backup path in an optical communication system including a master station device and a plurality of slave station devices is decreased. The plurality of slave station devices are connected in parallel to a looped path. A communication path between the master station device and each of the slave station device includes a normal path and a backup path. The master station device performs communication control processing for each of the slave station device based on RTT. A first slave station device is a slave station device with which communication through the normal path has become impossible. First backup path RTT of the first slave station device is calculated based on first normal path RTT of the first slave station device, first partial RTT between the master station device and the looped path, and loop propagation time necessary for one trip through the looped path. The communication control processing for the first slave station device is resumed based on the calculated first backup path RTT without measurement of the first backup path RTT when the first slave station device is sensed.