Master Station Backup Path RTT Calculation
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Solution Overview
Problem
In optical communication systems, the time required to resume communication using a backup path after a fiber disconnection is prolonged due to the need for registration processing and measurement of new Round Trip Times (RTTs) for all disconnected slave station devices, leading to increased downtime.
Innovation Solution
The master station device calculates the backup path RTT for each slave station device based on the normal path RTT, loop RTT, and first RTT, allowing communication control processing to resume without executing registration processing for each device, thereby shortening the time to re-establish communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If registration processing and RTT measurement are performed for all disconnected slave station devices to enable backup path communication, then communication reliability is improved, but the time required to resume communication increases
Solution Approach 1:
The master station device calculates backup path RTTs for all slave station devices in advance, before any fiber disconnection occurs. When a disconnection happens, the pre-calculated RTT values are immediately available for use, eliminating the need for time-consuming registration processing and RTT measurement during the recovery phase.
Solution Approach 2:
The system prepares backup path RTT values in advance as a cushion against future disconnection events. By pre-computing and storing these RTT values, the system creates a buffer that can be immediately deployed when needed, reducing the impact of future failures on communication restoration time.
2Measurement precision
If individual RTT measurement is performed for each slave station device on the backup path, then communication control accuracy is improved, but the complexity of the resumption process increases
Solution Approach 1:
The master station device creates calculated copies of RTT values for backup path communication. Instead of performing new measurements, the system generates RTT values for the backup path by copying and adjusting the existing normal path RTT values, adding only a fixed loop RTT component. This maintains sufficient accuracy while dramatically simplifying the process.
Solution Approach 2:
The normal path RTT measurement serves multiple functions: it provides the baseline RTT value for normal operation and also serves as the foundation for calculating backup path RTT values. This multi-functional use of the same measurement data eliminates redundant operations and reduces process complexity.
Data Source
AI summary
The present invention enables shortening the time required for resuming communication in a protection method that uses a backup path in an optical communication system that includes a master station device and multiple slave station devices. The slave station devices are connected to a loop path in parallel. The communication paths between the master station device and the slave station devices include a normal path and a backup path. The master station device executes communication control processing with respect to the slave station devices based on the RTTs. A first slave station device is a slave station device that cannot perform communication via the normal path. If the first slave station device is detected, the master station device calculates a first backup path for the first slave station device based on a first RTT between the master station device and the loop path, a loop RTT required for one full lap on the loop path, and the first normal path RTT for the first slave station device. The master station device then resumes communication control processing for the first slave station device based on the calculated first backup path RTT.