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 lengthy due to the need for registration processing and measurement of new Round Trip Times (RTTs) for all disconnected slave station devices.
Innovation Solution
The master station device calculates the backup path RTT for each slave station device based on the normal and first backup path RTTs, allowing communication control processing to resume without executing registration processing for each disconnected device, thereby shortening the time to resume 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 performs preliminary actions by holding the normal path RTT and backup path RTT for a reference slave station device in advance. When a fiber disconnection occurs, the master station device calculates backup path RTTs for disconnected devices using these pre-stored values, eliminating the need for time-consuming registration processing and RTT measurement for each disconnected device.
2Measurement precision
If individual registration processing and RTT measurement are performed for each disconnected slave station device, then accurate communication control is achieved, but processing complexity and time consumption increase
Solution Approach 1:
The master station device creates copies of RTT information by calculating backup path RTTs for disconnected slave station devices based on the normal path RTT and backup path RTT of a reference device. This copying approach provides accurate RTT values for communication control without performing individual measurements, thereby reducing processing complexity and time consumption.
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 one of the slave station devices, and a second slave station device is a slave station device that cannot perform communication via the normal path. If a second slave station device is detected, the master station device calculates a second backup path RTT for the second slave station device based on the first normal path RTT and the first backup path RTT for the first slave station device and a second normal path RTT for the second slave station device. The master station device then resumes communication control processing for the second slave station device based on the calculated second backup path RTT.