Optical Power Threshold Filtering for Clock Switching
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Solution Overview
Problem
Conventional communication network technologies often result in incorrect switching of subnetwork connections due to faulty links or devices, leading to service interruptions and increased protection switching times, which can exceed the required 50 ms threshold.
Innovation Solution
An electrical layer subnetwork connection protection method that determines signal status information based on optical signal power, filters this information using preset thresholds, and switches clocks as necessary to ensure accurate connection monitoring, thereby reducing the likelihood of incorrect switching and optimizing protection switching times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fault transmission method is used, then service trail reliability is improved, but incorrect switching of subnetwork connection occurs
Solution Approach 1:
The patent segments the fault detection process into two independent parts: optical layer fault detection (using optical power thresholds) and electrical layer connection monitoring. By separating these functions, the patent prevents fault information from being incorrectly transmitted across layer boundaries, thus avoiding incorrect switching while maintaining reliability.
Solution Approach 2:
The patent introduces an intermediary mechanism where the optical receiver detects optical power and generates optical layer alarm information independently. This intermediary prevents direct transmission of potentially incorrect electrical layer monitoring information upstream, thereby resolving the contradiction between reliability and measurement precision.
2Loss of time
If protection switching is performed quickly, then service interruption is reduced, but switching time may exceed 50 ms threshold
Solution Approach 1:
The patent performs preliminary fault detection at the optical layer before electrical layer processing. By detecting optical power levels and generating alarm information in advance using dedicated optical receivers, the system prepares fault information locally, reducing the time required for upstream transmission and processing while ensuring the 50 ms switching threshold is met.
Solution Approach 2:
The patent replaces the conventional electrical signal-based fault detection mechanism with an optical detection mechanism. By using optical receivers to directly detect optical power levels and generate alarm information, the system eliminates the need for electrical signal conversion and upstream transmission, significantly reducing switching time while maintaining reliability.
3Speed
If clock switching is performed based on unfiltered signal status, then switching speed is improved, but incorrect clock selection occurs
Solution Approach 1:
The patent performs preliminary filtering of signal status information by comparing optical power levels against predefined thresholds before clock switching decisions are made. This preliminary action ensures that only accurate, validated signal status information triggers clock switching, preventing incorrect clock selection while maintaining switching speed.
Solution Approach 2:
The patent implements a feedback mechanism where the optical receiver continuously monitors optical power levels and provides real-time alarm information to the electrical layer. This feedback loop ensures that clock switching decisions are based on accurate, up-to-date signal status information, preventing incorrect switching while maintaining rapid response.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method effectively reduces the probability of incorrect switching and minimizes protection switching times by ensuring downstream devices receive accurate connection monitoring information, thus maintaining service reliability and adhering to the required switching time constraints.
Implementation Method 1
converting the optical signal into an electrical signal, and determining, by the network device, the signal status information based on an amplitude of the electrical signal
Data Source
AI summary
An electrical layer subnetwork connection protection includes determining, by a network device including a processor, signal status information based on a power of an obtained optical signal. The signal status information is used to indicate a state of a subnetwork connection carrying the optical signal. The method also includes filtering, by the network device, the signal status information based on a preset first threshold. The first threshold indicates a minimum duration in which the optical signal is in a valid state. The method further includes determining, by the network device based on the filtered signal status information, whether to switch a currently used first clock to a second clock different from the clock. The first clock or the second clock is used to initialize connection monitoring information in response to the determination of whether to switch the currently used first clock to the second clock.