OLT Upstream Anomaly Detection and Channel Switching
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Solution Overview
Problem
In passive optical networks (PON), upstream data anomalies, such as incorrect wavelength or subcarrier usage by ONUs, lead to service disruptions and reduced network quality, as existing solutions fail to effectively manage and correct these issues.
Innovation Solution
The Optical Line Terminal (OLT) detects abnormal upstream data and instructs ONUs to stop transmitting or change their physical channels, including wavelength or subcarrier, and switches them to alternative OLTs if necessary, to restore normal communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ONUs transmit upstream data in allocated time slots using TDM multiplexing, then bandwidth utilization is improved, but data transmission reliability deteriorates when wavelength or subcarrier anomalies occur
Solution Approach 1:
The OLT monitors upstream data from multiple ONUs and detects anomalies such as incorrect wavelength or subcarrier usage. When an anomaly is detected, the OLT sends feedback to the corresponding ONU to stop transmission or switch channels, resolving the contradiction by maintaining high bandwidth utilization while ensuring transmission reliability through active monitoring and correction
Solution Approach 2:
The OLT acts as an intermediary between multiple ONUs sharing the upstream channel. It mediates channel allocation and detects when ONUs use incorrect physical channels, coordinating the shared medium access to prevent conflicts while maintaining efficient bandwidth utilization across all ONUs
2Adaptability or versatility
If WDM-PON or OFDM-PON uses different wavelengths or subcarriers for each ONU, then service capacity is improved, but system complexity increases due to channel management
Solution Approach 1:
The OLT performs multiple functions: it allocates wavelengths and subcarriers to different ONUs for high service capacity, monitors upstream data for anomalies, and manages channel switching. This multi-functionality handles the channel management complexity centrally while maintaining high adaptability and service capacity across the network
Solution Approach 2:
The system dynamically changes physical channel parameters (wavelength, subcarrier) assigned to each ONU based on service requirements. The OLT monitors and detects when these parameters are misused, and can reassign them, providing flexible service capacity while managing parameter complexity through centralized control
3Reliability
If the OLT monitors and manages all upstream channels to detect anomalies, then service quality is improved, but detection and measurement difficulty increases
Solution Approach 1:
The OLT continuously monitors upstream data from all ONUs and provides feedback when anomalies are detected. The monitoring leverages the existing TDM/WDM/OFDM structure, detecting anomalies through pattern recognition in the multiplexed signal rather than requiring separate detection mechanisms for each channel, thus improving service quality without proportionally increasing detection complexity
Solution Approach 2:
The OLT combines monitoring of multiple physical channels (different wavelengths and subcarriers) into a unified detection process. By analyzing upstream data across the multiplexed structure together rather than separately, the system improves overall service quality while reducing the complexity that would arise from independent monitoring of each channel
Data Source
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AI summary
A method and an apparatus for processing upstream data abnormity are provided. The method includes: an Optical Line Terminal (OLT) detecting that upstream data is abnormal, the OLT instructing one or more Optical Network Units (ONUs) to stop transmitting the upstream data and/or instructing one or more ONUs to change a physical channel. By means of stopping ONUs from transmitting upstream data and/or changing the physical channels of ONUs, the present invention solves the problem of the upstream data abnormity in the related art, thereby can avoid the impact on normal service transmission of ONUs, and ensure the quality of the network service.