Cable Network Test Instrument Intermittent Noise Detection
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Solution Overview
Problem
Cable network systems face significant noise interference in the upstream signal path due to external sources, making it difficult to locate and isolate intermittent noise, which affects the system's performance and reliability.
Innovation Solution
A cable network test instrument is developed to collect and analyze signal data at nodes within the system, identifying time periods with no carriers to detect intermittent noise, and using statistical and peak-hold analyses to determine noise presence, with visual indicators to pinpoint noise location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal level meters are used to measure ingress by physically connecting to test points, then measurement capability is provided, but device complexity and operational difficulty increase
Solution Approach 1:
The patent uses configuration messages as an intermediary to convey noise measurement data from the cable network system to the test instrument. Instead of directly physically connecting measurement equipment to test points, the system exchanges data through standardized configuration message protocols, eliminating the need for complex physical connections while maintaining measurement capability
Solution Approach 2:
The patent replaces mechanical physical connections with digital data communication. Instead of using physical signal level meters connected to test points, the system uses electronic configuration messages transmitted through the cable network's existing data communication infrastructure to convey noise measurement information, substituting mechanical measurement hardware with software-based data processing
2Difficulty of detecting and measuring
If spectral analysis and heat maps are used to locate noise, then noise location capability is provided, but processing time and computational resources increase
Solution Approach 1:
The patent performs preliminary actions by collecting and storing noise measurement data in configuration messages during normal system operation. The data is pre-processed and organized in a structured format before being requested by the test instrument, eliminating the need for real-time complex spectral analysis and reducing computation time when noise location is required
Solution Approach 2:
The patent creates a digital copy of noise measurement data through configuration messages that replicate the essential noise characteristics. Instead of performing time-consuming real-time spectral analysis, the test instrument requests and processes pre-captured noise data copies that contain sufficient information for accurate noise location without requiring extensive computational resources
Data Source
AI summary
Cable network test instruments are disclosed. The test instruments are configured to collect signal data at a node from a cable network system and analyze the collected data to determine whether intermittent noise is present. Methods of locating intermittent noise are also disclosed.