RF Ingress Detection in Coaxial Cable Networks
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Solution Overview
Problem
Cable networks are susceptible to electromagnetic noise (ingress) from external sources, which can impair upstream data transmissions, and existing testing methods are costly, complex, and inefficient, often failing to detect vulnerabilities during installation or troubleshooting when noise sources are not present.
Innovation Solution
A device with a radio frequency (RF) input and signal processor that scans RF signals for power levels across various frequencies, indicating ingress susceptibility, allowing for proactive identification and localization of poorly shielded cables or connectors in coaxial networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If field-testing is performed to locate ingress vulnerabilities, then the ability to identify and fix vulnerable points is improved, but the testing process becomes costly and complex
Solution Approach 1:
The patent extracts the essential function of ingress detection from complex dedicated RF test signal generating equipment. By using a simplified test apparatus that leverages existing noise sources in the environment rather than generating dedicated test signals, the invention removes unnecessary complexity while maintaining the ability to detect ingress vulnerabilities accurately.
Solution Approach 2:
The invention employs self-service by utilizing naturally occurring electromagnetic noise sources in the environment as test signals. Instead of requiring external complex test equipment to generate signals, the system uses existing ambient noise that is already present in the cable network, thereby simplifying the testing apparatus while maintaining detection effectiveness.
2Measurement precision
If dedicated RF test signal generating equipment is used, then test signal generation capability is improved, but cost and operational complexity increase
Solution Approach 1:
The patent employs inexpensive, readily available components rather than expensive dedicated test equipment. The test apparatus uses off-the-shelf RF input devices and signal processors that can be manufactured easily and at low cost, while still achieving sufficient measurement precision for ingress detection by leveraging existing environmental noise sources.
3Reliability
If testing is performed when noise sources are absent, then false positives are reduced, but vulnerabilities remain undetected during installation
Solution Approach 1:
The invention performs preliminary action by detecting ingress vulnerabilities during installation and troubleshooting phases, before noise sources become active. The test apparatus is designed to detect potential vulnerabilities even in the absence of strong noise sources, allowing proactive identification and correction of shielding issues before they cause service impairments.
Solution Approach 2:
The system applies preliminary anti-action by identifying and addressing vulnerability points before actual ingress problems occur. By detecting weak shielding during installation rather than waiting for noise sources to activate and cause interference, the system prevents future service disruptions and reduces the need for repeat service calls.
4Productivity
If existing testing methods are used, then some ingress detection is achieved, but detection efficiency and effectiveness are reduced
Solution Approach 1:
The patent introduces an intermediary approach by using the cable network itself as part of the testing system. The existing cable infrastructure and naturally present noise sources serve as intermediaries that facilitate detection without requiring complex external test equipment. This intermediary approach simplifies the measurement process while improving detection efficiency.
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
Enables effective detection and prevention of service impairments by identifying and fixing weak spots in the cable plant before noise sources become active, improving customer satisfaction and reducing repeat service calls.
Implementation Method 1
a signal processor operably coupled to the RF input, the signal processor operable to scan the RF signals for power levels at a plurality of frequencies
Data Source
AI summary
The testing device of the present invention includes an RF input for connecting to a subscriber network, which has been disconnected from a communication network, for receiving ingress RF signals leaked into the subscriber network from outside sources. The device includes a signal processor for scanning the RF signals for power levels at a plurality of frequencies, and generating power level signals based at least in part on the power levels. Ideally, the power levels are compared to a threshold power level representing an acceptable amount of ingress, and a pass/fail indicator is displayed based on whether the power levels exceed the threshold power level.