Passive Noise Labeling Tags for Cable Network Ingress Localization
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Solution Overview
Problem
Cable network operators face significant challenges in efficiently localizing and isolating ingress noise, which impairs upstream communications and is costly to troubleshoot due to the iterative and disruptive nature of existing methods, lacking a simple and inexpensive solution.
Innovation Solution
Deployment of passive noise labeling devices, or 'tags,' at various nodes in the cable network that imprint a unique electrical signature on ingress noise, allowing identification at the headend without external control signals or power, and featuring a form factor compatible with standard cable network components for easy installation and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If iterative noise segmentation measurements are performed at each amplifier to locate ingress noise, then noise source identification is achieved, but technician work time increases significantly (taking up to 70% or more of workday)
Solution Approach 1:
The system performs preliminary noise measurements and segmentations automatically in the background before technician intervention is needed. The CMTS continuously monitors upstream signals and identifies noise sources, preparing diagnostic information in advance so that when a technician does need to troubleshoot, the heavy measurement work has already been completed, reducing their on-site time significantly.
Solution Approach 2:
The system implements continuous feedback loops where noise measurements taken at amplifiers are automatically analyzed by the CMTS, which then provides real-time guidance to technicians on where to next measure or what noise source has been identified. This automated feedback eliminates the need for technicians to perform iterative measurements manually, as the system continuously refines its noise source identification and communicates results back to operators.
2Loss of time
If fuse-pulling method is used to disconnect power to downstream amplifiers for noise testing, then troubleshooting time is reduced (15 to 45-minute savings per operation), but network service disruption occurs to all homes served by the downstream elements
Solution Approach 1:
The system introduces an automated diagnostic intermediary (the CMTS-based noise segmentation system) that performs the troubleshooting function without requiring physical disruption to the network. Instead of pulling fuses to isolate noise sources, the CMTS uses signal processing and automated measurements to identify noise origins, acting as an intermediary that achieves the same diagnostic goal without the harmful side effect of service disruption.
Solution Approach 2:
The patent replaces the mechanical fuse-pulling method with an electronic/software-based automated diagnostic system. The CMTS uses digital signal processing and automated measurements to perform noise segmentation, substituting the physical mechanical action of removing fuses with an electronic system that achieves the same troubleshooting objective without disrupting customer service.
3Measurement precision
If multiple tags are deployed at different nodes to label ingress noise, then noise localization precision is improved, but device complexity and installation cost increase
Solution Approach 1:
The system applies local quality by deploying tags with unique identification codes at specific geographic nodes or amplifier locations where ingress noise is most likely to enter the network. Each tag is placed strategically at a local position with a unique identifier corresponding to its location, allowing the CMTS to determine which segment of the network contains the noise source based on which tagged signal is detected, thereby achieving precise localization without requiring a complex array of tags throughout the entire network.
Data Source
AI summary
Ingress noise labeling tags are coupled into the signal path at various nodes of a cable network. The tags imprint a unique electric signature into a local ingress noise, making the noise identifiable at the headend of the network. In one embodiment, tags do not require external control signals to operate, the electrical response of the tags being determined by present and/or past magnitudes of the return path signal. Such tags can be made entirely passive, not requiring a control signal or an external source of electrical power.