Network Impairment Localization Using Signal Encoding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for locating impairments in hybrid fiber-coax (HFC) networks, such as common path distortion and noise, are inefficient and disruptive, requiring additional devices and causing service interruptions, and often fail to accurately pinpoint sources due to inaccuracies in network maps and the need for additional signal transmission.
Innovation Solution
A system that uses encoder or marker devices deployed in the network to encode return path signals with an ID code, allowing for accurate identification of impairment locations without disrupting service or requiring additional signal transmission, using amplitude modulation and decoder units to decode the ID code and determine the impairment's source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional trial-and-error troubleshooting methods are used to locate impairments, then the source can be identified, but the process is extremely time-consuming and causes service disruption
Solution Approach 1:
The system performs preliminary actions by pre-deploying encoder devices at known locations throughout the network and continuously encoding return path signals with location identifiers. When an impairment occurs, the location is immediately identified by decoding the signal from the affected encoder, eliminating the need for time-consuming trial-and-error troubleshooting and avoiding service disruption.
2Reliability
If additional devices such as passive filters or DIB systems are installed to manage ingress, then noise mitigation is achieved, but device complexity and cost increase
Solution Approach 1:
The encoder devices perform multiple functions: they encode return path signals with location identifiers for impairment localization, and simultaneously serve as signal transmission devices. This multi-functionality eliminates the need for separate dedicated noise mitigation devices, reducing overall network device complexity while maintaining impairment management capabilities.
3Ease of operation
If network maps are used to locate impairments, then the process is simplified, but inaccuracies in network maps reduce localization precision
Solution Approach 1:
The system replaces the mechanical/manual process of matching impairment locations with network maps by using automatic signal encoding and decoding. Encoders at known network locations embed their identifiers into return path signals, and the system automatically decodes these signals to precisely identify impairment sources, eliminating reliance on potentially inaccurate network maps and manual troubleshooting processes.
4Measurement precision
If wink switches are deployed to assist in localizing noise sources, then impairment location can be determined, but additional devices and service disruption are required
Solution Approach 1:
The encoder devices are self-service in that they automatically and continuously encode return path signals with their location identifiers without requiring manual activation or control. When an impairment occurs, the system passively decodes the signal from the affected encoder to identify the location, eliminating the need for active control of wink switches and reducing device complexity.
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 solution enables precise and reliable localization of network impairments without service disruption or the need for additional devices, reducing downtime and operational costs, and is simple to install and maintain.
Implementation Method 1
using amplitude modulation and decoder units to decode the ID code
Data Source
AI summary
A system for locating an impairment in a coaxial cable network comprises an encoder, an impairment detector, and a decoder. The encoder couples to the network at a predetermined encoding point, upstream of the impairment. The encoder automatically encodes an identification code on a signal originating downstream of the encoding point and associated with the impairment. The impairment detector couples to the network at an access point, upstream from the encoding point, and receives signals from the network. The detector is adapted to detect from the received signals the signal associated with the impairment and generate a detected version of the signal. The decoder is adapted to decode the identification code from the detected version of the impairment signal. Once the identification code is determined, the encoder and encoding point are identified, and the location of the impairment is determine to be downstream of the encoding point.