DSL Interference Identification via Modem Data Correlation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Network operators face challenges in identifying and diagnosing power-line transmission interference (PLTI) affecting digital subscriber line (DSL) services, as existing methods are not practical for large networks and require dedicated equipment, limiting their ability to improve signal-to-noise ratio and error rates.
Innovation Solution
A method that collects modem data to determine traffic and noise measures over time intervals, correlates these measures to detect PLTI, and adjusts DSL profiles or parameters to mitigate interference, using standard DSL reporting statistics without additional hardware requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing PLTI detection methods are deployed, then PLTI can be identified at test sites, but dedicated equipment must be installed across the network which is impractical for large networks
Solution Approach 1:
The patent creates a virtual copy of the test equipment functionality by implementing the PLTI detection algorithm in software form that can run on existing modem infrastructure. Instead of deploying physical test equipment at each location, the detection capability is copied as executable code that operates on standard modem hardware, eliminating the need for dedicated hardware while maintaining detection precision.
Solution Approach 2:
The patent makes the detection system universal by designing it to run on existing modems that are already deployed throughout the network. The same modem infrastructure used for normal DSL communication is also capable of performing PLTI detection, eliminating the need for specialized dedicated equipment and enabling network-wide deployment without additional hardware installations.
2Measurement precision
If spectral noise characteristics of in-sync modems are studied to detect PLTI, then PLTI presence can be identified, but this approach is not practical for network operators with mixed modem populations
Solution Approach 1:
The patent implements self-service by enabling modems to automatically perform PLTI detection and reporting without requiring external test equipment or manual intervention. The modem itself generates and analyzes the spectral noise characteristics, and automatically reports findings to the network operator, making the process practical for large networks with diverse modem populations.
Solution Approach 2:
The patent establishes a feedback mechanism where modems continuously monitor their own spectral noise characteristics and automatically report PLTI conditions to the network operator. This feedback loop enables real-time detection and reporting without requiring manual testing, making the system practical for network-wide deployment across mixed modem populations.
3Loss of information
If dedicated modems are installed across the network to identify PLTI, then comprehensive PLTI diagnosis can be achieved, but the cost and complexity of replacing pre-installed equipment increases
Solution Approach 1:
The patent merges the PLTI diagnosis functionality with the existing modem infrastructure. Instead of installing separate dedicated test modems, the patent combines the detection, analysis, and reporting functions into the standard modem operations, allowing comprehensive PLTI diagnosis to be achieved using equipment already deployed in the network.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Interference on DSL (Digital Subscriber Lines) systems can be identified by collecting modem data and determining, for a plurality of time intervals, whether the line is carrying traffic and/or whether there are errors on the line. The presence of interference can be inferred from the correlation of the traffic data and the error data.