Alien NEXT Cancellers for Switch Port Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing network apparatuses, such as switches, face interference issues between transport ports due to internal coil interactions, which affect signal quality and are not adequately addressed by conventional methods that only consider interference within the same transport port.
Innovation Solution
The implementation of a network apparatus with alien near-end crosstalk (NEXT) cancellers and a sample rate converter to eliminate interference from other transport ports, operating in either the time or frequency domain, and optionally using a detecting circuit to determine signal quality parameters for optimizing canceller placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple transport ports share a common transformer with multiple coils, then cost is reduced, but interference between adjacent transport ports increases
Solution Approach 1:
The patent converts the harmful alien NEXT interference from other transport ports into a beneficial signal by capturing it with alien NEXT cancellers, processing it through adaptive filters to generate cancellation signals, and subtracting it from the received signal. This transforms the harmful electromagnetic coupling between coils into a useful cancellation mechanism that improves signal quality while maintaining cost-effective multi-port designs
2Object-affected harmful factors
If conventional NEXT cancellers are used to eliminate interference within the same transport port, then interference from Echo and NEXT is reduced, but interference from other transport ports remains unaddressed
Solution Approach 1:
The patent segments the interference elimination function into distinct components: conventional NEXT cancellers handle interference within the same transport port, while alien NEXT cancellers handle interference from other transport ports. This segmentation allows each canceller to be optimized for its specific interference source while working together to provide comprehensive interference elimination across all transport ports
Solution Approach 2:
The patent introduces alien NEXT cancellers as intermediary components that specifically target and eliminate interference from other transport ports. These cancellers act as mediators between the harmful alien NEXT signals and the received signals, using adaptive filtering to generate and subtract cancellation signals, thereby extending the interference elimination capability beyond what conventional NEXT cancellers can achieve
3Object-affected harmful factors
If alien NEXT cancellers are added to eliminate interference from other transport ports, then signal quality is improved, but device complexity increases
Solution Approach 1:
The patent implements partial alien NEXT cancellation by selectively applying alien NEXT cancellers to specific transport ports or channels where interference is most problematic, rather than uniformly deploying them across all ports. This partial action approach achieves sufficient signal quality improvement in critical areas while limiting the overall increase in device complexity
Solution Approach 2:
The patent employs adaptive filtering in the alien NEXT cancellers that dynamically adjusts filter coefficients based on real-time signal conditions. This dynamic adaptation allows the cancellers to optimize their performance automatically, reducing the need for manual configuration and complex fixed-structure designs, thereby managing device complexity while maintaining effective interference elimination
Data Source
AI summary
A network apparatus for eliminating interference between transport ports includes a plurality of transport ports and at least one alien NEXT canceller. The alien NEXT canceller is coupled to a designated transport port of the plurality of transport ports for eliminating NEXT interference from other transport ports of the plurality of transport ports. The alien NEXT canceller operates in a time domain or a frequency domain. In one exemplary embodiment, the network apparatus is a switch.