RJ45 Connectors With Multiple Contact Points for Crosstalk Compensation
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Solution Overview
Problem
As operating frequencies increase, RJ45 connectors face challenges in meeting crosstalk cancellation requirements due to the physical distance between crosstalk generation and compensation, leading to detrimental effects on near-end crosstalk (NEXT) performance.
Innovation Solution
The implementation of multiple contact points between plug contacts and jack interface contacts, along with additional plug contacts and PICs, allows for controlled delay and optimal positioning of capacitive and inductive compensation, creating a second plug/jack interface for improved NEXT compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional single contact point configuration is used, then device complexity is low, but near-end crosstalk performance deteriorates at high frequencies
Solution Approach 1:
The patent divides the single contact point into multiple contact points (first and second contact points) for each conductor connection. This segmentation allows independent positioning of compensating elements relative to each contact point, enabling precise control of compensation timing while maintaining manageable device complexity through modular contact point configuration.
Solution Approach 2:
The patent introduces a temporal dimension to the contact point configuration by positioning contact points at different distances from the compensating element. This creates multiple compensation zones along the signal path, allowing crosstalk compensation to occur at optimized time points for each signal pair, thereby improving NEXT performance without uniformly increasing complexity across the entire connector.
2Reliability
If compensating element is positioned far from crosstalk generation point, then device assembly is easier, but crosstalk cancellation effectiveness decreases
Solution Approach 1:
The patent applies different positioning strategies to different contact points and conductor pairs. Each contact point is positioned with specific local characteristics relative to the compensating element, allowing optimization of compensation effectiveness for each signal pair independently. This local quality approach ensures that the compensating element is positioned at the optimal distance for maximum effectiveness without requiring uniform positioning for all contacts.
3Manufacturing precision
If multiple contact points are implemented, then NEXT compensation precision improves, but manufacturing complexity increases
Solution Approach 1:
The patent incorporates the compensating element into the jack housing structure during manufacturing, positioning it in advance relative to the contact points. This preliminary action ensures precise compensation positioning is achieved during assembly without requiring complex post-assembly adjustments. The contact points are then positioned relative to this pre-placed compensating element, simplifying the manufacturing process while maintaining high precision.
Data Source
AI summary
Disclosed herein are various communications systems allowing for multiple contacts points between plug contacts in a communications plug and plug interface contacts (PICs) in a communications jack. In some disclosed implementations, a communications plug including a first and a second plug contact mated with a communications jack having a first and a second plug PIC may form a plurality of plug/jack interfaces. The plug/jack interfaces may form multiple current paths between the communications plug and the communications jack. When a signal propagates between the communications plug and the communications jack, it may be split in the communications plug between a first current path and a second current path, and recombined in the communications jack after traveling through the plurality of plug/jack interfaces.