Communications Jack Contact Wire Crossover for Crosstalk Compensation
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Solution Overview
Problem
Current communications connectors, particularly jacks, fail to effectively compensate for crosstalk between differential pairs, leading to interference in communication systems due to non-uniform conductor spacing and mode conversion issues, which are not adequately addressed by existing compensation techniques.
Innovation Solution
The design of communications jacks with a vertically-oriented wiring board and crossover segments in contact wires, specifically for pairs 3, 2, and 4, to reverse polarity and provide heightened stagger, enabling efficient differential-to-differential and differential-to-common mode crosstalk compensation, reducing alien NEXT and enhancing channel performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional conductor spacing and routing are used in communications jacks, then device complexity is reduced, but crosstalk between differential pairs increases due to non-uniform spacing and mode conversion issues
Solution Approach 1:
The patent applies asymmetry by implementing non-uniform spacing between contact wires, specifically positioning pair 3 contacts with heightened stagger relative to other pairs. This asymmetric configuration creates intentional unbalance that generates compensating crosstalk signals to counteract harmful NEXT and FEXT between differential pairs.
Solution Approach 2:
The patent employs inversion by introducing crosstalk compensation that deliberately adds unwanted crosstalk signals through the asymmetric contact wire configuration. This added crosstalk is designed to be equal in magnitude but opposite in phase to the harmful crosstalk, thereby canceling it out through destructive interference.
2Object-affected harmful factors
If contact wires are positioned with non-uniform spacing to compensate for crosstalk, then crosstalk compensation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by implementing heightened stagger specifically for pair 3 contact wires while maintaining different spacing for other pairs. This localized asymmetric positioning creates targeted crosstalk compensation for the most problematic pair combinations without requiring non-uniform spacing throughout the entire contact wire array.
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 configuration significantly reduces crosstalk between pairs 1 and 3, 2 and 3, and 3 and 4, while minimizing mode conversion, thereby improving channel performance and meeting higher standards for crosstalk compensation.
Implementation Method 1
the proximities and routings of the conductors and contacting structures within the jack and/or plug can produce capacitive and/or inductive couplings
Implementation Method 2
the proximities and routings of the conductors and contacting structures within the jack and/or plug can produce capacitive and/or inductive couplings
Data Source
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AI summary
Communications jacks include a housing having a plug aperture that is configured to receive a mating plug that is inserted along a horizontal plug axis and a vertically-oriented wiring board that is mounted substantially normal to the horizontal plug axis. First through fourth contact wires are mounted in the vertically-oriented wiring board, with the first and second contact wires forming a first differential pair of contact wires and the third and fourth contact wires forming a second differential pair of contact wires. At least a portion of the first differential pair of contact wires is positioned between the contact wires of the second differential pair of contact wires, and deflectable portions of the third and fourth contact wires include a crossover. Additionally, the fixed portions of the third and fourth contacts are spaced further apart vertically than are the fixed portions of the first and second contacts.