Connector Crosstalk Compensation via Path Length Optimization
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Solution Overview
Problem
High-performance electrical connectors, such as RJ style plug and jack connectors, face significant Near End Cross Talk (NEXT) issues due to increased internet traffic and complex web applications, which existing technologies have not adequately addressed, especially in achieving TIA/EIA category six performance (CAT 6) standards.
Innovation Solution
The electrical connector design incorporates a printed circuit board with interconnecting conductors and spring contact conductors that provide crosstalk compensation signals between pairs of conductors, with a single crosstalk compensation element applied at or near the termination location, reducing NEXT noise to no more than -46dB at 250MHz by optimizing signal path lengths and phase delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If crosstalk compensation is provided using multiple compensation stages with different magnitudes and phases, then transmission performance is improved, but device complexity increases
Solution Approach 1:
The crosstalk compensation is divided into multiple stages, with a first compensation stage introducing compensation signals at a first magnitude and phase, and a second compensation stage introducing compensation signals at a second magnitude and phase. This segmentation allows systematic control of crosstalk across different frequency ranges, improving transmission performance while maintaining manageable device complexity through modular compensation architecture.
Solution Approach 2:
The patent applies parameter changes by varying the magnitude and phase of compensation signals across different stages. The first compensation stage uses specific magnitude and phase parameters optimized for lower frequencies, while the second stage uses different parameters for higher frequencies. This parameter variation enables effective crosstalk compensation across the entire frequency spectrum without requiring overly complex circuitry.
2Reliability
If spring contact conductive path length is reduced to 6.7mm or less, then crosstalk compensation effectiveness is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a precise parameter range for the spring contact conductive path length (6.7mm or less, preferably 6.2mm or less). This parameter control is critical for achieving proper phase alignment of compensation signals with offending crosstalk signals. By defining this specific length range, the patent balances the need for effective crosstalk compensation with practical manufacturing capabilities, ensuring that the compensation signals are introduced at the correct phase relationship without requiring extreme manufacturing precision.
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 effectively reduces crosstalk noise to achieve high throughput transmission performance, meeting CAT 6 standards by minimizing NEXT and ensuring reliable communication across high-frequency signals.
Implementation Method 1
JP 64 1989 20690 (JP 690) discloses a modular telephone jack with a crosstalk prevention function where a capacitor is installed within a housing. A printed circuit board has traces connected to the capacitors and also connected between insulation displacement contacts (IDCs) and contact springs of the jack. In figure 4 an arrangement is shown wherein the traces are used to form a capacitor, to counteract the crosstalk.
Data Source
Figure 1~2
Figure 3A~3B
Figure 3C~3D
AI summary
An electrical connector is provided with a circuit board with interconnecting conductors respectively extending between spring contact termination locations and other termination locations. Sets of spring contact conductors are provided terminating at respective spring contact termination locations. Each of the spring contact conductors of the set of spring contact conductors has a plug contact zone and defines a spring contact conductive path from an associated plug contact zone to a respective spring contact termination location. The sets of spring contact conductors provide different conductive path lengths from an associated plug contact zone to a respective spring contact termination location.