Communication Jack Single-Stage Crosstalk Compensation
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Solution Overview
Problem
Current communication jacks require multiple stages of crosstalk compensation due to phase differences, leading to increased complexity and manufacturing issues, such as degraded return loss and jack failures, as they attempt to cancel near-end crosstalk effectively across a range of signal frequencies.
Innovation Solution
A communication jack design with a single stage of crosstalk compensation, strategically located on a circuit board connected to the plug interface contacts, utilizing a minimal number of capacitors to achieve effective cancellation of near-end crosstalk, with a phase shift of up to 3.0 degrees at 250 MHz, thereby reducing the need for additional capacitors and improving production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two or more stages of crosstalk compensation are used to cancel near-end crosstalk effectively, then the bandwidth and crosstalk cancellation performance are improved, but the device complexity increases and manufacturing reliability deteriorates due to degraded return loss and jack failures
Solution Approach 1:
The patent changes the physical location parameter of the compensation capacitor from the traditional position (far from plug contacts) to a new position (close to plug contacts, specifically 0.020 inches away). This parameter change allows a single capacitor to achieve the same crosstalk cancellation effect that previously required multiple capacitors, thereby reducing device complexity while maintaining reliability
Solution Approach 2:
The patent extracts and eliminates the unnecessary second stage of compensation from the traditional two-stage compensation scheme. By taking out the redundant capacitor and stage, the invention simplifies the device structure while maintaining effective crosstalk cancellation through the optimized single-stage design
2Reliability
If two or more stages of crosstalk compensation are implemented, then the near-end crosstalk is cancelled more effectively, but the manufacturing precision requirements increase leading to jack failures
Solution Approach 1:
The patent changes the location parameter of the compensation capacitor to be much closer to the plug contacts (0.020 inches versus traditional farther positions). This parameter change reduces the electrical distance and phase difference, making the system less sensitive to capacitor value variations and manufacturing tolerances, thereby improving manufacturing precision requirements
3Speed
If additional capacitors are added for two-stage compensation, then the bandwidth is increased, but the return loss is degraded
Solution Approach 1:
The patent removes the additional capacitor from the two-stage compensation design, keeping only the essential single-stage compensation capacitor. This extraction eliminates the source of return loss degradation while preserving the necessary bandwidth through optimized single-stage compensation design
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
The single-stage crosstalk compensation effectively minimizes near-end crosstalk, enhances return loss, and improves communication channel performance by reducing the complexity and cost of the jack design, while maintaining compliance with CAT6 standards.
Implementation Method 1
at least one combination of said conductive path pairs including a single stage of crosstalk compensation with opposite polarity of said near-end crosstalk of said plug, said single stage of crosstalk compensation cancelling substantially all of said near-end crosstalk of said plug
Data Source
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AI summary
A communication jack has a housing with a face having a plug receiving aperture. A plurality of conductive path pairs extends from corresponding plug interface contacts located at the plug receiving aperture to corresponding output terminals. A first circuit board is connected to the plug interface contacts and a second circuit board is connected to the plug interface contacts and the output terminals. The first circuit board has a first single stage of crosstalk compensation with opposite polarity of the crosstalk of a plug for a first combination of the conductive path pairs. The second circuit board includes a second single stage of opposite polarity crosstalk compensation for some of the conductive path pairs not compensated on the first circuit board. The stages cancel substantially all of the crosstalk caused by the plug, for the signal operating frequencies, for corresponding combinations of the conductive path pairs.