Shielded Cassette for Cable Interconnect Alien Crosstalk Reduction

Solution Overview

Problem

Current cable interconnect systems face challenges in achieving high density connections while providing effective shielding between adjacent plug cavities, leading to reduced electrical performance due to bulky shielded modular jacks and inadequate shielding between receptacles.

Innovation Solution

A cassette design with a housing featuring metal walls and metallized shield elements that separate plug cavities, providing effective shielding between adjacent contact sets and enhancing electrical performance by reducing alien crosstalk and EMI.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If shielded modular jacks are used to provide shielding between adjacent plug cavities, then electrical performance is improved, but device density is reduced due to bulky housing

Engineering Contradiction:

Improveelectrical performanceVSAvoiddevice density

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The housing is segmented into multiple cavities with integrated shield walls between them. Each cavity is separated by metallized portions of the housing that act as shields, allowing individual shielding without requiring separate bulky shielded jack housings. This segmentation enables effective EMI shielding while maintaining compact form factor and high device density.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The shielding function is merged into the housing structure itself through metallized portions that form integral shield walls between cavities. Rather than adding separate shielding components to each jack, the housing combines structural support and EMI shielding functions into a single integrated design, reducing overall bulk while maintaining shielding effectiveness.

Inventive Principle:

Principle #5Merging (Combining)

2Productivity

If multiple receptacles are arranged in stacked configuration to increase density, then device density is improved, but shielding between adjacent receptacles is insufficient

Engineering Contradiction:

Improvedevice densityVSAvoidshielding effectiveness

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The housing incorporates metallized portions at specific locations between adjacent cavities to provide localized shielding where it is most needed. Rather than uniformly shielding the entire housing, metallized sections are strategically placed at cavity interfaces to block EMI between stacked receptacles, maintaining density while improving shielding effectiveness at critical points.

Inventive Principle:

Principle #3Local quality

3Reliability

If separate shielded modular jacks are installed in housing to provide shielding, then shielding between contact sets is improved, but manufacturing complexity increases

Engineering Contradiction:

Improveshielding between contact setsVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The shielding function is merged into the housing structure itself through metallized portions that form integral shield walls between cavities. Rather than adding separate shielding components to each jack, the housing combines structural support and EMI shielding functions into a single integrated design, reducing overall bulk while maintaining shielding effectiveness.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The housing serves multiple functions simultaneously: it provides mechanical support for receptacles, defines cavity boundaries, and provides EMI shielding through integrated metallized portions. This multi-functionality eliminates the need for separate shielding components, simplifying manufacturing while maintaining shielding effectiveness between contact sets.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 cassette design increases connection density and electrical performance by isolating adjacent contact sets with shield elements, improving signal integrity and reducing interference, thus meeting the higher performance requirements of modern networks.

Implementation Method 1

A cassette design with a housing featuring metal walls and metallized shield elements that separate plug cavities, providing effective shielding between adjacent contact sets and enhancing electrical performance by reducing alien crosstalk and EMI.

Methodology Applied

Scientific EffectElectromagnetic shielding: Faraday Cage

Data Source

PatentUS7878824B2Shielded cassette for a cable interconnect system

Publication Date: 2011.02.01 COMMSCOPE TECHNOLOGIES LLC

AI summary

A cassette includes a housing having a plurality of plug cavities that are separated from adjacent plug cavities by shield elements. The cassette also includes a contact subassembly having a circuit board and a plurality of contacts arranged in contact sets coupled to the circuit board. The contact sets are configured to mate with different plugs. The contact subassembly is loaded into the housing such that the contact sets are received in different plug cavities, wherein the contact sets are separated from adjacent contact sets by the shield elements.