Discontinuous Shield Tape for Twisted Pair LAN Cable Crosstalk
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Solution Overview
Problem
Existing LAN cables face challenges in reducing internal cross-talk between twisted pairs without the need for grounding, especially in high-bandwidth applications, and current discontinuous shielding solutions do not effectively address excessive unwanted signal coupling.
Innovation Solution
The use of discontinuous shield tapes with separated metal segments, folded and arranged between twisted pairs to create individual shielding and isolation, eliminating the need for grounding and enhancing bandwidth performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If continuous foil shielding is used around twisted pairs, then external interference and alien crosstalk are effectively prevented, but grounding becomes necessary which increases installation time and cost
Solution Approach 1:
The continuous foil shielding is segmented into periodic discrete sections along the cable length. This segmentation breaks the continuous conductive path into isolated segments that cannot sustain continuous signal coupling, thereby preventing alien crosstalk and external interference without requiring a continuous ground connection. The segmented shield achieves protection while eliminating the grounding step.
2Reliability
If full shields around each pair are used to meet strict bandwidth requirements, then internal cross-talk is reduced, but the cable becomes difficult to terminate in connectors
Solution Approach 1:
The shield is segmented into periodic discrete sections rather than forming a continuous wrap around each pair. This segmentation allows the cable to maintain shielding effectiveness for bandwidth performance while creating gaps that facilitate easier termination in connectors. The discrete sections can be more easily managed and terminated compared to continuous full shields.
Solution Approach 2:
Instead of providing continuous full shielding around each pair, the invention uses partial shielding with discrete sections spaced along the cable. This partial action provides sufficient shielding for internal cross-talk reduction and bandwidth performance while significantly reducing the complexity of connector termination.
3Loss of time
If discontinuous shielding tape with periodic breaks is used, then grounding is not required, but excessive unwanted internal signal coupling between pairs in the same cable is not adequately addressed
Solution Approach 1:
The shielding tape is segmented into periodic discrete sections along the cable length. These segmented shields are strategically positioned to provide isolation between individual twisted pairs, addressing internal signal coupling. The segmentation maintains the benefit of no grounding requirement while enhancing pair-to-pair isolation through proper placement and configuration of the discrete shield sections.
Solution Approach 2:
The discontinuous shielding tape is applied with varying characteristics at different locations along the cable. By adjusting the density, position, and configuration of shield segments in different regions, the cable provides optimized local isolation for each pair while maintaining overall performance. This local quality variation effectively addresses internal signal coupling without requiring continuous shielding.
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 isolates pairs within the cable, reducing internal cross-talk and external interference, allowing for higher category bandwidth standards without the need for grounding, while also simplifying the cable assembly process and improving flexibility.
Implementation Method 1
discontinuous shield tapes having a plurality of separated metal segments... separating each of the plurality of pairs from one another
Data Source
AI summary
A LAN cable is provided having a plurality of twisted pairs, a jacket surrounding the twisted pair and at least one discontinuous shield tape having a plurality of separated metal segments. The discontinuous shielding tape is folded and arranged between the plurality of twisted pairs, separating each of said plurality of pairs from one another.