Asymmetrical Separator for Communication Cable PSNEXT Reduction
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Solution Overview
Problem
High-speed signal transmission in UTP communication cables is hindered by Power Sum Near End Crosstalk (PSNEXT) due to similar pitches of pair units, leading to signal attenuation and delay, which existing solutions like shield films or pitch adjustments fail to adequately address without increasing cable diameter.
Innovation Solution
A communication cable design featuring a separator with asymmetric barriers that adjust the pitch differences between pair units, including a thicker second barrier to maintain effective separation and prevent PSNEXT, while optimizing cable size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shield film is formed between pair units to prevent PSNEXT, then crosstalk is reduced, but cable diameter increases
Solution Approach 1:
The patent extracts the shielding function from a continuous shield film and implements it through discrete separators positioned only where needed between specific pair units. This selective placement maintains crosstalk prevention while minimizing the amount of shielding material required, thus avoiding excessive cable diameter increase.
Solution Approach 2:
The patent applies different separator configurations at different locations within the cable. Specifically, separators are placed between certain pair units but not others, and the separator structure varies depending on the local crosstalk requirements. This localized approach prevents PSNEXT where critical while avoiding unnecessary shielding elsewhere, optimizing cable size.
2Object-affected harmful factors
If pitches of pair units are adjusted differently to prevent PSNEXT, then crosstalk is reduced, but cable structure becomes more complex
Solution Approach 1:
The patent employs asymmetric separator structures with different barrier thicknesses (first barrier and second barrier of different dimensions) to create unequal spacing effects between adjacent pair units. This asymmetric configuration naturally differentiates the pitches of pair units without requiring complex adjustment mechanisms, effectively reducing PSNEXT while maintaining structural simplicity.
3Speed
If higher frequency is used for high-speed transmission, then transmission rate increases, but PSNEXT and signal attenuation increase
Solution Approach 1:
The patent introduces separators as intermediary elements between pair units transmitting high-frequency signals. These separators act as mediators that prevent direct electromagnetic coupling between adjacent pairs, thereby reducing PSNEXT and signal attenuation effects that would otherwise limit high-speed transmission performance.
Data Source
AI summary
A separator for a communication cable includes a plurality of barriers formed in a radial direction so that at least two pair units, in each of which at least two insulation-coated wires are spirally twisted, are received in spaces formed by the barriers one by one so as to separate the pair units from each other. At least one of the barriers has a relatively greater thickness than the other barriers. Thus, a communication cable having the separator may prevent PSNEXT (Power Sum Near and Crosstalk) caused by interference between adjacent wires when a high frequency signal is transmitted through the wires.