Twisted Pair Cable Lay Length Tuning for Low Delay Skew
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Solution Overview
Problem
Existing twisted pair data communication cables face challenges in improving data transmission rate and effective cable operating length without incurring high costs, increased manufacturing difficulty, and reduced flexibility and durability, which are associated with foaming of cable components or inclusion of cable shielding.
Innovation Solution
The proposed solution involves a communication cable with a cable core comprising twisted wire pairs with varying lay lengths and insulation layers containing a propagation speed modifier, such as titanium dioxide, to modify the delay skew and propagation speed, thereby allowing for greater differences in lay lengths without the need for additional shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If foaming of cable components or inclusion of cable shielding is used to improve data transmission rate and effective cable operating length, then data transmission rate and cable operating length are improved, but cost increases, manufacturing difficulty increases, and cable flexibility and durability are reduced
Solution Approach 1:
The patent applies local quality by modifying only specific portions of the cable structure - particular twisted wire pairs are assigned different lay lengths (e.g., first, second, third, and fourth lay lengths) while other pairs maintain standard configurations. This localized modification allows delay skew control without requiring global changes like foaming or shielding across the entire cable, thereby avoiding increased complexity, cost, and manufacturing difficulty while maintaining cable flexibility and durability.
Solution Approach 2:
The patent changes physical parameters of the cable by varying the lay lengths of different twisted wire pairs. Specifically, different twist rates (lay lengths) are assigned to different pairs to compensate for propagation velocity differences. This parameter adjustment achieves delay skew control and improves data transmission performance without introducing foaming agents or shielding structures, thus avoiding the associated drawbacks of increased complexity and reduced flexibility.
2Length of stationary object
If foaming of cable components or inclusion of cable shielding is used to improve effective cable operating length, then effective cable operating length is improved, but cost increases, manufacturing difficulty increases, and cable flexibility and durability are reduced
Solution Approach 1:
The patent applies local quality by modifying only specific portions of the cable structure - particular twisted wire pairs are assigned different lay lengths (e.g., first, second, third, and fourth lay lengths) while other pairs maintain standard configurations. This localized modification allows delay skew control without requiring global changes like foaming or shielding across the entire cable, thereby avoiding increased complexity, cost, and manufacturing difficulty while maintaining cable flexibility and durability.
Solution Approach 2:
The patent changes physical parameters of the cable by varying the lay lengths of different twisted wire pairs. Specifically, different twist rates (lay lengths) are assigned to different pairs to compensate for propagation velocity differences. This parameter adjustment achieves delay skew control and improves data transmission performance without introducing foaming agents or shielding structures, thus avoiding the associated drawbacks of increased complexity and reduced flexibility.
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 approach effectively reduces delay skew to 45 nanoseconds or less over 100 meters, enhances electrical performance by minimizing crosstalk, and meets higher qualification standards without the need for additional shielding, thus improving cable flexibility and durability.
Implementation Method 1
The propagation speed modifier comprises titanium dioxide. The insulation layer of each of the two insulated wires of the first twisted wire pair comprises 0.2% to 0.45% by weight of the propagation speed modifier.
Data Source
AI summary
Twisted pair data communication cables with modified delay skew values to improve electrical performance are disclosed. Methods of making and using the cables are also disclosed.