Multi-pair Cable Varying Lay Length Alien Crosstalk
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Solution Overview
Problem
The telecommunications industry faces increased crosstalk issues with high-speed signal transmissions in multi-pair cables, which hinders the improvement of transmission performance.
Innovation Solution
A multi-pair cable with a varying twist rate and a mean core lay length of less than 2.5 inches is developed, along with a double jacket structure that increases the center-to-center distance between cables, reducing alien crosstalk without additional shielding, and a patch cord design that minimizes crosstalk at connector assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-speed signal transmissions are implemented in multi-pair cables, then transmission speed and volume increase, but crosstalk occurrence increases
Solution Approach 1:
The patent applies dynamics by varying the twist rate along the length of the cable core rather than maintaining a constant twist rate. This dynamic variation in twist rate changes the spatial relationship between twisted pairs at different positions, thereby reducing crosstalk interference while maintaining high-speed signal transmission capability
Solution Approach 2:
The patent changes the physical parameter of twist rate along the cable length, creating a non-uniform twist pattern. This parameter change optimizes the electromagnetic coupling characteristics between pairs, reducing crosstalk without requiring additional shielding materials
2Object-generated harmful factors
If a double jacket structure is used to increase center-to-center distance between cables, then alien crosstalk is reduced, but cable diameter increases
Solution Approach 1:
The patent applies partial action by implementing the double jacket structure selectively rather than uniformly throughout, or by optimizing the thickness and configuration of the jackets to provide sufficient separation to reduce alien crosstalk while minimizing the overall cable diameter increase
3Object-generated harmful factors
If mean core lay length is reduced to less than 2.5 inches, then crosstalk is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent implements a dynamic twist rate variation system that adjusts the twisting parameters during manufacturing to achieve a mean core lay length of less than 2.5 inches. This dynamic control system manages the complexity by automating the varying twist rate application, making the manufacturing process controllable despite the increased complexity
Data Source
AI summary
A multi-pair cable having a plurality of twisted conductor pairs. The twisted conductor pairs each have an initial lay length that is different from that of the other twisted conductor pairs. The plurality of twisted conductor pairs defines a cable core. The core is twisted at a varying twist rate such that the cable core has a mean lay length of less than 2.5 inches.