Hybrid Drop Cable Layout for Tensile Strength and Easy Separation
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Solution Overview
Problem
State-of-the-art hybrid drop cables are not suitable for diverse installation techniques and environments, lacking the necessary tensile strength and stiffness for installations like overhead, duct, or façade, and face challenges in separating optical fibers from conductors for connecting radio access nodes in 5G small cells.
Innovation Solution
A hybrid drop cable design featuring a transmission core with insulated metallic conductors and optical sub-core, surrounded by a strength member and outer sheath, providing the required tensile strength and stiffness for various installations, with a diameter equal to or slightly larger than the transmission core, and allowing easy separation of components for connection to radio equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hybrid drop cable uses a compact design with transmission core only, then the cable diameter is reduced and ease of installation is improved, but the cable lacks sufficient tensile strength and stiffness for diverse installation techniques
Solution Approach 1:
The strength member is nested concentrically around the transmission core, with both components surrounded by a common outer sheath. This nested configuration increases tensile strength while maintaining a compact overall cable diameter, enabling the cable to withstand diverse installation techniques without significantly increasing size.
2Strength
If the cable uses a strength member with diameter significantly larger than transmission core, then tensile strength is improved, but the cable diameter increases and ease of installation deteriorates
Solution Approach 1:
The strength member is positioned specifically at the central axis of the cable, concentrating the tensile strength enhancement where it is most needed for installation handling, while the outer sheath provides uniform protection. This localized strengthening achieves high tensile strength without requiring a uniformly larger cable diameter throughout.
3Stability of the object's composition
If the cable is designed for specific installation environments only, then structural optimization is improved, but adaptability to different environments deteriorates
Solution Approach 1:
The cable design incorporates a strength member and outer sheath configuration that provides universal applicability across multiple installation environments including overhead, duct, and façade installations. The concentric structure with balanced strength distribution enables the same cable design to be optimized for various installation techniques without requiring environment-specific variations.
Data Source
AI summary
A drop cable includes a transmission core, a strength member arranged alongside the transmission core and an outer sheath surrounding the transmission core and the strength member. The transmission core comprises two insulated conductors and an optical sub-core comprising six or more optical fibers, the optical sub-core and the insulated metallic conductors being stranded together and surrounded by a sleeve. Moreover, a diameter of the strength member is substantially equal to or higher than a diameter of the transmission core.