Hybrid Drop Cable Structure for Strength and Easy Separation
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Solution Overview
Problem
State-of-the-art hybrid drop cables lack the necessary strength and stiffness for various installation techniques and are not easily separable for connecting optical fibers and electric power conductors, limiting their deployment in diverse environments, such as 5G small cell installations in different locations like buildings, bus shelters, or pylons.
Innovation Solution
A hybrid drop cable design featuring a transmission unit with two insulated metallic conductors and an optical subunit of six or more fibers stranded together, surrounded by a sleeve, alongside a strength member that provides tensile strength and stiffness, with an outer sheath that allows for easy separation and installation using multiple techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a hybrid drop cable is designed without a strength member, then the cable structure is simpler and easier to manufacture, but the cable lacks the necessary tensile strength and stiffness for various installation techniques such as pulling, pushing, blowing, overhead, and duct placement
Solution Approach 1:
The cable is divided into distinct functional segments: a transmission unit containing optical fibers and conductors, and a separate strength member providing mechanical support. This segmentation allows each component to be optimized independently while maintaining overall cable performance.
Solution Approach 2:
The cable employs composite construction by combining different materials with complementary properties: the transmission unit uses optical fibers and metallic conductors for signal and power transmission, while the strength member uses high-strength materials for mechanical support. This composite approach resolves the contradiction between structural simplicity and mechanical strength.
2Reliability
If the optical fibers and electric power conductors are kept separate in different cables, then each cable can be optimized for its specific function, but the installation process becomes more complex and time-consuming
Solution Approach 1:
The patent combines optical fibers and electric power conductors into a single integrated transmission unit, allowing both signal transmission and power delivery through one cable. This merging eliminates the need for separate cable installations while maintaining functional optimization, directly resolving the time loss contradiction.
Solution Approach 2:
The transmission unit is designed as a multi-functional component that simultaneously handles optical signal transmission and electrical power delivery. This universal design allows a single cable to perform multiple functions, simplifying installation while maintaining the reliability benefits of optimized separate pathways.
3Reliability
If the cable is designed for specific installation environments only, then the cable can be optimized for those conditions, but the adaptability to different deployment scenarios is limited
Solution Approach 1:
The cable design incorporates universal features including a strength member for mechanical support, an integrated transmission unit for both optical and electrical functions, and an outer sheath for environmental protection. These multi-functional elements enable the cable to adapt to various installation environments and techniques while maintaining optimized performance.
Solution Approach 2:
The cable structure is designed to be dynamically adaptable to different installation methods and environments. The strength member provides consistent mechanical support across varying tension requirements, while the integrated transmission unit accommodates different routing scenarios, enabling deployment flexibility without sacrificing environmental optimization.
Data Source
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Figure 3a~3b
AI summary
It is disclosed a drop cable comprising a transmission unit, a strength member arranged alongside the transmission unit and an outer sheath surrounding the transmission unit and the strength member. The transmission unit comprises two insulated conductors and an optical subunit comprising six or more optical fibers, the optical subunit 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 unit.