Compact Armored Intermittently Bonded Ribbon Cable Design
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Solution Overview
Problem
Existing armored IBR cables are relatively large and difficult to manufacture, making them unsuitable for compact and cost-effective applications, particularly in traditional outside plant telecom installations where they are vulnerable to rodent attacks and dig-ups.
Innovation Solution
A compact optical fiber cable design featuring a central core with intermittently bonded ribbon (IBR) bundles, a protective layer, an armor layer, and an outer cable jacket, which includes a strength member and a uniquely colored bundling member for ease of identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional armored IBR cables are used to protect against rodent attacks and dig-ups, then reliability is improved, but cable size increases and manufacturing difficulty increases
Solution Approach 1:
The patent applies nesting by placing the IBR bundles within a protective layer, which is then surrounded by an armor layer, and finally enclosed in an outer jacket. This nested structure provides multiple layers of protection while optimizing space utilization, allowing the cable to maintain compact dimensions despite having multiple protective functions integrated into the design.
Solution Approach 2:
The patent uses composite materials by combining different protective layers (protective layer, armor layer, outer jacket) with the IBR bundles. The armor layer specifically uses corrugated steel tape or spiral interlocking steel/aluminum to provide rodent resistance and dig-up protection, while the protective layer and outer jacket provide additional mechanical protection and environmental resistance, creating a composite structure that achieves high reliability without excessive size increase.
2Reliability
If armor layer is added to protect against rodent attacks and dig-ups, then reliability is improved, but cable diameter increases
Solution Approach 1:
The patent employs thin film and shell structures by using a protective layer (0.1-1.0 mm thick) made from materials like polymeric tape, aramid yarn, or IGFR yarns, combined with a thin armor layer (0.2-1.0 mm thick) using corrugated steel tape or spiral interlocking steel/aluminum. These thin but robust layers provide effective protection against rodents and dig-ups while minimizing the increase in cable diameter, achieving a balance between protection and compactness.
3Reliability
If multiple protective layers are added to prevent rodent damage and dig-up damage, then reliability is improved, but manufacturing difficulty increases
Solution Approach 1:
The patent segments the cable into distinct functional layers: IBR bundles, protective layer, armor layer, and outer jacket. Each layer has a specific function and can be manufactured and applied independently. The protective layer can be wrapped or longitudinally placed, the armor layer can be applied as corrugated steel tape or spiral interlocking structures, and the outer jacket is extruded over these layers. This segmentation allows for specialized manufacturing processes for each layer, improving overall manufacturability despite the multi-layer structure.
Solution Approach 2:
The patent achieves multi-functionality by designing the protective layer and armor layer to serve multiple purposes simultaneously. The protective layer provides mechanical protection, water barrier (when coated with superabsorbent material), and structural support. The armor layer provides rodent resistance, dig-up protection, and additional mechanical strength. This multi-functional design reduces the need for separate specialized components, simplifying the overall manufacturing process while maintaining high reliability.
Data Source
AI summary
The present disclosure provides an armored cable (100) comprising a central core (102) comprising a plurality of intermittently bonded ribbon (IBR) bundles (104) enclosed in a protective layer (106), which is placed within an armor layer (108). An outer cable jacket (110) surrounds the armor layer (108), which optionally comprises at least a strength member (114).