Description
Duct Cables are engineered for installation inside underground or above-ground conduits, microduct systems and protective pathways used in modern fiber optic networks. These cables are designed to balance mechanical durability, optical stability and installation efficiency, enabling long pulling distances and smooth routing through ducts, subducts and multi-duct infrastructures. Their optimized construction ensures reliable performance in backbone, distribution and access segments where conduit protection is available but environmental conditions still demand high durability.
Used by telecom operators, utilities, broadband providers and data network integrators, duct cables form the core transmission layer of large-scale fiber deployments.
Performance Characteristics
Duct cables combine high optical performance with mechanical properties tailored for conduit-based installation. Their typical design features include:
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Single or multi loose tube constructions supporting fiber counts from 2F up to 288F or more
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SZ-stranded tubes for flexibility and uniform mechanical stability during pulling
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Dielectric central strength elements (FRP) for balanced core rigidity
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Aramid yarn strength members (ZN) when additional tensile capacity is required
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Gel-filled loose tubes for full longitudinal water blocking
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Low-friction polyethylene (PE) outer jackets optimized for duct and conduit movement
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Optional dry water-blocking designs for cleaner splicing and indoor transitions
These characteristics enable reliable installation in duct systems using blowing, pulling or jetting techniques.
Application Scenarios
Duct cables are designed for a wide range of conduit-based network routes, including:
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Telecom backbone and metro networks routed through multi-duct or subduct systems
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Distribution and feeder networks where long pulling distances require optimized jacket performance
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FTTx deployments feeding cabinets, nodes and distribution points
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Industrial and utility networks where ducts provide environmental shielding
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Campus and corporate networks with buried or building-entry conduit pathways
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Microduct installations using miniaturized cable constructions for high-density installations
Their smooth outer surfaces and controlled stiffness help prevent cable damage during duct pulling, blowing or jetting.
