ADSS (All-Dielectric Self-Supporting) cables are aerial optical cables designed to span between poles without steel wire, using non-metallic strength members for support.

Overview

Aerial optical cables without steel wire are typically self-supporting, all-dielectric cables that do not require a separate messenger wire for installation. These cables are designed for pole-to-pole deployment, often in environments where metal components could interfere with high-voltage lines or electromagnetic fields . They are lightweight, durable, and capable of spanning distances from 50 meters up to 500 meters depending on the design and environmental conditions .

Types and Construction

1. ADSS (All-Dielectric Self-Supporting) Cable
   • Uses non-metallic strength members such as aramid yarn or FRP (Fiber Reinforced Plastic) to provide tensile strength .
   • Optical fibers are typically loosely distributed in the core to minimize attenuation caused by cable deformation .
   • Can be installed along high-voltage power lines without electrical interference, making them ideal for utility networks .
2. Self-Supporting Figure-8 Cable
   • Features a figure-8 cross-section with the strength member forming one arm and the fiber core in the other .
   • Can span long distances without additional support and is suitable for harsh outdoor conditions.

Advantages

• No steel wire reduces the risk of electrical induction and corrosion.
• Lightweight and flexible, simplifying installation and reducing load on poles.
• Durable in harsh climates, including ice, snow, wind, and rain .
• Supports long spans without intermediate support, reducing infrastructure costs.

Installation Considerations

• Must maintain proper clearance from power lines according to safety codes .
• Can be installed using suspension clamps or tension clamps without a separate messenger wire .
• Route surveys are recommended to ensure adequate pole spacing and clearance.

Applications

• Utility networks along high-voltage transmission lines.
• Telecom networks in rural or urban aerial deployments.
• FTTH (Fiber to the Home) aerial installations where steel-free cables are preferred. In summary, aerial optical cables without steel wire, such as ADSS and figure-8 self-supporting cables, provide a reliable, lightweight, and electrically safe solution for overhead fiber deployment, especially in environments where metal components are undesirable or impractical .