Suspension-type optical cable

Suspension-type attached optical cables are supported on poles or towers using specialized suspension clamps that allow safe hanging while minimizing stress on the fiber.

Overview

Suspension-type optical cables, commonly used in ADSS (All-Dielectric Self-Supporting) networks, are designed to hang freely along poles or towers without metallic support, ensuring minimal bending and mechanical stress on the fibers ( ). These cables are typically installed along overhead power lines or telecom routes, where they must withstand environmental forces such as wind, ice, and vibration.

Suspension Clamps

Suspension clamps are the primary hardware used to support these cables. Key features include:

• Stress Reduction: They allow the cable to hang with controlled grip, reducing bending, compression, and clamping stresses on the optical fibers ( ).
• Materials: Modern clamps are made from aluminum alloy or anti-UV polymer, often with protective inlays to prevent abrasion ( ).
• Span Range: Depending on design, suspension clamps can support spans from 100 meters to 600 meters ( ).
• Installation: These clamps are designed for easy installation, often requiring no special tools, and can accommodate cable diameters typically between 8 mm and 20 mm ( ).

Tension and Anchor Clamps

In addition to suspension clamps, tension clamps (also called dead-end clamps) are used at the ends of spans or at points where the cable changes direction:

• Function: They form a rigid hold on the cable, transferring mechanical loads to poles or towers ( ).
• Design: Often include preformed helical rods and corrosion-resistant fittings to protect fibers from stress ( ).
• Applications: Used for terminal towers, corner towers, or tight-line tension points ( ).

Installation Considerations

• Long Spans: For high-voltage transmission lines or long spans, radio-controlled or motorized wrapping machines may be used to install the cable safely ( ).
• Mechanical Integrity: Proper selection of suspension and tension clamps ensures the cable maintains optical performance while resisting environmental forces ( ).
• Accessory Integration: Additional hardware such as fiber storage units (FSU), optical termination boxes, and grounding assemblies may be included to support network functionality ( ).

Summary

Suspension-type attached optical cables rely on specialized clamps and fittings to maintain mechanical and optical integrity. Suspension clamps allow safe hanging with minimal stress, while tension or dead-end clamps anchor the cable at critical points. Proper installation ensures long-term reliability, especially in challenging environments with long spans or high-voltage lines ( ).