ADS optical cable parameters

ADSS (All-Dielectric Self-Supporting) optical cables are designed for aerial deployment, combining high tensile strength, low fiber strain, and environmental resistance to support long spans without metallic elements.

Structural Features

ADSS cables are all-dielectric, meaning they contain no metal and can support their own weight between towers, typically up to 700 meters per span . The internal fibers are arranged in loose buffer tubes or ribbon configurations, often with excess slack to minimize strain . The cable core is reinforced with aramid yarns (Kevlar®) or FRP rods to provide tensile strength and stability . The outer sheath is usually polyethylene (PE) or PE-A, resistant to UV and arc-tracking in high-voltage environments .

Mechanical Parameters

• Rated Tensile Strength (RTS/UTS): The ultimate tensile strength of the cable, ensuring the load-bearing section can withstand stress without fiber breakage. The actual breaking force should be ≥95% of the calculated value .
• Maximum Allowable Tension (MAT/MOTS): The maximum tension under design weather conditions, keeping fiber strain ≤0.05% for stranded fibers and ≤0.1% for central tube fibers .
• Ultimate Operating Tension (UES): The short-term overload tension the cable can tolerate during its lifetime, with fiber strain limits of ≤0.35–0.5% to prevent permanent attenuation .
• Lightweight Design: ADSS cables are small in diameter to reduce load on towers, wind, and ice effects .

Optical Parameters

• Fiber Types: Single-mode fibers (G.652D, G.657A1/A2) are commonly used for long-distance or backbone communication .
• Core Counts: Typically 2–144 fibers per cable, with higher counts for backbone networks .
• Wavelengths: Standard operation at 1310 nm or 1550 nm, supporting circuits up to 100 km without repeaters .
• Fiber Protection: Thixotropic gel, water-blocking yarns, and tapes protect fibers from moisture and mechanical stress .

Environmental Resistance

ADSS cables are designed to withstand extreme weather conditions, including high winds, ice loading, and UV exposure . Dual sheaths and AT coatings are used in high-voltage areas to prevent electrical tracking . The cable maintains low optical loss throughout its service life due to minimal fiber strain and protective design.

Summary

ADSS optical cables are ideal for aerial installations along power lines, offering a combination of self-supporting strength, low fiber strain, high environmental resistance, and flexible fiber configurations. Key parameters to consider include tensile strength, maximum allowable tension, fiber type, core count, and environmental protection, ensuring reliable long-term performance in overhead applications .