OPTICAL FIBER CABLE SPECIFICATION (ADSS-Span= 100m)
5. Optical Fiber Cable Characteristics 5.1 The Mechanical and Environmental Performance of the Cable 5.2 Installation Conditions
ADSS Optical Cable Parameter Table
ADSS optical cables are designed for aerial installation with self-supporting strength, featuring key parameters such as tensile strength, maximum allowable tension, fiber type, and environmental tolerances.
Key Technical Parameters
| Parameter | Typical Values / Description |
|---|---|
| Fiber Type | Single-mode ITU-T G.652D |
| Fiber Count | Varies (commonly 12–48 cores, customizable) |
| Cable Structure | Loose tube with waterproof compound, aramid yarns for tensile strength, UV-resistant HDPE outer sheath |
| Ultimate Tensile Strength (UTS/RTS) | Calculated breaking strength; actual breaking force ≥95% of calculated value; safety factor considered (MAT ≈ 40% RTS) |
| Maximum Allowable Tension (MAT) | Maximum tension the cable can withstand during installation or long-term operation; typically 40–60% of RTS |
| Maximum Installation Tension (MIT/TL) | Maximum tension during installation; ensures no non-reversible damage to fibers |
| Thermal Elongation Coefficient (CTE) | Coefficient of thermal expansion for cable materials; affects sag and tension under temperature changes |
| Operating Temperature | Typically -40°C to +70°C |
| Short-term Loading | Cable can tolerate temporary overloads; fiber strain should remain within elastic limits |
| Pole Span / Maximum Span Length | Usually 50–400 m depending on cable weight and tension; long spans may exceed 1 km with proper design |
| Sag Characteristics | Initial sag and tension calculated based on span, weight, and environmental conditions |
| Water Tightness | Dry core with water-swellable materials to prevent water ingress |
| Outer Sheath | UV-resistant HDPE, black color standard |
| Mechanical Protection | Aramid yarns and glass fiber reinforced plastic (GRP) for peripheral strength |
| Attenuation | Measured at 1550 nm; additional attenuation ≤0.1 dB under short-term load |
| Service Life | Designed for 25 years under typical environmental conditions |
| Color Coding | Fibers identifiable by standard color sequence; tube color usually natural |
Notes on Installation and Performance
- ADSS cables are self-supporting, eliminating the need for metallic support structures.
- Tension management is critical: excessive tension can cause fiber attenuation, while too low tension may increase sag.
- Environmental factors such as wind, ice, and temperature fluctuations must be considered in span and sag calculations.
- Section length typically ranges from 50 to 100 meters, depending on fiber count and cable weight. Longer spans require careful tension and sag design.
- Compliance: ADSS cables follow ITU-T, IEC, and EIA recommendations for optical performance and mechanical reliability . This table provides a comprehensive overview of the mechanical, optical, and environmental parameters essential for the design, selection, and installation of ADSS optical cables.
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