All Dielectric: No metallic materials (e.g., steel wires, copper conductors) in its construction. This ensures electrical insulation, critical for deployment near high-voltage power lines (110KV to 500KV) where metal components would risk short circuits or interference.
Self-Supporting: The cable’s internal reinforcement can bear its own weight and external loads (wind, ice, UV radiation) without relying on additional support cables (e.g., messenger wires).
Central Buffer Tube: A single, thick tube made of PBT (polybutylene terephthalate)—a durable, chemical-resistant plastic that protects internal fibers. The tube is filled with water-blocking ointment (a gel-like substance) to prevent moisture ingress, a critical feature for outdoor aerial deployment.
Optical Fibers: Fibers (single-mode, e.g., G652D/G657A1, or multimode for short runs) are placed inside the buffer tube with a small “excess length” (typically 0.5–1%). This excess accommodates thermal expansion/contraction (when temperatures fluctuate) and prevents fiber stretching, which would degrade signal quality.
Reinforcement Layer: Wrapped around the central tube are high-tensile strength materials like aramid yarn (e.g., Kevlar) or fiberglass strands. These materials provide the “self-supporting” capability, enabling the cable to withstand its own weight and wind/ice loads (tensile strength ranges from 1,000–3,000 Newtons).
Outer Sheath: An extruded layer of either PE (polyethylene) or AT (Anti-Tracking) material, chosen based on the voltage of the nearby power lines:
PE Sheath: Used for low to medium voltage environments (≤110KV). PE is lightweight, UV-resistant, and cost-effective, making it suitable for rural power grids or telecom corridors with minimal electrical interference.
AT Sheath: Required for high-voltage environments (≥100KV, up to 500KV). AT (often a modified PE or EVA—ethylene-vinyl acetate) resists “tracking” (a phenomenon where electrical discharge creates conductive paths on the sheath surface, leading to damage).
Compact Size: Smaller diameter (typically 10–15mm) reduces wind resistance and makes installation easier in tight utility corridors.
Light Weight: Lower weight (100–200g/m) puts less stress on power poles, extending pole lifespan.
Cost-Effective: Fewer components (one buffer tube, minimal reinforcement) make it 15–25% cheaper than layered twist designs.
Superior Waterproofing: The single central tube with water-blocking ointment creates a seamless barrier against rain, dew, and humidity.
Rural FTTH (Fiber-to-the-Home) networks, where spans between poles are short (≤100 meters).
Low-voltage power grid communications (≤110KV), connecting substations to smart meters.
Industrial campuses (e.g., factories, refineries) with aerial corridors that require minimal cable clutter.
Central Reinforcement Member: A rigid core made of FRP (fiber-reinforced plastic) or high-strength aramid rod. FRP is non-metallic, lightweight, and offers exceptional tensile strength (up to 5,000 Newtons), making it ideal for long spans.
Loose Buffer Tubes: Multiple small PBT tubes (typically 3–6) are twisted around the central reinforcement. Each tube holds 12–24 fibers and is filled with water-blocking ointment or dry water-blocking tapes (for easier termination).
Water-Blocking Layer: Between the buffer tubes and the outer sheath, a layer of water-blocking yarns or tapes is added to prevent moisture from spreading if the outer sheath is damaged.
Reinforcement Layer: A thicker layer of aramid yarn or fiberglass is wrapped around the buffer tubes to boost tensile and lateral load resistance (critical for withstanding ice accumulation or strong winds).
Outer Sheath: Like central tube ADSS, layered twist designs use PE or AT sheaths—but often with a double jacket option for extra protection:
Single Jacket (ADSS-S): A single layer of PE or AT, used for medium spans (150–200 meters) and moderate environmental stress (e.g., suburban areas with mild wind/ice).
Double Jacket (ADSS-D): Two layers of sheath material (e.g., inner PE + outer AT) for extreme conditions. The inner layer provides moisture protection, while the outer layer resists UV degradation, abrasion, and tracking. Double jackets are required for long spans (200–300 meters) or harsh climates (e.g., northern regions with heavy ice, coastal areas with salt spray).
High Fiber Capacity: Supports 48–144+ cores, making it ideal for large-scale networks (e.g., power grid backbones, metro telecom links).
Long-Span Capability: Withstands heavier loads, enabling spans up to 300 meters—reducing the number of poles needed and lowering installation costs.
Flexible Installation: Compatible with multiple aerial methods (e.g., tangent poles, dead-end poles, suspension clamps), adapting to complex utility corridors.
Easy Fiber Management: Separate buffer tubes simplify fiber identification and termination, reducing maintenance time.
High-voltage power transmission lines (110KV–500KV), connecting regional substations for smart grid communications.
Metro aerial backbones, spanning long distances between urban data centers.
Harsh-environment deployments (e.g., mountainous regions, coastal areas), where double jackets and high tensile strength are critical.
UV Resistance: PE and AT sheaths include UV stabilizers, ensuring the cable retains strength and flexibility for 20–25 years (vs. 10–15 years for unprotected cables).
Ice/Wind Loads: High-tensile aramid reinforcement can handle ice loads up to 500N/m and wind speeds up to 150km/h (critical for northern or coastal regions).
Moisture Resistance: Water-blocking ointment/tapes prevent moisture ingress, a leading cause of fiber signal loss in aerial cables.
Substation Connectivity: ADSS links regional substations (110KV–500KV) to transmit real-time data on voltage, current, and equipment status—critical for grid stability.
Smart Metering: In residential and commercial areas, ADSS connects smart meters to utility headquarters, enabling remote monitoring of energy usage and reducing the need for on-site readings.
Fault Detection: ADSS carries data from sensors on power lines, helping utilities quickly identify and repair faults (e.g., downed lines, equipment failures) to minimize downtime.
FTTH Deployment: ADSS spans between utility poles to deliver high-speed internet to rural homes, bypassing the need for expensive trenching.
Cell Tower Backhaul: Connects remote cell towers to core networks, enabling 4G/5G coverage in underserved areas.
Data Center Interconnections (DCI): ADSS links urban data centers (e.g., in downtown areas) to support 100G/400G traffic, reducing latency compared to underground fiber.
Smart City Infrastructure: Connects traffic lights, security cameras, and IoT sensors to city control centers, powering smart traffic management and public safety systems.
Factory Automation: ADSS connects PLCs (programmable logic controllers) and robots, enabling real-time control of manufacturing processes.
Mining Operations: In open-pit mines, ADSS withstands dust, vibration, and extreme temperatures to link mining equipment to control rooms—critical for safety and efficiency.
Span Calculation: Determine the maximum span between poles (based on ADSS design—central tube for ≤150m, layered twist for ≤300m) and ensure poles can support the cable’s weight (including ice/wind loads).
Voltage Assessment: Choose the right sheath (PE for ≤110KV, AT for ≥100KV) to avoid tracking. For spans near 500KV lines, use double-jacket AT ADSS.
Hardware Selection: Use compatible aerial hardware (e.g., suspension clamps rated for ADSS’s weight, dead-end fittings for tension control).
Tension Control: Use a tension meter to ensure the cable is pulled with the correct force (1,000–3,000N for central tube, 3,000–5,000N for layered twist). Over-tensioning can stretch fibers, while under-tensioning causes excessive sag.
Sag Adjustment: Calculate sag based on temperature (cables sag more in hot weather) to ensure the cable doesn’t touch power lines or the ground.
Termination: Use fiber splicing equipment to terminate ADSS at poles or substations. Ensure buffer tubes are properly sealed to retain water-blocking ointment.
Optical Testing: Use an OTDR (Optical Time-Domain Reflectometer) to measure insertion loss and return loss, ensuring signal quality meets industry standards (insertion loss ≤0.3dB per splice).
Mechanical Inspection: Check for sheath damage, loose hardware, or excessive sag. Repair any issues immediately to prevent moisture ingress or cable failure.
Quarterly Visual Inspections: Check for sheath damage (cracks, abrasions), loose hardware, or bird nests (which can cause moisture buildup).
Annual Electrical Testing: For high-voltage deployments, test the sheath for tracking using a high-voltage detector—replace the cable if tracking is detected.
5-Year OTDR Testing: Re-test optical performance to identify signal degradation (e.g., from fiber aging or splice damage) and address issues early.
Extreme Weather Follow-Up: After storms, ice storms, or high winds, inspect ADSS for sag, damage, or displacement—repair immediately to avoid outages.
