ASU Duct Outdoor Fiber Optic Cable Duct Outdoor Fiber Optic Cable is a next-generation transmission medium engineered for maximum deployment flexibility. Bridging the gap between traditional aerial lashed cables and heavy-duty ADSS (All-Dielectric Self-Supporting) solutions, this cable excels in both duct conduit systems and short-span aerial environments. It delivers high bandwidth, mechanical resilience, and long-term reliability for FTTX, 5G backhaul, and metropolitan backbone networks.
Structural Design & Materials
At the core of the ASU cable lies a single loose tube containing 2 to 24 optical fibers (G.652D or G.657A1 compliant), filled with a water-blocking thixotropic compound to prevent moisture migration. The loose tube is helically stranded around a central FRP (Fiber Reinforced Plastic) strength member, providing exceptional tensile rigidity while maintaining bend flexibility. Two parallel non-metallic FRP rods are embedded beneath the outer sheath to serve as additional strength elements, enabling self-supporting aerial spans. The outer jacket is extruded from UV-stabilized HDPE (High-Density Polyethylene), offering superior abrasion, chemical, and rodent resistance. The entirely dielectric structure eliminates induced current risks and simplifies grounding procedures.
Key Performance Specifications
Fiber Count: 2–24 cores (standard)
Cable Diameter: 6.8 – 8.5 mm (varies by fiber count)
Weight: 50 – 75 kg/km
Maximum Tensile Strength: 1500 N (long-term) / 3000 N (short-term)
Crush Resistance: 1000 N/100mm
Operating Temperature: -40°C to +75°C
Storage Temperature: -50°C to +85°C
Attenuation: ≤0.22 dB/km @ 1310nm; ≤0.20 dB/km @ 1550nm
Primary Applications
Duct/Conduit Installation: The cable's compact cross-section and low friction jacket facilitate smooth pulling through existing micro-ducts (9–14mm inner diameter) in urban underground networks, reducing installation labor and blow-in air pressure requirements.
Short-to-Medium Span Aerial Deployment: Self-supporting capability allows spans up to 120–150 meters between poles or building facades, eliminating the need for separate messenger wires-ideal for rural access networks and campus interconnections.
Direct Burial (with additional protection): While primarily duct-rated, the robust HDPE sheath permits shallow direct burial when installed within protective conduits in non-rocky soil conditions.
FTTX Drop & Distribution: Widely deployed as feeder and distribution cables in Fiber-to-the-Home (FTTH) projects, connecting central offices to distribution points with minimal splice points.
Industrial & Utility Networks: Suitable for smart grid monitoring, traffic surveillance systems, and oil/gas pipeline communication links where EMI immunity is critical.
Core Advantages
Installation Versatility: One cable design serves three deployment methods (duct, aerial, and protected burial), reducing inventory complexity and procurement costs.
Lightweight & High Strength: Compared to traditional armored cables, the ASU offers comparable tensile performance at 30–40% less weight, translating to lower shipping costs and easier handling.
Superior Environmental Endurance: The HDPE sheath withstands prolonged UV exposure, temperature cycling, and moisture ingress, ensuring 25+ years of service life with minimal attenuation drift.
All-Dielectric Safety: Non-metallic construction eliminates lightning strike risks and avoids induced voltages when installed near power lines (up to 35kV), making it safe for co-location with electrical infrastructure.
Cost-Efficiency: Lower material and installation costs compared to ADSS cables for spans under 150 meters, offering an optimal balance of performance and capital expenditure for network operators.
FAQ
Q1: Can the ASU duct cable be directly hung between poles without additional support?
A1: Yes. The embedded FRP strength members enable self-supporting aerial installation with a maximum span of approximately 120–150 meters, depending on environmental loads (wind, ice, and temperature). For longer spans, additional messenger wire or pole reinforcement is recommended.
Q2: Is this cable suitable for underground duct installations with multiple bends?
A2: Absolutely. Its loose-tube construction and flexible jacket allow a minimum bending radius of 20D (static) and 10D (dynamic) during pulling, enabling easy navigation through 90° elbows and congested manholes without exceeding fiber strain limits.
Q3: What is the maximum fiber count available, and can it support Gigabit and 10G Ethernet?
A3: Standard configurations range from 2 to 24 fibers. It fully supports Gigabit Ethernet, 10G Ethernet, and even 40G/100G transmissions using CWDM/DWDM technologies, with low PMD (Polarization Mode Dispersion) characteristics ensuring high-speed signal integrity.
Q4: Does the all-dielectric design mean no grounding is required, even near high-voltage lines?
A4: Correct. Since the cable contains no metallic components (no armor, no copper), it does not conduct electricity. Therefore, no grounding or bonding is required, which simplifies installation and eliminates corrosion risks associated with ground connections.
Q5: How does the ASU cable perform in extreme cold or high-humidity coastal environments?
A5: The cable is temperature-rated from -40°C to +75°C and tested against salt spray, water immersion, and UV aging per IEC 60794 standards. The water-blocking compound and moisture-resistant jacket effectively prevent hydrogen-induced attenuation, ensuring stable performance in coastal, desert, and sub-zero regions.
With its unique combination of duct-compatible design, aerial self-support capability, and all-dielectric safety, the ASU Duct Outdoor Fiber Optic Cable delivers unmatched deployment agility and long-term value for tomorrow's high-bandwidth networks.