Stranded Loose Tube Micro Air Blown Fiber Optic Cable GYFY

Air-blown cable (jetting) uses compressed air to push the cable through pre-installed micro-ducts at speeds up to 50–100 m/min, while traditional pulled cable relies on mechanical force and is limited to 30–60 m per pull. Air-blown installation reduces labor cost by 50–70% in long-distance or multi-duct networks, allows staged fiber deployment (blow more fibers later as subscriber demand grows), and minimizes cable mechanical stress — extending cable service life. It is the preferred method for backbone, access, and FTTH networks using micro-duct infrastructure.

Standard GYFY configuration supports up to 144 fibers (stranded loose tube design with 12 fibers per tube). Maximum single-blow distance depends on duct route: typically 1,000–2,000 m for straight routes with minimal bends, 500–1,000 m for typical urban access networks with multiple 90° bends, and 200–500 m for routes with multiple 180° bends. Blowing equipment pressure and cable-lubricant pre-treatment affect achievable distance. ZTO engineering team can advise on duct-route-specific blowing distance estimates.

Standard GYFY cable is designed for installation in 10/12 mm or 12/14 mm micro-ducts (10–12 mm inner diameter). Duct fill ratio should be 50–70% for optimal blowing performance — ZTO provides duct-size recommendations based on your cable outer diameter. Pre-installed micro-duct bundles (typically 1–7 ducts per bundle) are commonly deployed during road construction or building infrastructure projects, then GYFY is blown in later as subscriber demand materializes.

In brownfield projects with existing occupied ducts, GYFY is not directly applicable because the ducts are already full. However, for greenfield installations or projects with new micro-duct infrastructure, GYFY air-blown cable is the cost-effective choice. For brownfield upgrades, ZTO recommends slim duct-overduct solutions: install new micro-ducts inside the existing duct, then blow GYFY cables — this is a common technique for city network upgrades where trenching is too expensive.

Standard GYFY uses PE jacket. For indoor riser or plenum applications where fire safety is required, LSZH (Low Smoke Zero Halogen) versions are available meeting IEC 60332-1 (single cable vertical flame test) or IEC 60332-3C (bunched cable vertical flame test). Compliance with YD/T 769-2010, GB/T 9771-2008, and IEC 794 optical/mechanical specifications is standard across all configurations. Indicate your project’s fire-rating requirements at the time of quote to receive the appropriate jacket material recommendation.