National Standard Fiber Optic Drop Cable Model

The standard national model for FTTH fiber optic drop cables is typically the GJXFH/GJYXFH butterfly (figure-8) cable, compliant with ITU-T L.110 and YD/T 1997-2009 standards.

Overview

Fiber optic drop cables are the final segment connecting the distribution point to the subscriber's premises, delivering broadband, TV, and voice services. They are designed for high-speed, low-loss transmission and can be deployed aerially, underground, or indoors depending on environmental requirements .

Standard Models and Specifications

1. GJXFH / GJYXFH (Butterfly / Bow-Tie Drop Cable)
   • Structure: Flat figure-8 cross-section with two FRP (Fiberglass Reinforced Plastic) strength members flanking a single fiber in a central or offset groove.
   • Fiber Type: Typically G.657 bend-insensitive single-mode fiber, suitable for tight bends with a minimum radius of 20 mm .
   • Tensile Strength: ≥ 500N, providing crush resistance and durability.
   • Applications: Ideal for aerial self-supporting installations and short-distance indoor/outdoor connections.
   • Standards Compliance: ITU-T L.110 and YD/T 1997-2009 .
2. Indoor/Outdoor Dielectric Drop Cables
   • Structure: Single or multi-fiber in a dielectric tube, sometimes gel-free or gel-filled for moisture protection.
   • Fiber Count: 1 to 12 fibers, depending on subscriber requirements.
   • Features: Low-smoke-zero-halogen (LSZH) or flame-retardant jackets, suitable for indoor risers and outdoor exposure .
3. Armored or Rodent-Resistant Drop Cables
   • Structure: Includes metallic or aramid strength members for underground or direct-burial applications.
   • Protection: Water-blocking layers and crush-resistant jackets for harsh environments .

Deployment Considerations

• Aerial Installations: Use self-supporting figure-8 cables with FRP or steel reinforcement.
• Underground Installations: Armored or rodent-resistant cables with water-blocking layers.
• Indoor Installations: LSZH or flame-retardant dielectric cables with bend-insensitive fibers.
• Termination Methods: Fusion splicing is preferred for permanent, low-loss connections, while connectors provide flexibility for ONTs or future reconfiguration .

Summary

The national standard model for FTTH drop cables is the GJXFH/GJYXFH butterfly cable, designed for durability, flexibility, and compliance with ITU-T and YD/T standards. Variants exist for indoor, outdoor, aerial, and buried applications, with fiber types, core counts, and reinforcements tailored to deployment scenarios. Proper selection ensures reliable high-speed connectivity and long-term network performance .