Fiber optic cable hanging rope

Fiber optic cables for aerial installation are typically supported by a messenger or hanging rope, with Figure-8 and ADSS cables being the most common types for long-distance and backbone networks.

Types of Aerial Fiber Optic Cables

Figure-8 cables consist of a fiber optic cable attached to a separate strength member, forming a shape resembling the number 8. This design allows the cable to be lashed to a messenger wire or pole infrastructure, providing tensile support while keeping the fibers protected from mechanical stress ( ). Figure-8 cables are widely used for CATV, broadband, and long-distance backbone networks. All-Dielectric Self-Supporting (ADSS) cables are designed to support their own weight between poles without a metallic messenger. They are suitable for installation near power lines and in areas where pole sharing is required ( ). Loose Tube Hanging Rope Cables are designed for aerial deployment with a dry, water-blocked structure. They often use non-metallic side strength members and Spider Web Ribbon (SWR) technology to reduce deployment time and simplify splicing ( ).

Installation Considerations

• Strength Members: Fiber optic cables include Kevlar aramid yarn or fiberglass rods as strength members. Pulling should only be done on these members to avoid fiber damage ( ).
• Pulling Techniques: Use swivel pulling eyes to prevent twisting, maintain the minimum bend radius, and avoid exceeding maximum pulling tension. For long runs, lubricants compatible with the cable jacket may be used, and automated pullers with tension control are recommended ( ).
• Support Intervals: Cables should be supported at regular intervals using cable ties, hangers, or Kellems grips. Ties should be snug but not tight enough to deform the jacket ( ).
• Environmental Protection: Polyethylene jackets with carbon black are commonly used for UV protection. Water-blocking systems improve resistance to moisture ( ).

Advantages of Hanging Rope Systems

• Cost-Effective: Reuses existing pole infrastructure, reducing the need for trenching or duct installation ( ).
• Rapid Deployment: Aerial installation is faster than underground deployment, especially in undulating or rocky terrain ( ).
• Flexibility: Figure-8 and loose tube designs allow for easy splicing, slack management, and future network expansion ( ).

Summary

Aerial fiber optic cables supported by hanging ropes, such as Figure-8, ADSS, or loose tube designs, provide a reliable and efficient solution for long-distance and backbone networks. Proper attention to strength members, pulling techniques, support intervals, and environmental protection ensures the longevity and performance of the fiber network. These systems are widely used for broadband, CATV, and data transmission applications, offering both cost and deployment advantages over underground installations.