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The function of auxiliary suspension wires for communication optical cables

The function of auxiliary suspension wires for communication optical cables

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Auxiliary suspension wires are used to support and stabilize aerial optical cables, ensuring mechanical protection, proper tension distribution, and minimal stress on the fiber.

Purpose and Function

Auxiliary suspension wires serve as support structures for aerial optical cables, such as ADSS (All-Dielectric Self-Supporting) and OPGW (Optical Ground Wire) cables. They help bear the mechanical load of the cable, reduce bending stress, and protect the optical fibers from damage caused by wind, vibration, or thermal expansion . These wires are often installed alongside the main cable to provide additional support at towers, poles, or corner points, ensuring the cable maintains its proper curvature and tension .

Key Components and Hardware

  • Suspension Clamps: These clamps attach the optical cable to the auxiliary wire, distributing grip evenly to prevent damage to the cable sheath and internal fibers. They also provide shock absorption and vibration damping .
  • Tension Clamps: Used at dead-end or corner points, tension clamps bear the longitudinal load of the cable, while suspension clamps support straight spans .
  • Mechanical Suspensions: Lightweight assemblies that support vertical, transverse, and longitudinal loads, accommodating line angle changes without affecting fiber performance .
  • Vibration Dampers and Armour Rods: These accessories reduce aeolian vibration and protect the cable from fatigue, especially in long spans or high-wind areas .

Design Considerations

According to ITU-T Recommendation L.89, auxiliary suspension wires and supporting poles must be designed to withstand vertical loads, wind, ice, and other environmental stresses. Proper design ensures the reliability of broadband services and the safety of high-position installations . The suspension system must maintain the cable's minimum bend radius and prevent excessive tension that could compromise optical performance .

Applications

  • ADSS Optical Cables: Auxiliary suspension wires are used to hang ADSS cables on towers or poles, protecting the aramid yarn reinforcement and distributing stress evenly .
  • OPGW Cables: Suspension wires support OPGW cables along high-voltage transmission lines, maintaining fiber integrity while carrying mechanical loads and providing lightning protection .
  • Ordinary Overhead Optical Cables: Auxiliary wires can provide additional support or guide the cable along specific routes, especially in long spans or angled installations .

Summary

Auxiliary suspension wires are essential for mechanical support, stress reduction, and long-term reliability of aerial optical cables. When combined with suspension clamps, tension clamps, and vibration control devices, they ensure safe installation, minimal fiber loss, and protection against environmental stresses, making them a critical component in modern communication networks .

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