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Drop cable splicing of drop cable

Specialty cable knowledge brief Published 25 Sep 2023

Prepared for preliminary research by the ZITHA SPECIALTY knowledge desk. Confirm fire performance, mechanical protection, loss budgets and installation requirements against current standards and product documentation.

Drop cable splicing is the process of joining two optical fibers to ensure a low-loss, reliable connection, typically using fusion or cold splicing techniques.Understanding Drop Cables

Drop cables are used to connect the distribution point of a fiber network to the end-user's premises. They come in several types:

  • Ordinary drop cable: Figure-eight structure with two parallel strengthening cores and a central optical fiber.
  • Self-supporting drop cable: Adds a steel wire for suspension, suitable for aerial installations.
  • Butterfly-shaped drop cable: Non-metallic strengthening cores with the fiber in the middle, available in indoor and outdoor versions . Understanding the cable structure is crucial because it affects how the fiber is prepared and spliced.
Splicing TechniquesFusion Splicing

Fusion splicing uses a fusion splicer to melt and join two fiber ends. It is the preferred method for drop cables due to:

  • Low optical loss: Provides excellent signal integrity.
  • Long lifespan: Comparable to the original fiber, reducing maintenance costs.
  • Durability: Less prone to contamination or damage compared to connectors . Fusion splicing is ideal for permanent connections, especially in greenfield installations where future rearrangement is unlikely.
Cold Splicing

Cold splicing involves preparing fiber ends and connecting them using a mechanical connector or flange. Key points:

  • Quick and simple: Useful for emergency repairs.
  • Higher loss: Physical connections result in more signal attenuation.
  • Shorter lifespan: Matching liquids used in some cold splices degrade over 1.5–3 years, increasing maintenance . Cold splicing is generally used for temporary or emergency connections rather than permanent installations.
Best Practices for Drop Cable Splicing
  • Use a splice tray: Protects the splice at the ONT or distribution point.
  • Maintain minimum bend radius: Avoids fiber breakage and signal loss.
  • Handle fibers carefully: Cut fibers are sharp and can cause injury; wear gloves and eye protection .
  • Plan for slack loops: Provides flexibility for future maintenance or rearrangement.
  • Ensure compatibility: Use components (cable, clamps, closures, connectors) that match in size and tolerance to prevent field failures .
When to Use Splicing
  • Permanent connections: Fusion splicing is preferred for long-term reliability.
  • High-performance requirements: Splices minimize optical loss and contamination risk.
  • Greenfield or new construction: Splicing is suitable when all drop cables are installed during construction and future rearrangement is unlikely . By following these guidelines, drop cable splicing can provide a robust, low-loss connection that ensures reliable fiber optic service from the distribution point to the subscriber's premises.

Drop cable splicing of drop cable - ZITHA TECH SPECIALTY CABLES (Pty) Ltd [PDF]

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This reference is intended for preliminary specialty-cable research. Compatibility, link budgets, fire performance, installation methods, test limits and applicable standards must be verified for the specific project.

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