Fiber optic cable core removal by opening a window

Fiber optic cable core removal by opening a window involves carefully stripping the outer jacket and selectively exposing only the fibers needed for splicing, while leaving the rest of the cable intact.

Overview

Opening a window in a fiber optic cable allows technicians to access specific fibers for splicing or drop connections without cutting the entire cable. This is commonly used in midspan access or when connecting a drop cable to a backbone network . The process preserves the remaining fibers and maintains the cable's mechanical and optical integrity.

Tools and Materials

• Sheath knife or cable slitter for outer jacket removal
• Needle-nose pliers for ripcord handling
• Scissors for cutting binder and tape wraps
• Midspan access tube tools (e.g., Miller tools) for shaving buffer tubes
• Splice trays or closures for fiber storage

Step-by-Step Procedure

1. Mark and Cut the Outer Sheath: Measure the desired length of cable to access (typically 2 meters for end access or shorter for midspan). Use a sheath knife to “ring” the outer jacket carefully, avoiding damage to ripcords or strength members .
2. Remove the Sheath: Flex the cable at the ring cut to separate the jacket and slide it off. Expose the ripcords and cable core .
3. Use Ripcords: Wrap the ripcord around pliers and pull to split the sheath along the cable length. Remove the split sheath to reveal the core .
4. Prepare the Core: Cut and remove unnecessary binder tapes, water-blocking yarns, and strength members, leaving the buffer tubes intact .
5. Open the Buffer Tube (“Window”): Identify the buffer tube containing the fibers to be spliced. Use a midspan access tool to shave a section of the tube, exposing only the fibers needed for the drop cable .
6. Splice and Secure: Place the exposed fibers in a splice tray, carefully coil the untouched buffer tubes, and secure them in the closure. Only the fibers being dropped are cut and spliced .

Safety and Best Practices

• Avoid nicking or bending fibers excessively to prevent signal loss .
• Maintain proper slack and secure fibers in splice trays to prevent stress .
• Follow manufacturer and company-specific procedures for armored or dielectric cables .
• Use approved tools and ensure they are in good working order . By following these steps, technicians can safely remove a fiber optic cable core through a window, enabling precise splicing while preserving the rest of the cable for future use.