128-core optical cable splicing sequence

Splicing a 128-core optical cable requires following the TIA-598-C color code, grouping fibers into buffer tubes, and carefully arranging them in splice trays to ensure accurate identification and minimal splice loss.

Fiber Identification and Color Coding

For high-count cables like 128-core, fibers are organized into buffer tubes, each containing up to 12 fibers. The TIA-598-C standard defines a 12-color sequence for individual fibers: 1-Blue, 2-Orange, 3-Green, 4-Brown, 5-Slate (Gray), 6-White, 7-Red, 8-Black, 9-Yellow, 10-Violet, 11-Rose, 12-Aqua. For cables exceeding 12 fibers, the sequence repeats with tube-specific markings (e.g., stripes) to maintain unique identification for each fiber . For a 128-core cable, you typically have 11 buffer tubes (11 × 12 = 132 fibers, with 4 fibers unused or reserved). Each tube is assigned a color or stripe pattern, and fibers inside follow the 12-color sequence. For example, Fiber #45 would be the 9th fiber (Yellow) in the 4th tube (Brown) following the TIA-598-C method .

Splicing Sequence Steps

1. Prepare the Cable: Strip the outer jacket and expose the buffer tubes. Ensure strength members are secured and grounded if metallic. Cut tubes to proper lengths for splice trays .
2. Identify Tubes and Fibers: Use the tube and fiber color coding to map each fiber to its splice position. Maintain a splice map to avoid miswiring .
3. Arrange Fibers in Splice Trays: Place each buffer tube in the tray, carefully untwisting fibers as needed. Avoid bending fibers beyond their minimum bend radius. Fibers may be twisted slightly to fit neatly, but excessive stress must be avoided .
4. Splice Fibers: Use fusion splicing for permanent connections or mechanical splicing if temporary. Ensure low splice loss and proper alignment according to ITU-T L.12 standards .
5. Secure and Protect Splices: Place spliced fibers in the tray, coil excess fiber neatly, and close the tray. Insert the tray into the splice closure (dome or inline type) and seal according to manufacturer instructions .
6. Label and Document: Clearly label each fiber and tube in the closure. Maintain a record of the splicing sequence for future maintenance or troubleshooting .

Practical Tips

• Always follow manufacturer instructions for buffer tube lengths and closure preparation.
• Use magnification and proper lighting to reduce errors in high-density splicing.
• Maintain strain relief for all fibers to prevent microbends or breakage.
• For very high-count cables, consider pre-terminated modules to simplify field splicing. By following this sequence, a 128-core optical cable can be spliced efficiently, with each fiber correctly identified and protected, ensuring long-term network reliability and compliance with international standards .