Outer ring color of 144-core optical cable

In a 144-core optical fiber cable, the outer jacket color typically indicates the fiber type, while the outer tube (or “ring”) color follows a repeating 12-color sequence for tube identification.Outer Jacket ColorThe outer jacket of a 144-core cable is used to indicate the fiber mode:Yellow: Single-mode fiber (OS1/OS2), designed for long-distance, high-speed transmission using laser sources.Aqua: OM3 or OM4 multimode fiber, optimized for laser transmission.Other colors: Custom or hybrid cables may use different jacket colors if clearly labeled .Outer Tube (Ring) ColorHigh-count cables like 144-core use a “tube and fiber” system:Fibers are grouped into buffer tubes, each containing up to 12 fibers.Each tube is assigned a color from a 12-color sequence (Blue, Orange, Green, Brown, Slate, White, Red, Black, Yellow, Violet, Rose, Aqua).For 144 fibers, the 12-color sequence is cycled across 12 tubes, so the outer tube (or “ring”) color identifies the tube group, not the individual fiber . For example, in a 144-core cable:Tube 1: BlueTube 2: OrangeTube 3: GreenTube 4: BrownTube 5: SlateTube 6: WhiteTube 7: RedTube 8: BlackTube 9: YellowTube 10: VioletTube 11: RoseTube 12: Aqua Each fiber inside the tube then follows the same 12-color sequence for individual fiber identification .SummaryOuter jacket color: Indicates fiber type (single-mode or multimode).Outer tube/ring color: Identifies the tube group within the 144-core cable using the 12-color sequence.Individual fibers: Color-coded within each tube using the same 12-color sequence for easy identification during splicing or termination . This system ensures that technicians can quickly identify both the fiber type and the specific fiber within a high-count cable, reducing errors during installation and maintenance.