Color sequence diagram of 12-core optical cable

The standard 12-core fiber color sequence follows TIA/EIA-598-C: Blue, Orange, Green, Brown, Slate, White, Red, Black, Yellow, Violet, Rose, Aqua. Standard 12-Fiber Color TableFiber NumberColor1Blue2Orange3Green4Brown5Slate (Gray)6White7Red8Black9Yellow10Violet11Rose12AquaThis sequence is universally applied for single-fiber pigtails, patch cords, and 12-core cables, and it repeats for higher-count cables (e.g., 24, 48, 72 fibers) using either color-coded buffer tubes or ribbon groups to distinguish sets of 12 fibers. Application in High-Fiber-Count CablesLoose-Tube Cables: Each tube contains 12 fibers following the standard sequence.

Tubes themselves are color-coded (e.g., Blue, Orange, Green, Brown, etc.) to identify groups. If fiber counts exceed 12 tubes, stripes or binder marks are added to distinguish repeated sequences. Ribbon Cables: Each 12-fiber ribbon follows the same color order.

Multiple ribbons in a cable repeat the sequence for each ribbon layer, simplifying identification in high-density cables.

Tight-

Buffered Cables: Indoor cables with 12 or fewer fibers use the same 12-color sequence. For more than 12 fibers, the sequence repeats.

Jacket Color Coding for Fiber Types

In addition to individual fiber colors, the outer jacket often indicates fiber type: Yellow: Single-mode fiber (OS1, OS2)Orange: Multimode fiber (OM1, OM2)Aqua: Laser-optimized multimode fiber (OM3, OM4, OM5) This helps technicians quickly identify fiber type without opening the cable.

Summary

The 12-color sequence (Blue, Orange, Green, Brown, Slate, White, Red, Black, Yellow, Violet, Rose, Aqua) is the industry standard for fiber identification. It is applied consistently across single-fiber, ribbon, and loose-tube cables, and repeats in higher-count cables with additional tube or ribbon markings to maintain clarity and prevent errors during installation or maintenance.