12-Color Fiber Code Chart
The standard 12-position color sequence used to identify individual fibers and, in most constructions, buffer tubes or ribbons. Tap a color for its position and field identification notes.
The 12-Color Sequence
Blue
- Field identification
- Deep, saturated blue jacket or buffer.
- How it's used
- First fiber in a group. Also the first buffer tube in most tube-color sequences.
- 01Blue
- 02Orange
- 03Green
- 04Brown
- 05Slate
- 06White
- 07Red
- 08Black
- 09Yellow
- 10Violet
- 11Rose
- 12Aqua
- · The sequence repeats every 12 fibers in most constructions.
- · Tube or ribbon color usually follows the same 12-color order.
- · Some cables use tracer stripes or dashes to extend beyond 12 groups.
Color order is a convention, not a guarantee. Color alone does not establish fiber count, tube arrangement, or cable construction in every manufacturer system — always verify the specific build against the applicable cable documentation, cut sheet, or carrier record.
Call colors under neutral white light with the gel wiped off. Brown/red, blue/aqua, and white/yellow are the pairs most often misread in a dark vault or a bucket at dusk.
Jacket color and fiber color are different things. A yellow or aqua outer jacket describes the cable type, not the fiber position inside it.
Use this when identifying a specific fiber inside a tube or ribbon, checking a splice against a work order, or confirming a count sequence before you cut. For the interactive tube-and-position walkthrough, use Matrix Pro.