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Complete Guide to Fiber Optic Color Codes

Every color, every tube, every count. TIA-598-C is the North-American standard you'll see on 99% of cables in the field — this guide covers the base 12-color sequence, how tubes and fibers combine, and common counts from 6F up to 1728F.

The TIA-598-C 12-color base sequence

TIA-598-C defines a 12-color order used for both loose-tube IDs and individual fiber IDs inside each tube. Memorize it once and you can identify any fiber in any standard-sequence cable:

  1. 1. Blue
  2. 2. Orange
  3. 3. Green
  4. 4. Brown
  5. 5. Slate
  6. 6. White
  7. 7. Red
  8. 8. Black
  9. 9. Yellow
  10. 10. Violet
  11. 11. Rose
  12. 12. Aqua

The sequence is always the same whether you're identifying tubes (for larger counts) or individual fibers inside a tube. Tube colors repeat the fiber colors in order: tube 1 is Blue, tube 2 is Orange, tube 3 is Green, etc. Past tube 12, tubes repeat with a tracer stripe to disambiguate (tube 13 = Blue with Black tracer, etc.).

How tube + fiber color combine

In a multi-tube cable, each fiber's position is read as (tube color, fiber-within-tube color). To locate any fiber number:

  1. Divide (fiber number − 1) by fibers-per-tube to get tube index.
  2. The remainder + 1 is the fiber index within the tube.
  3. Look both up in the sequence above.

Example: fiber 47 in a 144F cable (12 fibers per tube). (47 − 1) ÷ 12 = 3 remainder 10. Tube 4 = Brown. Fiber-within-tube 11 = Rose. So fiber 47 = Brown tube, Rose fiber.

Common cable counts — quick links

Deep dives into each of the five most-searched counts, with diagrams and per-tube tables:

12 fiber color codeSingle tube, TIA-598-C only24 fiber color code2 tubes × 12 fibers (or 1 × 24 with tracers)48 fiber color code4 tubes × 12 fibers — most common FTTH drop96 fiber color code8 tubes × 12 fibers144 fiber color code12 tubes × 12 fibers — classic backbone

TIA-598-D extension (for 16-fiber MPO connectors)

MPO/MTP breakouts with 16 fibers use TIA-598-D, which adds four more colors beyond the base 12. You'll see these in data-center trunks and 400G/800G breakout cables:

  1. 13. Olive
  2. 14. Magenta
  3. 15. Tan
  4. 16. Lime

International standards at a glance

Outside North America you'll encounter IEC 60304 (global IEC), DIN VDE 0888 (Germany), S12 (Japan/NEC legacy), FIN2012 (Finland), and Type E (Ericsson/Nortel legacy). Most share the first six TIA-598-C colors but diverge on positions 7–12 — which is where splice errors happen when crews cross standards.

Related guides

Fiber splice color codeApplying TIA-598 during fusion splicingFiber optic splice closureEquipment types + best practices