Fiber Optic Cable Coloring

Fiber optic cables follow the TIA‑598 12‑color sequence—blue, orange, green, brown, slate, white, red, black, yellow, violet, rose, aqua—and jacket colors typically indicate fiber type (e.g., yellow = OS1/OS2 single‑mode, orange = OM1/OM2, aqua = OM3/OM4, lime green = OM5).1. Standard 12‑Fiber Color Sequence

Used for identifying individual fibers and buffer tubes:

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

Repeating Beyond 12 Fibers

• For fiber counts above 12, the sequence repeats.
• Repeated groups use tracer stripes (one stripe for fibers 13–24, two stripes for 25–36, etc.).

2. Jacket Color Codes (Indoor Premises Cable)

Jacket colors indicate fiber type (EIA/TIA‑598‑D):

Fiber TypeJacket ColorTypical UseOS1/OS2 Single‑modeYellowLong‑haul, backboneOM1 MultimodeOrangeLegacy LAN (62.5 µm)OM2 MultimodeOrangeShort‑distance gigabit (50 µm)OM3 MultimodeAqua10G/40G data centersOM4 MultimodeAqua or VioletEnhanced high‑speedOM5 MultimodeLime GreenWideband multimode (SWDM)PM FiberBlueSpecialized sensing/lab

Outdoor Cable Exception

• Outdoor fiber jackets are almost always black for UV resistance, regardless of fiber type.

3. Connector Color Codes

Connector colors help identify polish type and mode:

• Blue = Single‑mode UPC
• Green = Single‑mode APC
• Beige = Multimode OM1/OM2
• Aqua = OM3/OM4
• Lime Green = OM5

4. Practical Notes

• “Slate” = gray; “rose” = pink.
• Aqua can appear pale and be confused with blue under certain lighting.
• Always confirm fiber type from printed cable legend—colors identify, but do not guarantee type.

Fiber optic color coding ensures accurate identification of fiber type, strand position, and connector compatibility across installations.