M-Core Cables : Revolutionizing Connectivity
2024-04-27
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Fiber Optic Color Codes Explained: Fibers, Tubes and Jackets
Understand fiber optic color codes: the 12-color fiber sequence, loose tube colors, and jacket colors for single-mode and multimode cables.
When a technician opens a fiber cable for splicing, color is how every fiber is identified. Getting the sequence wrong means connecting the wrong customer or link. Most of the industry follows a standard 12-color sequence, based on the TIA-598 standard, though some manufacturers and operators use their own variations. Always confirm the scheme used in the cable you are working on.
The standard 12-fiber color sequence
| Fiber number | Color |
|---|---|
| 1 | Blue |
| 2 | Orange |
| 3 | Green |
| 4 | Brown |
| 5 | Slate (grey) |
| 6 | White |
| 7 | Red |
| 8 | Black |
| 9 | Yellow |
| 10 | Violet |
| 11 | Rose (pink) |
| 12 | Aqua |
Fibers above 12
For cables with more than 12 fibers, the same color sequence repeats. The groups are separated either by placing each group in a separately colored loose tube, or by adding a stripe or dash marking to the repeated colors. In multi-tube cables, the tubes themselves usually follow the same blue, orange, green order.
Jacket colors
Patch cords and indoor cables often use jacket colors to show fiber type. Yellow commonly indicates single-mode, orange is used for older multimode (OM1, OM2), and aqua for laser-optimised multimode (OM3, OM4). Outdoor cables, such as HDPE-sheathed loose tube cables, are usually black for UV protection, sometimes with a colored stripe for identification.
Why color codes matter
- Faster, more accurate splicing and termination
- Fewer connection mistakes during installation and repairs
- Clear documentation of which fiber serves which link
Tips for technicians
- Check the manufacturer's color scheme before splicing
- Record fiber colors and tube numbers in your splice records
- Work in good light, as some colors such as aqua and blue or rose and red can look similar
Frequently asked questions
What is the first fiber color?
In the standard sequence, fiber 1 is blue, followed by orange, green and brown.
Why are outdoor fiber cables black?
Black HDPE sheaths resist sunlight and UV damage better, which is important for outdoor and aerial routes.
Do all manufacturers use the same color code?
Most follow the standard 12-color sequence, but some use variations. Always check the cable's documentation before splicing.
M-Core manufactures optical fiber cables from 2F to 24F for FTTH, ISP and enterprise networks.
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Frequently Asked Questions
What products does M Core manufacture?
M Core manufactures Optical Fiber Cables (OFC), CCTV cables, networking cables, and FRP rods for domestic and international markets.
Does M Core export cables internationally?
Yes, M Core exports its wire and cable products to more than 27 countries worldwide, serving distributors and businesses globally.
Where is the M Core manufacturing facility located?
M Core's manufacturing facility is located in Kundli, Sonipat, Haryana, India.
How can I request a product catalog or quote?
You can download our product catalogs directly from the e-catalogs page, or contact us through the contact page for a customised quote.
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