Indoor optical cable sheath color

Indoor fiber optic cable jackets are color-coded to indicate fiber type: Yellow for single-mode, Orange for OM1/OM2 multimode, Aqua or Violet for OM3/OM4 multimode, and Lime Green for OM5 multimode.

Standard Jacket Colors for Indoor Fiber

Indoor optical cables follow the TIA-598-D/C color standard, which assigns specific colors to the outer jacket to quickly identify fiber type without opening the cable: Single-mode fibers (OS1/OS2): Yellow jacket, suitable for long-distance, high-speed transmission using laser sources. Multimode OM1 (62. 5/125 µm) and OM2 (50/125 µm): Orange jacket, typically used for legacy LANs or short-distance links.

Multimode OM3 (50/125 µm, laser-optimized): Aqua jacket, designed for 10–100 GbE short-range data center applications. Multimode OM4 (50/125 µm, laser-optimized): Aqua or Erika Violet jacket, offering higher bandwidth and longer reach than OM3. Multimode OM5 (50/125 µm, wideband multimode): Lime Green jacket, optimized for shortwave division multiplexing (SWDM) and high-speed multi-wavelength applications.

Inner Fiber Color Coding

Inside multi-fiber indoor cables, each fiber strand is color-coded using a 12-color sequence to facilitate identification during splicing or termination: BlueOrangeGreenBrownSlate (Gray)WhiteRedBlackYellowVioletRose (Pink)Aqua For cables with more than 12 fibers, the sequence repeats with additional markers such as stripes or rings to differentiate groups.

Connector and Boot Colors

Connectors also follow color conventions to indicate fiber type and polish: Single-mode UPC: BlueSingle-mode APC: GreenOM1/OM2 multimode: Beige or BlackOM3/OM4 multimode: Aqua or VioletOM5 multimode: Lime Green These colors help prevent misconnection and ensure proper network performance.

Practical Notes

Indoor cables may also have LSZH or PVC jackets for fire safety and low smoke emission in enclosed spaces. Hybrid or multi-fiber cables may include printed legends on the jacket to indicate fiber types when multiple types are present. Always verify the printed markings on the cable, as some manufacturers may use slight variations in color tones or custom colors with proper labeling.

By following these color standards, technicians can quickly identify fiber types, reduce installation errors, and maintain high-performance indoor optical networks.