Multimode fiber cables are typically color-coded as orange, gray, aqua, violet, or lime green depending on the fiber type and performance level.

Standard Multimode Fiber Colors

• OM1 (62.5/125 µm): Usually orange; some legacy cables may also appear in other colors, but orange is standard for OM1 multimode fiber .
• OM2 (50/125 µm): Typically gray, though early OM2 cables may also be orange; always check printed markings to confirm .
• OM3 (50/125 µm, laser-optimized): Aqua jacket; designed for high-speed 10G Ethernet and above .
• OM4 (50/125 µm, laser-optimized): Often aqua like OM3, but some manufacturers use violet jackets to differentiate OM4 in high-density data centers .
• OM5 (50/125 µm, wideband multimode): Lime green; supports Short Wave Division Multiplexing (SWDM) for multiple channels on a single fiber pair .

Connector Color Coding

Fiber connectors also follow color conventions to match the fiber type:

• OM1: Beige or gray
• OM2: Black
• OM3: Aqua
• OM4: Violet
• OM5: Lime green These colors help technicians quickly identify fiber types and ensure proper connections, especially in complex installations .

Practical Notes

• Always verify the fiber type by reading printed markings on the cable jacket, as some older or non-standard cables may not follow the standard color scheme .
• Multimode fibers are generally used for shorter distances (up to 300 meters for OM3 and about 400 meters for OM4) and are ideal for LANs, data centers, and multimedia applications .
• Using the correct color-coded fiber ensures compatibility with connectors, transceivers, and network equipment, reducing the risk of signal loss or misconfiguration . By following these color standards, technicians can efficiently manage multimode fiber installations and maintain network performance.