The OM3 notation indicates that this cable is multimode grade OM3. On other cables, you might see codes like this incorporating -OM2, -OM4, or -OS2, which also correspond to the grade of optical glass. They have many things in common such as the fiber connectors and application scenarios, making them confusing to users. In the two tables above, we've summarized the main differences between OM1, OM2, OM3, OM4, and OM5. These differences include the maximum distance and speed. OM1 is not compatible with connectors for OM2/OM3/OM4) However: Per TIA 598-C, it is permissible to use different jacket colors as long as the cable is identified in the print legend. Please check the print legend or contact the manufacturer before trying to make a positive ID! Even if you have. Fiber optic cables are crucial for high-speed data transmission, and identifying them correctly is essential for maintenance, troubleshooting, and system upgrades. Check the Jacket Color Fiber optic cables often. Watch the video to learn how to quickly identify OM1, OM3, OM4, OM5, and singlemode fiber by jacket color and understand what each color represents before selecting your next Pre-Terminated Fiber Optic Assembly. Q1: What do OM1, OM3, OM4, OM5, and singlemode fiber colors mean? Orange typically. How Many Types of Multimode Fiber? Identified by ISO 11801 standard, multimode fiber optic cables can be classified into OM1 fiber, OM2 fiber, OM3 fiber, OM4 fiber and newly released OM5 fiber.