Typically, OM3 fiber is used for 10G Ethernet and can make connections up to 220 meters long. For prevailing 10 Gigabit transmission speeds, OM3 is generally suitable for. Multimode fiber (MMF) is a kind of optical fiber mostly used in communication over short distances, for example, inside a building or for the campus. Multimode fiber optic cable has a larger core, typically 50 or 62. Because of this, more. This guide explains the five generations of multimode fiber - OM1, OM2, OM3, OM4, and OM5 - covering their physical characteristics, color coding, bandwidth, maximum distances at different data rates, optical sources (LED, VCSEL, SWDM), and real-world applications in enterprise networks and data. This guide covers the actual distance limits for OM3 and OM4 multimode fiber at every common data rate, what determines those limits, and when to stop fighting multimode and switch to single mode. 5/125µm and 50/125µm, which are much larger than the 9/125µm core of.