200-301: Cisco Certified Network AssociateDemo

OM3 and OM4 are both multimode fiber standards built around a 50/125 µm construction, so they share the same 50 micron core diameter. Their differences are in performance characteristics such as bandwidth and reach, not the core size. Official vendor documentation and industry references describe OM3 and OM4 as 50 µm-core multimode fiber.