OM4 multimode fiber optic cables have a core diameter of 50 microns, which allows them to transmit data over distances of up to 550 meters at a speed of 40 gigabits per second (Gbps), and up to 150 meters at 100 gigabits per second (Gbps). To recap Optical Fiber can be divided into Multimode Fiber (MMF) and Single-Mode optical fiber (SMF). With a 50-micron core, they redefine networking dynamics, making significant strides in short-distance transmissions. However, despite their similar core size and compatibility, these two fiber standards differ in modal bandwidth, maximum. There are five main types of multimode fiber, standardized by ISO/IEC 11801: OM1, OM2, OM3, OM4 and OM5. 3 dB/km at the wavelength of 1550 nm.