OM3 and OM4 multimode fiber are two common types of fiber used in local area networks–typically in backbone cabling between telecommunications rooms and in the data center between main networking and storage area network (SAN) switches. Both of these fiber types are considered laser-optimized 50/125 multimode fiber, meaning they both have a 50 micron (µm) diameter core and a 125 µm diameter cladding, which is a special coating that prevents light from escaping the core. Both fiber types use the same connectors, the same termination and the same transceivers–vertical-cavity surface emitting lasers (VCSELs) that emit infrared light at 850 nanometers (nm). So, what’s the difference?
Sourced through Scoop.it from: www.flukenetworks.com