The cable identifier: An alphanumeric code that differentiates this cable from other cables within your facility. Make sure you use a consistent format, such as "FB-03-A142" where FB indicates fiber, 03 is either the zone or floor while A142 represents the exact cable number. 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. 5 microns that enables multiple light modes to be propagated. This Applications Note addresses Corning Optical Communications' identification scheme for optical fiber cables. In loose tube cables, this color code is used for tubes, fibers within the tubes, and subgroups (from TIA/EIA 598-A).