Fiber Optic Cable
Fiber optic cable carries light pulses along its fibers rather than electrical signals. This cable is made of glass or plastic fibers, rather than copper wire like most other network cabling.
The core of the cable is usually pure glass. Surrounding the glass is a layer of cladding made of glass or plastic. It traps the light in the core.
The cladding is surrounded usually by Kevlar, which is the strong substance used in bulletproof vests. There is an outer protective jacket made of Teflon (plenum grade) or PVC.
The light pulses originate from a laser (single-mode cable) or light emitting diode (multimode cable). This type of cable supports data transmission rates of 100 Mbps to 2 Gbps. Fiber optic segments can span up to 100 km.