[ F]

Fatigue Resistance - resistance to metal crystallization which leads to conductress or wires breaking from flexing.

FEP - fluorinated Ethylene Propylene is a "Teflon" fluorocarbon resin and is a registerd trademark of the DuPont Compnay. This is a melt extrudable fluorocarbon resin.

Fiber - A single, separate optical transmission element characterized by core and cladding.

Fiber Dispersion - (fiber optic) pulse spreading in a fiber cause by differing transit times of various modes.

Fiber Optics - Light transmission through optical fibers for communication and signaling. A technology that transmits information as light pulses along a glass or plastic fiber. Optical fiber carries much more information than conventional copper wire and is generally not subject to interference. Most telephone company long-distance lines are optical fiber.

Field - An area through which electric and/or magnetic lines of force pass.

Filled Cable - a telephone cable construction in which the cable core is filled with a material that will prevent moisture from entering or passing through the cable.

Filler - Nonconducting components cabled with the insulated conductors or optical fibers to impart roundness, flexibility, tensile strength, or a combination of all three, to the cable.

Film - a thin plastic sheet.

Flamarrest - Belden trademark for a plenum grade chloride-based thermoplastic jacketing material with low smoke and low flame spread properties; more flexible than traditional fluorocopolymer jacket materials. Cables jacketed with Flamarrest meet the UL Standard 910, Plenum Cable Flame Test.

Flame Resistant - The ability of a material not to fuel a flame once the source of heat is removed.