"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"

FAILSAFE. Built-in safety characteristics of a unit or system so that unit or system failure or a loss of control power will not result in an unsafe condition. The term 'Fail safe' in serial buses also refers to setting the bus lines to a quiescent state once driver stops transmitting [Idle-line failsafe]. Refer to Pull-up/Pull-Down Resistors EIA485 Interface to see an example of the calculation.

FANOUT. The number of IC gates an Integrated circuit can drive is determined by the current it can source and sink. Expanded FanOut definition

FDDI. Fiber Distributed Data Interface is a Local Area Network [LAN] using Fiber-Optic cable in a Dual Token Ring topology. FDDI is defined in ISO 9314-1/2/3.

FERRITE. A powdered and compressed ferric oxide material that has both magnetic properties and light resistance to current flow.

FIBER OPTICS. Conductors or optical wave guides that readily pass light. Fiber Optic Connector Manufacturers

FRAME RELAY. An interface protocol for statistically multiplexed packet-switched data communications in which (a) variable-sized packets (frames) are used that completely enclose the user packets they transport, and (b) transmission rates are usually between 56 kb/s and 1.544 Mb/s (the T-1 rate).