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30 Posts in this encyclopedia category

FAR

Federal Air Regulation. USA (All information without guarantee)

Farad

Unit of measurement for electrical capacity. (All data without guarantee)

Fast Ethernet

Fast data network specified in IEEE 802.3 in 1995. Important parameters: Transmission rate 100 Mbit/s, variable packet length 64 to 1522 bytes (with 4-byte tag field optional). (All data without guarantee)

FCFC

Abbreviation for Flat Core Flat Cable. See Flat cables (All information without guarantee)

FDDI

Fibre Distributed Data interface. Is a standard for data networks that covers layers 1 and 2 of the ISO/OSl reference model. FDD is originally based on a double ring topology that uses fibre optic cables as the transmission medium. (All information without guarantee)

FEP

Perfluoroethylene propylene is an insulating material with exceptionally good electrical, thermal, chemical and mechanical properties. Continuous temperatures of up to 205°C and operating temperatures of up to minus 90°C are possible. (All data without guarantee)

Ferrule

High-precision round guide cylinder in which the glass fibre is inserted and fixed. (All data without guarantee)

Ferrule

Crimp sleeve to protect the single core cables in flexible wires.

Fibre optic cable

In contrast to electrical transmission technology, where twisted pair cables, for example, are used for data transmission, optical transmission technology uses glass or plastic as the transmission medium. Optical fibres are available as multimode and single-mode fibres (monomode fibres). (All information without guarantee)

Fieldbus

The fieldbus is a highly intelligent system of cables for connecting field devices such as sensors. (All information without guarantee)

Filler

Non-conductive element made of insulating material (PVC) or textile that is used to fill gaps in the stranding. Also known as a dummy core. (All information without guarantee)

Filler

Used as a component of insulating and sheathing compounds. The fillers used in rubber compounds, for example, directly interfere with the rubber molecules and give them good abrasion resistance. Fillers are mainly silica chalk, carbon black and aluminium oxide. (All information without guarantee)

Filling element

Filler elements are inserted into wires or cables and stranded together to close so-called open points in the bracing. They are usually made of inferior materials such as rayon, cotton, polythene cords etc., but generally have the same dimensions as the real stranding elements. (All information without guarantee)

Filter

A switch filters the data traffic based on the source and destination addresses in a data packet. An incoming data packet is only forwarded by the switch to the port to which the end device with the corresponding destination address is connected. (All information without guarantee)

FIMIKO

Elektriska Inspektoratet. Finland. Certification body (All information without guarantee)

Fire behaviour or fire properties

Testing according to VDE 0472 T 804 The standard describes the behaviour of cables and wires when exposed to flames. (All data without guarantee)

Fire load

Fire load is the energy released when cables, wires and other building materials burn. (All data without guarantee)

Fitting

Arrangement of contacts within a connector. (All information without guarantee)

Flame resistance

Certain materials used for insulation and coats only catch fire with a delay when exposed to heat. They extinguish themselves when the heat source is removed. (All information without guarantee)

Flame retardant

Thermoplastic and elastomer compounds for insulation and jackets are influenced by appropriate additives so that they only catch fire with a delay when exposed to heat. (All information without guarantee)

Flame retardant

A material made of thermoplastic PVC that extinguishes itself after exposure to flame. (All data without guarantee)

Flat cable

Multiple, parallel, individually insulated conductors with a sheath for mechanical protection. The sheath is shaped to produce a rectangular cable cross-section. Used in crane systems, for example.

Flat cables

Flat cables in neoprene or PVC design are used as trailing cables for crane systems, storage and retrieval machines and floor conveyors. They have extremely small bending radii, require little space, are highly flexible and can be packaged.

Flat gasket

In most cases, flat seals are static seals. They are used frequently and for a wide variety of applications. One common application is installation between two flanges. The seal is often inserted into a groove in the flange. In order to achieve a high sealing force, flat gaskets can also be used with modified cross-sections (e.g. diamond-shaped). This allows a higher pressure to be generated locally while maintaining the same pressing pressure and prevents the diffusion of operating fluids.

Flexibility

A cable is flexible if it can be moved back and forth without impairing its functionality (e.g. lift cables or robot cables). (All information without guarantee)

Fluoroethylene propylene (FEP)

Product from the TEFLON® range. A plastic for high temperatures, very good chemical resistance, very good electrical properties but not inexpensive. (All data without guarantee)

Foil screen

Foil shields are used in the high-frequency area of wires and cable production. These shields consist of metal-laminated plastic foils, plastic-laminated metal foils or pure metal foils. The films are either wrapped around the element to be shielded or laid lengthwise around the element in the direction of travel and possibly welded or glued. (All information without guarantee)

Frame

Data packet consisting of header, data and checksum. With Ethernet, a frame comprises 64 bytes to 1518 bytes (1522 bytes with VLAN tag). (All data without guarantee)

Frequency

Number of polarity changes in alternating current per second; unit of measurement in Hertz (Hz). (All data without guarantee)

FTZ

Central Telecommunications Office. Germany (All data without guarantee)