Archived 2016 Lapp Group International Catalog

Appendix Glossary

ÖLFLEX ® ACCESSORIES FLEXIMARK ® SILVYN ® SKINTOP ® EPIC ® HITRONIC ® ETHERLINE ® UNITRONIC ® APPENDIX

Loss factor The loss factor depends on frequency, temperature and capacitance. This factor is the ratio of effective power to idle power with a sinusoid voltage.

Motor cable Motor cables are supply cables for electric motors (e.g. ÖLFLEX ® SERVO FD at Lapp). Multimode fibre Light waveguide whose core diameter is large compared to the light wavelength and in which a large number of modes can therefore be propagated. A gradient profile (→ gradient fibre) allows the → mode dispersion to be kept low, allowing large transmission bandwidths to be achieved, although these can be exceeded using → monomode fibres. Mutual capacity, operating capacity For four, pair or phantom cable circuits: the capacity between the cores a and b of these cable circuits. With one core: the capacity between a conductor and all remaining interconnected conductors of a cable. N Nanosecond Billionth of a second. Time unit for the internal switching speed of computers. Near-end crosstalk, far end crosstalk In multi-pair data cables, the field effect of the signal transmission for one pair induces an interference signal in adjacent pairs. Crosstalk does not depend on the length and is greater as the frequency increases. The difference between the effective signal and the interfer- ence signal measurable at the adjacent pair is referred to as crosstalk attenuation and is specified in dB. We differentiate between: NEXT (Near End Crosstalk) and FEXT (Far End Crosstalk). NEC Abbreviation for National Electrical Code. Group of standards for the safety of electrical equipment, e.g. electrical equipment installations in the low voltage range up to 600 V – USA. NEMA Abbreviation for National Electrical Manufacturers′ Association. The NEMA works in conjunction with the IECA to produce and promote standards for cables – Washington D.C., USA.

M Machine set-up for core insulation – Extrusion

The following single units have mainly conventional extrusion lines for core and insulating covers: Overend take-off, wire straightener, wire pre-heater, capacitance bridge, extruder, embossing or marking device, cooling section, eccentricity measuring device, diameter scanner, high-voltage testing device, double roller haul-off machine, accumula- tor and double bobbin winder. Master Central bus subscriber that controls bus access. All other subscribers operate as slaves (see → ASI). Master-Slave principle The master element issues instructions and the slave elements follow them. With decentralised bus control, for example, an automation device acts as the master element and issues access rights for the other components (slave elements – see → ASI). Material dispersion With a non-monochromatic light source, the dispersion that results from the dependency of a material′s refraction index n on the wave- length and from the light velocity in that material. Mica powder Natural mineral product that is pulverised and used as a separating agent and lubricant either on its own or mixed with talcum. In the form of foils and strips, mica is also used for insulating conductors exposed to high thermal loads. Microbending Bending of fibres that have local axial deviations of a few micrometers and physical wavelengths of a few millimetres, for example. Microbend- ing causes light losses and thus increases the → attenuation of the fibres.

NEMCO Norwegian testing body, similar to the VDE in Germany.

Mode Discrete light wave forms that can propagate in a light waveguide.

Neoprene ® Trade name of the company DuPont de Nemours for synthetic chloro- prene rubber.

Mode dispersion The signal distortion in a light waveguide caused by overlapping modes with different running times. Modem Device for adapting digitally operating data stations for analogue tele- communications channels.

Network Cable network used to create connections between data stations.

Neutral conductor Neutral conductors, where used, may not have a smaller cross-section than the outer conductor, see VDE 0100 Part 520, Section 524.2. NFPA Abbreviation for National Fire Protection Association. Issuer of NFPA standards and NEC – USA. NFPA 79 NFPA 79 is the section of the National Electric Code (NEC ® ) which includes the requirements for electrical wiring of industrial machinery. NFPA 79 generally applies to electrical components used in individual

Modulation A network signal to be transmitted is modified by a carrier signal.

Monomode fibre Light waveguide with small → core diameter in which only one mode, the basic mode, can be propagated. This fibre type is particularly suit- able for broadband transmission over long distances as its → transmis- sion bandwidth is only limited by → chromatic dispersion.

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