ÖLFLEX
®
ACCESSORIES
FLEXIMARK
®
SILVYN
®
SKINTOP
®
EPIC
®
HITRONIC
®
ETHERLINE
®
UNITRONIC
®
APPENDIX
For current information see:
www.lappgroup.com1205
Appendix
Glossary
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.
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.
Mode
Discrete light wave forms that can propagate in a light waveguide.
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.
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.
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.
NEMCO
Norwegian testing body, similar to the VDE in Germany.
Neoprene
®
Trade name of the company DuPont de Nemours for synthetic chloro-
prene rubber.
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