ÖLFLEX
®
ACCESSORIES
FLEXIMARK
®
SILVYN
®
SKINTOP
®
EPIC
®
HITRONIC
®
ETHERLINE
®
UNITRONIC
®
APPENDIX
For current information see: 1200
Appendix
Glossary
Digital signal transmission
Transmission of a signal using binary light pulses in a period time pat-
tern.
Dimension
A term for the geometric size of a wire or strand, expressed as a diam-
eter or cross-section. Often used in conjunction with the number of
cores, e. g. 18 x 1.5 mm2.
DIN
Abbreviation for Deutsches Institute für Normung [German Standardi-
sation Institution]. It is based in Berlin, Germany.
DIN EN
European standard added to the German body of standards.
Direct line, connecting cable
A connecting cable is a cable that has a coupling connector through
which the network connection is established. The fixed connection
is found inside the device. The device is portable. The coupling connec-
tor contains earthed contacts and is thermoplastically moulded to the
cable. Connecting cables are, for example, used to connect portable
telephones.
Dispersion
Dispersion of the signal running time in a light waveguide. It is made
up of various components: mode dispersion, material dispersion and
waveguide dispersion. As a result of its dispersion, a light waveguide
acts as a low-pass filter for the signals to be transmitted (see → Trans-
mission function).
DKE
Abbreviation for Deutsche Kommission Elektrotechnik und Elektronik
Informationstechnik [German Electrical Engineering, Electronics and
Information Technology] in DIN und VDE. It is a branch of the DIN and
its agency the VDE (Electrical Engineering, Electronics and Information
Technology Federation). As a national organisation for formulating
standards in electrical engineering and information technology, the
DKE deals with important interdisciplinary issues such as safety, EMC,
components and performance of conventional electric circuits, mobile
wireless communication, software and Internet protocols. DKE is the
German member of the European and global standardisation organisa-
tions. The DKE implements and publishes the results of standardisation
work by the → IEC, → CELENEC and → ETSI in national standards.
Drag chain cables
Drag chain cables are cables used in power chains (e. g. ÖLFLEX® FD,
ÖLFLEX® SERVO FD, UNITRONIC® FD plus at Lapp).
Drain wire
Single- or multi-wire non-insulated conductor that is run in close metal-
lic contact under a screening.
Ductility, flexibility
As all cables and cores are liable to mechanical stress, they are also
checked for flexibility, i. e. bent several times around various bending
radii. There may be no visible damage to the cables, sheaths, inner or
outer protective covers after testing. All stranded elements, braidings
and wrappings must also remain correctly in place. In addition to the
diameter of the strand assembly and the number of elements to be
stranded, the length of lay plays a significant role in the flexibility of
a cable. Based on the following principle: The shorter the length of lay,
the more flexible the strand assembly.
Dummy
If there are “openings” detected in the cable, dummy elements or
dummy cores are inserted and stranded together with the cable
assembly. Dummy elements are generally made from cheap, inferior
materials such as polyethylene twine, spun rayon and cotton. They are
usually the same size as the real stranding elements.
Duplex operation
Transmission of two independent signals over a particular distance.
Duroplastic
In contrast to thermoplastics, after heating duroplastics cannot be
deformed by heating them again. Duroplastics are required in the cable
industry, e. g. as cable fittings or connectors.
E
Earth connection
Earthing of a point of the circuit, such as the neutral point, neutral
conductor, midpoint or outer conductor.
Earth electrocode, ground system
Conductor that provides a conductive connection to earth. For exam-
ple, it can be embedded in the ground or have a large area in contact
with the ground.
Earthing
Earthing guarantees a clear reference potential for screening the active
and passive components of a network.
ECAD
The ECAD component standard is a manufacturer-independent stand-
ard for describing item and engineering data in electrical engineering,
specifically for machine and equipment manufacture.
EIA
Abbreviation for Electronic Industries Associations.
Elastomere
Elastomers are widely used for sheathing and insulating cables
because of their excellent electrical and mechanical properties. Elasto-
mers are high-molecular materials, whose elasticity depends on the
degree of cross-linking. The biggest difference between elastic and
plastic materials lies in loading and relief. After relief, an elastic mate-
rial reverts to its original shape.
Electric circuits
In a cable, circuits with different voltages can be operated if they are
insulated for the maximum voltage that occurs – VDE 0113 Part 1 and
VDE 0100 Part 520.
Electric diameter of conductors
Determined on cables by electrical resistance measurements.
Electric Field
When voltages are applied to cables, electrical fields are formed, which
can take on different shapes depending on the cable construction. In
the low voltage range, up to approx. 1 kV, electrical fields have only
a negligible influence on the dimensions of the insulating walls. To
guarantee operational safety, there are high demands on the materials
and dimensions in the high voltage range. An electrical field is repre-
sented by field lines. The density of these field lines indicates the force
that exists between the two points on a field line (voltage).