Brochure/Catalogue

Cable material / properties
• LSZH
LSZH is the abbreviation for Low Smoke Zero Halogen. This
material is used in the wire and cable industry for cable
sheathing. It consists of a thermoplastic or duroplastic
compound. In the event of re, the LSZH cable only releases
very small quantities of toxic and corrosive gases and no
halogens. It is mainly used in ofces and the IP20 part of
the electrical cabinet. The cable is light and environmentally
friendly.
• FRNC
FRNC is the abbreviation for Flame Retardant Non
Corrosive. FRNC cables are specied, re-retardant,
special cables with low waste gas levels according to IEC
standards 60332, 60754 and VDE0472/804. The FRNC
cable contains no halogen and so only produces very little
waste gas and a low re load. One disadvantage of the
cables is that they are not resistant to oil or chemicals and
absorb a lot of water.
• PUR (polyurethane)
PUR is one of the so-called thermoplastic elastomers
and possesses properties similar to rubber. PUR
contains no halogen, is self-extinguishing and has
very good resistance to UV light, chemicals and oil.
It is suited to outdoor use and for heavily polluted,
industrial environments. Compared with PVC, PUR offers
major advantages in terms of its high tensile strength,
wear resistance and increased resistance to chemical
substances. Examples include mineral oils, alcohol-free
benzine and many solvents.
• PVC (polyvinyl chloride)
PVC is an amorphous, thermoplastic synthetic material.
It burns with a yellow, sooty ame and goes out quickly
without further external sources of ame. Given its
high chlorine content, unlike other technical synthetic
materials such as polyethylene or polypropylene, PVC is
ame-resistant. PVC is not halogen-free and releases toxic
and corrosive gases in the event of re. PVC is an easily
processed material, is cheap and has good insulating
properties.
Category 5
Signies compliance to features specied in EIA/TIA--T568-5.
With category 5 (Cat. 5) components, networks can be
set up that are suitable for all twisted-pair cable Ethernet
transmission systems up to 100 Mbps, including 10Base-T
and 100Base-TX and 1000Base-T.
The current Category 5 corresponds with the formerly
stricter Category 5e, i.e. there is no difference here
between 5 and 5e.
Category 6
A Cat. 6 twisted-pair cable is sufcient for Gigabit Ethernet,
with a 250-MHz performance. This is an extension of the
Cat. 5e cable.
Category 7
Cat. 7 cable is suitable for operating frequencies up to
600 MHz. It is made with four individually-shielded core pairs,
all within another shielding.
Collision
Collision is when two or more stations transmit at the same
time in a joint data channel – e.g. a semi-duplex Ethernet or
a shared Ethernet. This means that the data transmitted is
worthless because they overlay. By overlaying both signals,
the signal level increases to what is known as the collision
level. This aborts the transmission to both stations.
Collision domain
A collision domain is a segment of a CSMA/CD network.
In 802.3 Ethernet networks all terminal equipment is on
a physical Ethernet segment, including equipment that is
interconnected via a repeater, on the same collision domain.
In contrast to repeaters that do not affect the collision
domain, bridges and routers separate the collision domains.
CRC
CRC is an error correction method that creates checksums
based on binary numbers by calculating the sums of data
groups prior to transmission. CRC is based on the division
of polynomials. The principal is that during cyclical block
checking, the bits to be monitored are successively fed into
a feedback shift register. The length number and position
of the feedback from the register are stated according to
each procedure. The checksum procedure detects individual
errors reliably and multiple errors with a high degree of
probability.
Crossover-cable
A crossover-cable is a special patch cable where the
transmitter and receiver lines at one end have been
swapped. Crossover-cables are used to connect two pieces
of terminal equipment (computers) or two infrastructure
components (switches). Modern switches, because of their
auto-crossing function, make connecting normal patch
cables with one another possible.
Glossary
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Technical appendix
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