<body>
<p>Global networking continues to grow at an
unstoppable pace and constantly demands
higher performance, innovative and technically
ingenious networks and intelligent rack
system platforms. These platforms represent
the nodal points of these networks and
create the interfaces between Internet, LAN
and WAN. </p>
<p>A well structured cable management also
plays a pivotal financial role in this networking,
especially in the rack systems of the networks,
servers and telecommunication.
Data cables are high grade components in a
cabling system and are an integral component
in the overall system. Only when these »cables« are treated and laid properly, can
their technical properties be used to their
full potential. </p>
<p>Data cables can be made of copper or fibre
optics. Traditional copper cables usually
have a small external diameter and consist of
a “loose” structure of four wire pairs stranded
with one another with small copper crosssections.
And it’s for this very reason that it is
extremely important to reduce the mechanical
stresses of these cables to the absolute
required minimum. Fibre optic cables on the
other hand consist of an inner conductor
made of glass or plastic (core), a glass or
plastic coat (cladding) and several more
coats that provide protection against
mechanical stresses. These millimetre
thick fibre glass cables are far more sensitive
to mechanical strain. </p>
<p>So if we’re talking about cable management,
then we also have to talk about feeding electrical
energy, that is, the power cables must
be protected from mechanical strains and
stresses. Power cables in networks are usually
laid separate from the data cables. </p>
<p>Multifunctionality: A closer look at
the individual products reveals that
some possess an inherent “multitalent”.
The cable routing brace, for example,
not only has the option of
routing cables horizontally and vertically
using Velcro ties or cable ties,
but rather also allows numerous
components to be mounted using
screws and caged nuts. These caged
nuts can also be shifted with room for
play in a slot, so that every mounting
dimension can be accommodated.
The new Knürr cable management
system guarantees a material-protecting
cabling system for all communication
requirements (voice, data and
video), while also taking future transmission
technologies into account.
Special consideration during the
development was given to ... </p>
<p>Ease of installation: In the complete
product range, it is always ensured
that the individual cable management
components are easy to install.
The convenient “one-man-installation”
is therefore just as important as
the “later-stage” installation of components. </p>
<p>Application options: The individual
cable management components
have been designed for flexible use in
numerous applications (e.g. radial
limit in conjunction with the C-extrusion
rail with the cable entry and for
the cable rerouting in the rack). </p>
<p>Transparency: Different components
for fibre glass and copper cables,
especially the fixing options using
Velcro strips and cable bundling
with different coloured Velcro strip
cable ties, guarantee a transparent
cable management, which is the optimum
starting situation for an intelligent
expansion of the network and
for the highest standard of servicing
convenience. </p>
<p>Safety: During selection of the production
technology, the materials
and the surfaces, constant attention
was paid in ensuring that these products
would not cause any damage to
the cables. </p>
<p>Flexibility: The components demonstrate
a particularly high degree of flexibility
with relocations or with expansions
of the communications structure.
Costs: In addition to cost-effective
production, particularly close attention
was also paid to a costs-conscious
application. </p>
<p>Investment security: Knürr cable management corresponds
in the objectives it sets out to achieve with the
requirements of future transmission technologies, and
it therefore promises high investment security in the cabling
of networks in Knürr rack systems. </p>
<p>It must be ensured when laying cables
that every type of mechanical stress
is avoided: </p>
<p>• Bending loads
The bending radii may never be less
than the values provided by the cable
manufacturer in the respective data
sheets. At points that bend too much,
the electrical properties of the »cable«
change and reduce the transmission
bandwidths and ranges. If no manufacturer
specifications are available,
then the following rule of thumb
applies: With loose cabling, at least
15 times the external cable diameter
and with fixed cabling, at least 10 times
the external cable diameter.</p>
<p> • Kink stress
The most extreme bending loads
can cause the cable to break.
• Tensile stress
This is only determined by the copper
cross-section of the conductor, as all
other materials are too soft. The
»cable« may not be stressed more
than 50N/(mm2 Cu cross-section) as
otherwise the conductors are stretched
and the cross-section is reduced. If
higher pulling forces are unavoidably
required, then »cables« with
additional strain relief elements
must be used.</p>
<p>• Compressive stress
These are caused by loads bearing
down from above, fixed clamping or
sharp kinking of the »cable« and must
always be avoided, as otherwise the
“loose” cable structure changes and
the electrical transmission properties
are impaired.</p>
<p>• Torque stresses (twisting)
These must never have an effect on the
»cable«, as they drive the cable elements
into one another and therefore
impair the transmission properties.
Velcro cable tie With all cable management
components, special attention
has been paid in ensuring that
mounting can be made using Velcro
strip cable ties. Velcro cable ties not
only guarantee a stress-free fixing of
the cable, but rather can also be released
at any time and reused again
and again.</p>
<p> Velcro cable ties are also
extremely helpful for the installation
engineer both in providing a pinchfree
cable bundling and because they
are so quick to apply. </p>
<p>Excess cable storage The storage of
excess cable lengths is made on the
one hand separated from the patch
fields, however in a position that is always
easily accessible. Copper cable
excess can be stored separate from
fibre glass excess lengths within the
Knürr rack systems: the copper cables
stored hanging on a side and the
more sensitive fibre glass cables
stored flat in a front-accessible excess
length drawer. </p>
<p>Cable clamping and strain relief
Both an easy to access cable clamping
and a technically fault-free
strain relief are also guaranteed
with the Knürr range of products. </p>
</body>