High-performance,
low-cost passive copper cabling
remains the preferred
alternative for short-reach applications in the data
center. However, standard
round copper cables can be bulky and consume precious
space. A recent innovation in
manufacturing technology by 3M has resulted in the
development of
a
uniquely shielded, thin, ribbon-style copper cable. The cable has the ability to
fold multiple times and maintain signal integrity, allowing for higher-density
racks and space savings. A major barrier to decreasing the size and
stiffness of a round cable is inherent in the construction of traditional cable.
This is an issue because a round copper cable can extend up to nine inches when
routed behind a cabinet. In conventional, twin axial constructions, the shield
is applied by wrapping it spirally around the insulated wire pair. This layer is
then overwrapped to provide support and retain the primary shield wrap,
increasing the stiffness of the pair. Multiple pairs are then cabled and an
overall foil and braided shield are typically applied, thus further increasing
the cable bulk and stiffness.