INTELLIGENT BRANDS // Cabling
AS WELL AS NOT CONFORMING
TO NATIONAL AND
INTERNATIONAL STANDARDS,
CABLES THAT CONTAIN CCA
WILL ALSO FALL SHORT ON
ELECTRICAL AND INSTALLATION
PERFORMANCE
cords. CCA conductors are not permitted in any
of these standards.
Any manufacturer using CCA and claiming
conformance to these standards, or claims to
have third party verification for their cables
is making false statements and should be
avoided.
Performance
As well as not conforming to national and
international standards, cables that contain
CCA will also fall short on electrical and
installation performance. It is commonly
believed that CCA conductors have high
frequency and electrical properties that are
the same as solid copper conductors. As
CCA has the copper layer on the outer of the
conductor, this means the performance at the
higher frequencies may be similar but at lower
frequencies and for DC current parameters the
performance is degraded.
At a glance…
Nexans launches
solutions for 25g and 40g
Ethernet at CeBIT 2016
Has annpounced its
new copper-based
solutions to support
bandwidths of
25Gb/s and 40Gb/s
Ethernet.
Nexans’ LANmark7A is now upgraded
in frequency from
1000MHz to 1250MHz to fully cope with the demands
of 25GBase-T. Designed for applications beyond 10G,
LANmark-7A supports existing RJ45 based legacy
equipment using the backwards-compatibility of GG45
connectivity. This technology allows for a seamless
migration to 25G over 30m while being fully compatible
with 10GBaseT over distances greater than 100m.
Category 7A is currently the highest performing standard
available and is specified to 1000MHz. Although 25GBase-T
will use 1000MHz as upper frequency some headroom is
required from the cabling. LANmark-7A has always delivered
headroom beyond the minimum and this change formalises
that for new installations. Existing installations of LANmark7A may also be qualified to support 25GBase-T.
Comparative ISO11801 Class D permanent link
performance of CCA v solid copper conductors.
Aluminium has a much higher resistance
than copper. This will mean cables using CCA
conductors will fail permanent link testing,
especially for lengths over about 80m.
LANmark-8, which will also be launched, is based on
LANmark-7A, with enhancements including the ability to
support frequencies up to 2000MHz, enabling transmission
of 40GBase-T over 30m. Both systems are based on
Nexans’ GG45 connector, which is a screened RJ45
compatible cable jack specified up to 2000MHz.
CCA also has a higher attenuation than copper,
which will have a noticeable effect on longer
channel lengths and it will lead to network
problems for users
These developments were designed specifically to address
the challenges of supporting high frequency Ethernet
applications in excess of 10 Gigabits.
(For the full white paper, please visit:
https://www.brand-rex.co.uk/sites/default/
files/Documents/brand-rex_copper_clad_
aluminium_cca_in_network_cabling.pdf
56
INTELLIGENTCIO
Combined with LANmark-7A cable and patch cords, GG45
offers support for 25GBase-T.
Combined with a LANmark-8 2GHz cable, GG45 offers
support for 40GBase-T.
www.intelligentcio.com