INTELLIGENT BRANDS // Cabling
Class E Channel
Frequency
Myths and
Misconceptions
Taken from a recent white paper, Excel
Networking separates fact from fiction
and industry spin from reality.
T
he standards
requirement
In Cenelec (EN) or ISO terms
each Class of Channel or Permanent
link is made up by Categories of
Components. The performance
requirements of those components,
whether cable, connecting hardware
or patch cords are laid out in the
general requirements of the respective
Standards, namely EN50173-1: 2011
and ISO 11801: Ed 2.2: 2010. The
following extract from EN501721:2011 lays out the frequency
requirements for each class of channel.
Examples This standard specifies the
following classes for balanced cabling:
a) Class A: specified up to 0,1 MHz;
b) Class B: specified up to 1 MHz;
c) Class C: specified up to 16 MHz;
d) Class D: specified up to 100 MHz;
e) Class E: specified up to 250 MHz;
f) Class EA: specified up to 500 MHz;
g) Class F: specified up to 600 MHz;
h) Class FA: specified up to 1 000 MHz’
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INTELLIGENTCIO
The standard then goes on to
define the performance for each
required measurement at these set
frequencies. In the case of Return Loss
the table is as follows:
Additional Frequency measurement is all
well and good in theory but in practice,
it s \