Televes Coaxdata 1Gbps-HDTV COAX+PLC 1ETH+1SFP - Manual (Page 24)

CoaxData 1Gbps-HDTV Ref.769201/Ref.769202
24
Professional and Special Applications
There are installations that require engineering support for the design and installation. Large distributions
MATV / SMATV, CATVs small / medium, HFC (hybrid fiber / coaxial) unique Installations such as hotels,
residences, schools, hospitals, cruise, security technology. For the creation of these systems
professionals need to consider a set of common characteristics to ensure the quality of the installation.
• Line Amplifiers
Its function is reamplified TV signal and
have different characteristics that must be
taken
into account.
The transmission system, which is based
CoaxData technology, works in the
frequency range 2-30 MHz / 2 to 67,5 MHz,
depending on the version, and as a
bidirectional system generates signals from
both of the slaves connected to the sockets
as from master at the head.
This implies that in line amplifiers return
channel should be passive in order to
ensure
its bidirectionality.
It will present an outline of installation where
two modems are used (ref. 769 201) in a
configuration called "repeater" allowing
regenerate the data signal and increase the
range of the network.
• Large number of users and outlets
The existence of a large number of
outlets produces an increase of
interfering noise in the return channel.
This is significant noise in the head
because the confluence of the noise
contributions of the entire system
• Devices on headend
CATV networks are characterized by the existence of the
header elements with high levels of signal, such as channel
processors, modulators, etc. These items, if not filtered, can
add noise in the return path of the network, generating a
degradation in the quality of the links.
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