In Broadcast - October 2020 - 17

17

www.inbroadcast.com | Vol: 10 - Issue 10 | October 2020

InSAT

Satellite Antenna Diversity
DEV is proposing durable, flexible and scalable antenna diversity systems
for both fibre and coax domains...
Ka-Band in SATCOM
Ever
increasing
demand
for
more bandwidth in the terrestrial
wireline and wireless domain on a
global scale and the requirement
for ubiquitous broadband network
access pose significant challenges as
well as chances for satellite network
operators.
While spectrum is being re-farmed
to enable more wireless broadband
access satellite operators will increase
utilisation of higher band spectrum
and introduce new modulation
schemes to be able to increase
bandwidth for future broadband
services. As such satellite networks
are in position to play a key role in
next generation global converged
communications networks.
The immanent advantage of satellite
networks compared to all other
networks is that they can address
any geographic location at any time
and from any desired location with
scalable, stationary and even mobile
services. Emerging mainly from
broadcasting-only satellite networks
have emerged to versatile and scalable
media and broadband services
networks.
However, higher bands, such as
Ka-band, come with challenges when
it comes to efficient and reliable
transmission. Key for all operators
is flawless operation 24/7 to ensure
highly reliable services.
As one of the pioneers in satellite
ground
communication
DEV
Systemtechnik supports matching
solutions.
Rain fade at Ka-band
Ka-band in satellite communications
plays an increasing important role
today. However, at higher frequencies,
electromagnetic wave absorption
increases.
At Ka-band frequencies this can
lead to service interruptions and
performance degradations during rain

Site diversity

fades. With high atmospheric losses,
conventional fade margin approaches
such as adaptive-waveform techniques
or adaptive-power control techniques
are not sufficient for compensation.
For reliable and highly available
operations,
only
site
diversity
configurations on the ground provide
an adequate, fail safe solutions.
Site diversity
In order to mitigate the impacts
of adverse weather conditions, two
antenna sites for bi-directional signal
transmission are linked with one main
and one back up/diverse antenna
configuration. Distance between main
and back up antenna would be miles
away ensuring they will have different
weather conditions. And when one hub
experiences rain or very high humidity
and detects the degradation on the
link, the pre-set algorithm triggers a
switchover to the other hub where the
ski is still clear.
Challenges
The distance between main and
diverse sites is typically larger than 30
km which demands:
*	 Signal integrity that is provided
by a high optical budget RFoF
distribution system.
*	 Precise time synchronisation with
tailor made delay line configuration.
*	 Flexibility to boost the signal
depending
on
given
network
conditions with EDFAs,
*	 Switching and routing on coax
domain by different size and functional
redundancy and matrix switches.
*	 Scalability for future extensions
with module based systems - pay as
you grow.
*	 Easy management both locally
and remotely with sophisticated
interfaces.
*	 Modular building blocks for
matching configurations, optional
individual customisation since each
site is different.

Link Redundancy Options and
Required Fibre Numbers
The whole set up of all critical
elements of the signal chain should
be redundant. And the redundancy in
such critical systems can be tailored in
various ways including:
1+1 redundancy configuration: This
solution not only provides antenna
redundancy against rain fade but also
provides protection against any risks
in the long haul signal chains such
as fibre damage or in the unlikely
event that a system component in
the signal chain has a failure. It also
allows flexible and safe exchange of
components during life transmission
without any signal interruption. This
is a common configuration in mission
critical applications.
With this configuration if the there
is a maintenance on the fibre that is
coming from diverse site to main site
and at the same time the rain fade
happens at the main antenna site
(means two failure is happening at the
same time), it will still switch to the
diverted back-up antenna by using the
back-up fibre routing from diverse to
main site.
n+1 redundancy configuration: At its
most simple definition, N+1 basically
means that there is one backup link in
place for all single system component
fail of a critical system. The 'N' in
this equation stands for the number
of links required to run the signal
transmission system. The '+1' means
there is one independent backup link
in case of fail of any main links.
If in normal operation the RF level
of one of the n main channels on the
receiver side drops below the defined
RF threshold, it commands the
transmitter side to switch this channel
to the redundancy channel.

Key Ground Station Components
of Diversity Systems
RFoF Sub Systems:
*	 The versatile Indoor DEV 7113
space saving chassis is able to house
up to 16 optical DWDM transmitter
modules (DEV 7251), or up to 20 optical
receive modules (DEV 7333).
*	 DEV 7152 Outdoor Chassis
has been developed for maximum
reliability under harsh environmental
conditions.
*	 EDFA optical amplifier modules
are available either for the DEV 7113
chassis or with 1RU standalone unit.
*	 To ensure synchronisation in
time, a Delay Line is used for the local
route (DEV 7859).
*	 To control the remote antenna
site equipment, DEV implemented an
Ethernet Link over fibre or coax.
Coax Sub Systems - Switching and
Distribution:
*	DEV 1951/1953 Universal Switching
Platform for maximum system
availability and reliability. Up to
16 Redundancy Switches can be
populated within DEV 1953 and each
switch can have its own configuration
and switching mode depending on the
signal type.
*	 ARCHIMEDES L Band Matrix
handles
both
redundancy
and
switching actions with a variety of
modules and functions. ARCHIMEDES
series
comes
with
Fan
Out
(Distributing) and Fan In (Combining)
options which both of them can be
configured with the desired size and
options.
*	 Also
DEV's
RF
Splitters,
Distribution Amplifiers or Combiners
are used to distribute and amplify RF
signals, to compensate for signal loss,
and to provide redundancy functions
to ensure maximum uptime.


http://www.inbroadcast.com https://dev-systemtechnik.com/

In Broadcast - October 2020

Table of Contents for the Digital Edition of In Broadcast - October 2020

Contents
In Broadcast - October 2020 - Intro
In Broadcast - October 2020 - Cover1
In Broadcast - October 2020 - Cover2
In Broadcast - October 2020 - Contents
In Broadcast - October 2020 - 4
In Broadcast - October 2020 - 5
In Broadcast - October 2020 - 6
In Broadcast - October 2020 - 7
In Broadcast - October 2020 - 8
In Broadcast - October 2020 - 9
In Broadcast - October 2020 - 10
In Broadcast - October 2020 - 11
In Broadcast - October 2020 - 12
In Broadcast - October 2020 - 13
In Broadcast - October 2020 - 14
In Broadcast - October 2020 - 15
In Broadcast - October 2020 - 16
In Broadcast - October 2020 - 17
In Broadcast - October 2020 - 18
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In Broadcast - October 2020 - 20
In Broadcast - October 2020 - 21
In Broadcast - October 2020 - 22
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In Broadcast - October 2020 - 26
In Broadcast - October 2020 - 27
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In Broadcast - October 2020 - 30
In Broadcast - October 2020 - 31
In Broadcast - October 2020 - 32
In Broadcast - October 2020 - 33
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In Broadcast - October 2020 - 70
In Broadcast - October 2020 - 71
In Broadcast - October 2020 - 72
In Broadcast - October 2020 - 73
In Broadcast - October 2020 - Cover3
In Broadcast - October 2020 - Cover4
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