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Traffic | Transport | Logistics |
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| If the conditions
for data networks unfavourable, the technology has to
be so much better. |
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Pandatel has developed a comprehensive product range
ensuring fail-safe data transmission.
Industrial environments can be demanding. Numerous
sources of interference and the often long distances
between industrial plants puts enormous demands on
data networks. Often, electromagnetic disturbances
lead to poor connections, with the resulting transmission
errors detrimentally affecting the availability of
the systems. In particular for sensitive applications
(airports, signal technology for railways, command
technology in buildings, access control, hospitals,
etc.), even minor system failures can cause extensive
damage or risk to safety. Here, fiber optic technology
is best used for data transmission. Optical fibers
are resistant to
electromagnetic disturbances, basically tap-proof,
and offer great bandwidth with little transmission
loss. Long transmission distances can be reached due
to the low transmission loss.
The number of active components is thus reduced, eliminating
possible sources of errors, reducing costs, and ultimately
increasing the availability of the system.
Following the area of installation the products within
the field of Industrial Communications can be divided
into two groups:
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Industrial Data Transmission |
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Security and Monitoring
Technology |
Industrial Data transmission is based on the use
of standardized interfaces (e.g. RS485, RS422, RS232
and 20mA) and protocols (Interbus, Profibus etc.).
The typical fields of use are automation technology,
command technology for technologies, signal technology,
telecontrol engineering and process control technology.
The main areas of use in the field of Security and
Monitoring technology for video monitoring systems
are airports, tunnels, innercities, museums, department
stores, barracks, etc. This field typically has both
digital data signals and analog video signals.
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Products for
Traffic-Transport-
Logistics-Solutions |
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1. Project with the Athens airport
The Problem: The project dealt with
building control systems / facility management.
In this special case, communication (“direct
digital control” or DDC) between the various
airport systems (heating, ventilation, air-conditioning,
sanitation, etc.) and several control stations
that monitor these systems was to be ensured.
Long delays and data losses could cause a failure
in the entire facility management system - a
risk that had to be ruled out. With the overall
surface area of 1,244 hectares, the challenge
for data transmission is clear. Enormous distances
with transmission losses that would require
the use of repeaters if copper cables were used.
The Solution: The Fiber Optic Multidrop
Network FD came into operation. These units
provide connections between all sub-stations
in a “daisy chain” topology, i.e.
the sub-stations are connected to the central
control station in a chain and share the same
fiber optic line. To increase security, two
data transmission topologies were mixed: Star
and Multidrop (Daisy Chain) topology. Thus,
various data streams from different stations
can be connected in a star shape to the central
station.
The Benefits: The airport at Athens
used a multimode optical fiber technology for
building communications. With a core diameter
of 62.5 µm and a transmission wavelength
of 850 nm, this type of optical fiber has proven
its worth, especially for distances up to 3
km. The star topology ensures that disturbances,
will not lead to total system failure, only
one transmission link would be affected. The
remaining system will not be effected. For this
reason and because of the fact that various
cable routes run across the open grounds the
airport management chose to have transmission
done via fiber optics.
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2. Railway project with Alcatel
The Problem: The area monitored by an
electronic signal box (ESTW) can consist of
several train stations, some of which may be
very far from each other. The modules at operating
and security level are in the ESTW center. The
element control modules (ECM) are found in the
other train stations along the track. In the
past a space multiplex technique was used for
communication between ESTW and ECM, i.e. two
pairs were required for each connection between
ESTW and ECM. Increasing size of the signal
box results in a greater number of pairs.
The Solution: An appropriate solution
is a multiplex technique which bundles several
signals on one transmission path. Because of
operational security, distance, and data rate,only
fiber optic can be considered. The transmission
system must be transparent to the data and transmit
data telegrams errorfree,
so that the transmission protocol including
data security remains the task of the connected
ESTW modules. A high degree of reliability through
redundance on the transmission line is a further
criterion, whereby the ring is realized by laying
fiber optic cable on
The Benefits: In order to create redundance,
the multiplexers are always used in pairs at
the ECMs, whereby unnecessary channels are slipped
through 1:1. The data channels redundant to
each other are led through different branches
of the ring. This prevents a cable break or
device failure from affecting system function.
A further advantage of this system is that free
data channels can be used for
transmitting other information.
This system has already been approved by the
Federal Railroad Office and is being used in
many applications.
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3. Traffic monitoring in Prague
The Problem: This project was completed
in two stages. In the first stage, four tunnels
all across Prague were equipped with a decentralized
video surveillance system. The video signals
were to be transmitted to a control station
near the tunnel. From there the respective tunnel
was to be monitored. The monitoring of the tunnel
also includes an area in front of and behind
the actual tunnel. The cameras installed for
this outdoor area had to be controllable. In
the second stage, all signals are to be transmitted
to a central control station, which handles
the control and monitoring of all four tunnels.
The Solution: Fixed cameras for monitoring
were installed in the actual tunnel to ensure
constant monitoring. In light of the transmission
distances, only fiber-optic video converters
of the series FV and FVS were possible, with
the minitransmitter
FVS integrated directly in the camera’s
housing. The counterpart in the control station
was a 19” rack card. Outdoors, controllable
dome cameras were used. As these cameras also
need a data line for controlling the camera
(Pan-Tilt-Zoom), Fiber Optic Video + Data Converters
(FV-C) were used. Here, too, the transmitter
unit was installed near the camera, with the
receiver in a 19” frame. In the second
stage, all of the signals in the four control
stations are transmitted via multiplexers to
the central control station.
The Benefits: Multiplexer technology
reduces the use of fiber-optic cables to a minimum.
The customer was able to complete the project
optimally and with little effort and even saved
space.
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You can download a detailed Transport-Logistik-Trafic-solution brochure by clicking on the icon or you can order it directly.
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