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Bosch Security Systems | 2011-02
2011-02 | Installation and User Instructions | 2 | Introduction en | 76
2 System overview
2.1 Introduction
Praesideo is a fully digital public address system that
meets all the requirements placed by professional users
on a public address/emergency system. The system
brings highly innovative and advanced digital
technology to the public address market. The processing
and communication of both audio signals and control
data entirely in the digital domain makes the system a
superior public address and emergency sound system.
Digital signal processing allows significant
improvements in audio quality to be achieved. The
Praesideo system is designed for configuration from a
PC, which makes installation and setting of operating
parameters very simple and user-friendly.
The Praesideo system satisfies almost all public address
and voice alarm system requirements. All audio
processing is performed in the digital domain.
Communication between the units is via plastic fiber or
glass fiber cabling, depending on the distance between
the units. The cabling uses the daisy chain principle.
This makes the cabling and installation very quick,
simple and easy. The system cabling supports a closed
loop, which allows redundancy to be achieved. If
redundancy is not required, also branching is possible.
2.2 User-friendly software control
The system is supplied with user-friendly software for
system configuration. This allows all system functions to
be configured. The software is based on web
technology, which gives authorized users full freedom of
configuration in terms of time and location. The
simplified and accurate organization of the
programming features makes navigation highly user-
friendly and fault-tolerant. The software also provides
clear indication of any parameters, which have not been
configured before exiting from any stage of the
configuration process.
2.3 Networked approach
The system architecture is based on daisy-chaining of
units. It is possible to add or remove equipment
anywhere in the network without affecting the
performance of other units, provided that the network
connection is available. This makes the system easily
expandible by the customer, without adding any
additional electronics at the network controller unit.
Thanks to this network architecture, users can start with
a small system in the initial stage and expand the system
later simply by adding the required new units to the
existing network. The system can be configured for
redundant cabling using a ring cabling structure.
2.4 Distributed control
The system is designed for distributed control of various
system functions. The external interfaces which are
control inputs and outputs can be located anywhere in
the network. The processing of audio input and output
signals is located in each unit. This allows the network
controller to concentrate on other activities like routing
of announcements and taking actions on control inputs,
etc. As a result the response times are much shorter than
for systems with centralized processing of all signals.
2.5 Combination of functions
The Praesideo range of equipment has multiple
functions combined in a single unit. This feature
drastically reduces the number of different types of
equipment used in the system. Functions like audio
processing, audio delay, amplifier monitoring and
automatic amplifier change-over and receivers for
speaker line monitoring are provided in the power
amplifier unit itself. This makes the overall system
highly cost-effective. The flexible architecture of the
Praesideo range of equipment allows the customer to
locate any type of equipment anywhere in the building.
The configuration software enables the user to configure
all the functional parameters. No programming is
required at the equipment end, which drastically
reduces the installation and commissioning time.