Installation Equipment - Bosch Digital Congress Network Installation And Operating Manual

Digital Congress Network | Installation and Operating Manual | Chapter 1 - Introduction to DCN

1.6 Installation equipment.

Fast cost-saving installation is an important benefit of the DCN's digital technology. A thin twin-coaxial
cable carries all the system's digital signals, eliminating the need for the costly and vulnerable multi-
core cables used in conventional analogue installations. The same cable is used to transport the signals
to all delegates' microphone units throughout the system and can be 'tapped off ' at any desired point
to connect the microphone units or any system unit associated with the DCN system. Later capacity
extensions - for example to add extra microphone units does not demand changes to the system
cabling. All that is needed is to connect the required DCN system units or branches to the installed
cabling. Trunk-line splitters and extension cable assemblies are available to simplify installations in
difficult working areas.
DCN's System Philosophy.
The DCN introduces the latest digital technology, bringing far reaching benefits to the audio quality, as
well as to promote the addition of a wide range of external peripheral equipment to conference
systems.
FIG 1-1 shows the concept of DCN's digital communication techniques. The Network cabling forms
the system infrastructure providing the communication media between the Microprocessor
controlled Central Control and all units connected to it. Using standard plugs and connectors
throughout the system means that units can be connected to the Network at any convenient points,
making installation quick and simple.
Communication through the Network cabling and all units connected to it, is done using three
dedicated digital communication IC's, ACN 1 , ACN 2 and ACN 3. Units that include an ACN 1
microprocessor - such as the delegate unit, chairman unit and interpreter desk - communicate to the
Central Control Unit, via the units ACN 2 microprocessor on a send and receive basis (active or
passive). Units that include an ACN 3 microprocessor - such as the Channel selector units - receive
information on a receive basis only, such units are known as passive units.
Praedic
The integrated circuit (IC), PRAEDIC (Professional Audio Encoder Decoder Integrated Circuit)
combines a built-in amplifier with both Analogue-to-Digital and Digital-to-Analogue convertors. The
IC converts analogue signals (such as from a delegates' microphone) and digitizes them for
distribution throughout the DCN network cabling. In return the digitize signal is then fed back to the
Praedic and converted back to an analogue signal for distribution throughout the DCN units - such as
delegate loudspeakers and headphones.
Bosch Security Systems | 04-2003 | 3922 988 43318 en
PRAEDIC
DCN Discussion
Delegate/Chairman/Interpreter
(contribution & distribution)
DAC
Channel selector unit
(language distribution)
ACN 1 - up/down
ACN 2 - up/down
ACN 3 - down only
Central Control Unit (CCU)
FIG 1-1 DCN's digital communication technique
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PC-bus
ACN 1
PRAEDIC
ACN 1
LBB 3510/00
Network card
ACN 1
PRAEDIC
DAC
ACN 3
ACN 3
Delegate/Chairman unit (Concentus)
e.g Hall Display
µProc.
ACN 1
LBB 3512/00
Data Distribution Board
PRAEDIC
ACN 1
ACN 2 CONTROL
PANEL
FLASH
µProc.
RAM DSP
EPROM
en | 1-3
2
PERSONAL
COMPUTER
Alternative for PC
with LBB 3510/00
Network card
Installation equipment.