Bosch Appliances 3922 988 43318 manual Installation equipment, DCN’s System Philosophy, Praedic

Digital Congress Network Installation and Operating Manual Chapter 1 - Introduction to DCN en 1-3

1.6Installation 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 1-1shows 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

			PC-bus
			ACN 1	PRAEDIC
PRAEDIC	ACN 1		LBB 3510/00
			Network card
DCN Discussion
Delegate/Chairman/Interpreter
(contribution & distribution)				ACN 1	PRAEDIC
		cabling		ACN 3	DAC
DAC	ACN 3
		Network		e.g Hall Display
Channel selector unit
			Delegate/Chairman unit (Concentus)
(language distribution)
ACN 1 - up/down			ACN 1	µProc.
ACN 2 - up/down
ACN 3 - down only			LBB 3512/00
			Data Distribution Board

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.

µProc.

ACN 1

ACN 2

FLASH	RAM	DSP
EPROM

PRAEDIC

CONTROL

PANEL

PERSONAL

COMPUTER

Alternative for PC with LBB 3510/00 Network card

Central Control Unit (CCU)

FIG 1-1 DCN’s digital communication technique

Bosch Security Systems 04-2003 3922 988 43318 en Installation equipment.