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Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | 3 | Control Equipment en | 106
6 LBB4402/00 Audio
Expander
6.1 Introduction
The LBB4402/00 Audio Expander is used if the system
requires additional audio inputs and outputs. See
figure 6.1 for a block diagram of the audio expander.
Unlike the network controller, the audio expander has
transformer-isolated and balanced XLR inputs and
outputs for easy interfacing to other systems.
Furthermore, control inputs and outputs are available.
6.2 Controls & connectors
6.2.1 Front view
The front of the audio expander (see figure 5.2) contains
the following:
1 Menu display - A 2x16 character LCD display
gives information about the audio expander (see
section 6.5).
2 Menu button - A turn-and-push button to operate
the menu (see section 6.5).
3 Monitoring headphones output - A 3.5 mm
(0.14 inch) jack socket to connect headphones for
audio monitoring purposes.
figure 6.1: Block diagram of the audio expander
A/D D/A
Network
processor
+
DSP
Display + Control
Audio outputsAudio inputs
Control inputs
POF
POF
Control outputs
Network
redundancy
switching
IO