Bosch Security Systems | 2005-04 | 9922 141 10364en
Plena Voice Alarm System | Basic System Manual | Installation en | 24
3.13 Mic/line input with VOX
functionality
The voice alarm controller has 1 mic/line input with
voice-activated (VOX) functionality (see figure 3.13).
This input has two sockets; one balanced XLR socket
and a balanced 6.3 mm jack socket. The signals from
both sockets are mixed to form a single input signal.
In basic systems, the default priority of the mic/line
input with VOX functionality is 6. This means that it
can be used to make business calls (e.g. with an
LBB1965/00 Plena Message Manager). The input
automatically starts a business call if the input is higher
than -20 dB (100 mV for line and 100 µV for
microphone inputs) or if the VOX switch is closed (see
figure 3.14).
figure 3.13: Mic/line input with VOX functionality
LBB1990/00
L
R
PC
p
Calibration
Mic/Lin
GND
Note
In extended systems, the mic/line input with
VOX functionality can also be used to make
emergency calls. For example, it can be used to
create a supervised link to another emergency
sound system (e.g. a Praesideo system). See
the Installation and User Instructions
(9922 141 1037x) for more information.
figure 3.14: Connecting a VOX switch
LBB1990/00
123456
VOX Switch
123456
24V
DC out
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