Bosch Security Systems | 2005-04 | 9922 141 10364en
Plena Voice Alarm System
| Basic System Manual | Configuration
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4.5.11 1 channel and 2 channel
operation
4.5.11.1
Introduction
If the
2ch operation
switch (see figure 4.1) is in the
ON
position, the voice alarm controller operates in the
2-channel mode. If the
2ch operation
switch is in the
OFF
position, the voice alarm controller operates in the
1-channel mode.
4.5.11.2
1-channel mode
In the 1-channel mode, all calls and BGM are amplified
by the internal power amplifier of the voice alarm
controller. If desired, an external power amplifier can
be connected for spare switching (see section 3.9). In 1-
channel mode, all calls will interrupt the BGM. The
external power amplifier is not supervised (see section
4.5.10).
4.5.11.3
2-channel mode
In the 2-channel mode, the BGM is amplified by the
internal power amplifier of the voice alarm controller.
The calls are amplified by the external power amplifier,
which is connected to the voice alarm controller
(see section 3.9). If the external power amplifier is
faulty, the calls are amplified by the internal power
amplifier. In 2-channel mode, calls do not interrupt the
BGM. Both the internal power amplifier and the
external power amplifier are supervised (see section
4.5.10).
4.6 VOX
configuration
4.6.1
Introduction
The type of source that is connected to the mic/line
input with VOX functionality is set using the
Mic/Line
switch on the rear of the voice alarm controller (see
figure 4.3).
•
If the source is a microphone, put the switch in the
Mic
position.
•
If the source is a line-level source, put the switch in
the
Line
position.
The mic/line input with VOX functionality is
configured using DIP switches on the rear of the voice
alarm controller (see figure 4.4). By default, all switches
are in the
OFF
position.
The settings that can be made using the DIP switches
are explained in a table on the rear of the voice alarm
controller (see figure 4.5).
table 4.4: 1-channel mode
Amplifier
Function
Internal
BGM/Call power amplifier
External
Not connected/Spare power amplifier
table 4.5: 2-channel mode
Amplifier
Function
Internal
BGM/Spare power amplifier
External
Call power amplifier
figure 4.3: VOX input source switch
figure 4.4: VOX settings
figure 4.5: VOX settings table
Phantom power
Vox
Speech filter
Off
On
Mic/Line
Phantom power
Vox
Speech filter
Off
On
Mic/Line
1 VOX activate by mic.
2 Speech filter
3 Phantom power Off
VOX activate by VOX Switch
Flat
Phantom power On
Off
On
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