Bosch DCN Next Generation Installation & User's Instructions page 74

DCN Next Generation | Installation and User Instructions | Central Devices
9.5.4 Audio inputs
You can connect an external analog audio source to the
audio inputs of the basic central control unit. The basic
central control unit has two audio inputs. Each audio
input has a double cinch socket for unbalanced signals
(refer to figure 9.2).
Note
The audio inputs change stereo signals in mono
signals.
Audio In
figure 9.2: Audio input, connection
table 9. 1 : Audio input, connection
Pin Type
1 Cinch
2
You can select the procedure that is used to send audio
signals through the basic central control unit with the
audio routing modes (refer to section 8.10.11).
Note
You can only connect line level sources to the
audio inputs of the basic central control unit. It is
not possible to connect microphone sources.
Bosch Security Systems | 2007-02 | 9922 141 70525
2
1
Signal Description
Live Signal in
Return Shield/ground
table 9.2: Audio input details, line level signals
Number of connections:
1x double cinch socket
Location:
Rear side
Cable:
Shielded cable
Maximum level:
Refer to appendix A
Nominal level:
Refer to appendix A
Frequency response:
-3 dB @ 20 Hz and 20 kHz
Impedance:
12 kΩ
Signal-to-noise ratio:
> 85 dBA @ max. level
CMRR:
> 40 dB
Crosstalk attenuation:
> 85 dB @ max. level
Distortion:
< 0.05% @ 1 kHz @ -3 dB of the max. input
9.5.5 Audio outputs
You can connect an audio recording device or a public
address system to the audio output of the basic central
control unit. The basic central control unit has two
audio outputs. Audio output 1 has (refer to figure 9.3):
• 1 XLR plug for balanced signal (no transformer
inside)
• 1 double cinch socket for unbalanced signals.
Audio output 2 only has a double cinch socket for
unbalanced signals.
1 2
Audio Out
3
figure 9.3: Audio output, connection
en | 74
5
4