Bosch DCN Next Generation Installation And Operation Manual page 138

138 en | Connection
NOTICE!
You can connect, for example, an AMP173977-3 socket to the external headphones plug of the
channel selector.
WARNING!
When using external sockets of DCN-FCS make sure that all connections are electrically
floating. In case any connections are part of an earth loop unexpected system behavior can
occur.
Level reduction plug
When the channel selector is used with a device that has a microphone, acoustic feedback
can occur.Use the level reduction plug to prevent acoustic feedback.
Figure 6.40 Output level plug, connection
Pin
1
2
Table 6.24 Output level plug, connection
NOTICE!
You can connect, for example, an AMP173977-2 socket to the level reduction plug of the
channel selector.
Connect a voltage to the level reduction plug to decrease the volume level of the signal on the
headphones.
Voltage
< 1 V(DC)
> 3 V(DC)
Table 6.25 Output level reduction
These devices have a output level plug that you can connect to the level reduction plug of the
channel selector:
–
–
–
–
–
DCN-NG_IOM_V4.1 | V1.3 | 2012.07
1 2
Signal
Positive
GND
Description
The output level of the channel
selector is not decreased.
The output level of the channel
selector is decreased.
DCN-CON Concentus Delegate Unit.
DCN-CONCS Concentus Delegate Unit.
DCN-CONFF Concentus Delegate Unit.
DCN-CONCM Concentus Chairman Unit.
DCN-FMIC Microphone Connection Panel.
Installation and Operation manual
Conference System
Bosch Security Systems B.V.