DCN Next Generation | Installation and User Instructions | Flush-mounted Devices
The solder pads and the plug are internally connected
(refer to table 27.8).
table 27.8: External headphones, connection
Plug (pin)
Solder pad
1
X18
2
X16
3
X17
Note
You can connect, for example, an
AMP173977-3 socket to the external
headphones plug of the channel selector.
27.7
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 (refer to figure 27.8) to prevent
acoustic feedback.
figure 27.8: Output level plug, connection
table 27.9: Output level plug, connection
Pin
1
2
Note
You can connect, for example, an
AMP173977-2 socket to the level reduction
plug of the channel selector.
Bosch Security Systems | 2007-02 | 9922 141 70525
Signal
Left
Right
Common
1 2
Signal
Positive
GND
Connect a voltage to the level reduction plug to
decrease the volume level of the signal on the
headphones (refer to table 27.10).
table 27. 1 0: Output level reduction
Voltage
Description
< 1 V(DC)
The output level of the channel
selector is not decreased.
> 3 V(DC)
The output level of the channel
selector is decreased.
These devices have a output level plug that you can
connect to the level reduction plug of the channel
selector:
•
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
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