Bosch 3922 988 43318 User Manual
2
Bosch Security Systems | 04-2003 | 3922 988 43318 en
Digital Congress Network | Installation and Operating Manual | Chapter 4 - Central Control Equipment
en | 4-12
CCU Audio Routing Modes
4.9 CCU Audio Routing Modes
To provide additional functionality in the CCU, the DCN software from release version 7.01 includes
two new ‘Audio Routing’ modes - ‘MIX-MINUS’ and ‘INSERTION’ mode. Both modes are selected by
setting DIP-switches (S9) on the TCB4 card located in the Central Control Unit CCU
two new ‘Audio Routing’ modes - ‘MIX-MINUS’ and ‘INSERTION’ mode. Both modes are selected by
setting DIP-switches (S9) on the TCB4 card located in the Central Control Unit CCU
(see
).
MIX-MINUS mode
The main feature of this mode, is that audio signals connected to the ‘Line-Input’ of the CCU are no
longer routed to the ‘Line-Output’ of the CCU. This feature is especially desired for the following
applications:
longer routed to the ‘Line-Output’ of the CCU. This feature is especially desired for the following
applications:
1. Where a remote audio connection is made via a telephone coupler for connection to a remote
delegate or specialist speaker.
2. To interconnect two DCN systems.
IMPORTANT!:
In the ‘Mix Minus’ mode, a permanent audio channel is used for ‘Line-Input’.
Therefore the number of available interpretation channels is one channel less than in the standard
mode (i.e. 10 channels instead of 11 channels as available in ‘Stand-alone’ and ‘Multi-CCU’ systems.
mode (i.e. 10 channels instead of 11 channels as available in ‘Stand-alone’ and ‘Multi-CCU’ systems.
NOTE:
For recording the total audio signal (i.e. Floor + Line-Input) use an Audio Media
Interface unit LBB 3508/00 on channel 0
(see
Using this mode of operation, the audio connection is considerably improved, and avoids ‘Echo’ due
to feedback as was experienced in the standard mode of operation.
to feedback as was experienced in the standard mode of operation.
gives an example of ‘Audio Routing’ in the CCU’s and the external routing for connection of
two DCN systems A and B.
NOTE:
If connection is done via the Public Telephone Network, telephone couplers must
be used
(not shown in
Installation:
To set the CCU for the Mix-Minus mode Dip-switch ‘S9’ on the Trunk
Communication Board must be set as follows:
Communication Board must be set as follows:
FIG 4-8 ‘MIX-MINUS’ mode
DIP-switch S9
Switch-2
Switch-3
Mode
Off
Off
Standard
On
Off
Mix-Minus
∑
∑
∑
∑
DCN System A
CH.13
CH.12
CH.0
CH.14
CH.14
CH.13
CH.12
CH.0
CCU Volume
Line-OUT
Line-OUT
Line-IN
Line-IN
CCU Volume
DCN System B
Mix-Minus
Insertion OUT
Insertion OUT
Mix-Minus
Insertion IN
Insertion IN
Mix-Minus
Insertion IN
Insertion IN
Mix-Minus
Insertion IN
Insertion IN
Master volume
PC control
PC control
Master volume
PC control
PC control
Delegate/Chairman
microphones
microphones
Interpreter headphones
Unit loudspeaker
Delegate headphones
Unit loudspeaker
Delegate headphones
Equalizer PA
Local PA (MCCU)
Local PA (MCCU)
Delegate unit
loudspeaker
loudspeaker
(See
(
)