Dcn-Ccu2 And Dcn-Ccub2 Central Control Unit - Bosch DCN Next Generation Installation And Operation Manual

Conference System
System problems
Problem
Noise can be heard in the system.
The system does not operate correctly, but you
do not know what the problem is.
9.2

DCN-CCU2 and DCN-CCUB2 Central Control Unit

Problem
–
–
–
–
–
Bosch Security Systems B.V.
Hint
You cannot start the –
CCU
The CCU does not –
control the video
cameras correctly.
A trunk does not –
receive power from
the system and the –
overload LEDs on the
CCU or the extension –
power supply do not
come on. –
A trunk does not –
receive power from
the system and the
overload LEDs on the
CCU or the extension
power supply are on.
A multi CCU system –
does not operate
correctly, but you
cannot tell what the –
problem is.
Installation and Operation manual
Hint
Earth the system at one point only (refer to
Section 7.3 DCN-CCU2 and DCN-CCUB2
Central Control Units).
– An 'open-ended' DCN cable without a
cable termination plug can cause the
problem. Connect cable termination
plugs to all 'open-ended' DCN cables.
– A transmitter which was connected
while being switched on can cause the
problem. Switch the transmitter off
and on.
The central control unit is not connected to a mains power
supply.
The RS232 port of the central control unit are not
configured correctly. Refer to Section 7.3 DCN-CCU2 and
DCN-CCUB2 Central Control Units for instructions that tell
you how to configure the RS232 port of the central control
unit.
The trunk is disconnected from the CCU or extension
power supply.
The trunk contains a defective extension cable. Find the
defective extension cable and replace it.
The system mode of the CCU is set to Standby or Off on
front panel of the CCU or conference software.
The trunk contains a defective extension cable. Find the
defective extension cable and replace it.
The devices that are connected to the trunk ask for too
much power. Use the calculation tool to re-calculate the
power consumption of the devices and the extension
cables that are connected in the trunk.
Check whether each sub system operates correctly in
single CCU mode (refer to Section 7.3 DCN-CCU2 and DCN-
CCUB2 Central Control Units).
Disturbance on the optical network caused by connecting a
device in a running system could cause a problem. If the
problem persists: switch off and on one by one all devices
connected with the optical network, starting with the
master CCU (refer to Section 4.2 Optical network design).
Troubleshooting | en 259
DCN-NG_IOM_V4.1 | V1.3 | 2012.07