Bosch DCN Next Generation Installation & User's Instructions page 27

DCN Next Generation | Installation and User Instructions | System Design and Planning
2.7.3 Redundant optical network
The basic optical network (refer to figure 2.5) has no
redundant cables. If the cable between the central
control unit (DCN-CCU) and the audio expander
(LBB4402/00) breaks, the central control unit cannot
transmit data to the audio expander. A solution for this
problem is to use a redundant cable (refer to figure 2.6).
LBB4404/00
PRS-4DEX4
figure 2.6: Redundant optical network
The basic system with no redundant cables has no
connection between the cobranet interface
(LBB4404/00) and the central control unit (DCN-CCU).
A system with redundant cables has a connection
between the Cobranet Interface and the central control
unit. This connection makes a ring. If a cable breaks, the
optical network continues to operate.
The maximum total power of all devices in the
redundant optical network is 65 W. If the optical
network is defective near the central control unit, the
other socket can supply power to all of the optical
network.
Bosch Security Systems | 2007-02 | 9922 141 70525
DCN-CCU
LBB4402/00
INT-TX
2.7.4 Tap-offs
The network splitter (LBB4410/00) lets you make
tap-offs (refer to figure 2.7). Tap-offs cannot be
redundant. If the cable between the network splitter and
the digital audio expander (PRS-4DEX4), becomes
defective, the digital audio expander has no connection
to the central control unit.
DCN-CCU
LBB4410/00
PRS-4DEX4
figure 2.7: Redundant optical network with tap-off
en | 27
LBB4402/00
INT-TX