Bosch DCN Next Generation Installation And Operation Manual page 84

84 en | Planning
Redundant optical network
If the cable between the central control unit (DCN-CCU2) 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.
Figure 4.15 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-CCU2). 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 85 W. If the
optical network is defective near the central control unit, the other socket can supply power
to all of the optical network.
Tap-offs
The network splitter (PRS-NSP) lets you make tap-offs. 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.
PRS-4DEX4
Figure 4.16 Redundant optical network with tap-off
DCN-NG_IOM_V4.1 | V1.3 | 2012.07
DCN-CCU2
LBB4404/00
DCN-WAP
LBB4402/00
PRS-4DEX4
INT-TX
DCN-CCU2
DCN-WAP
PRS-NSP
LBB4402/00
INT-TX
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