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Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | 7 | System Hardware Installation en | 301
32.6 CobraNet
CobraNet is a standard for transporting multiple digital
uncompressed audio channels over Ethernet. Many
manufactures of public address and professional audio
equipment support this standard. CobraNet has all the
advantages of Ethernet: structured cabling using Cat-5
and GOF to cover long distances and cheap network
components. In Praesideo systems, the LBB4404/00
CobraNet Interface is used to interface between
Praesideo and CobraNet. These CobraNet interfaces
can be used to:
• Connect Praesideo systems (see figure 32.4 for an
example).
• Benefit from already existing Ethernet infrastructure.
• Transport audio over large distances.
PC data such as Praesideo Open Interface data can
coexist with CobraNet on the same Ethernet network as
long as managed Ethernet switches are used. See:
http://www.cobranet.info/en/support/cobranet/design/
Because of delay variations, it is not allowed to connect
more than 7 switches in series.
Fast Ethernet distance limitations apply to CobraNet
installations: 100 meters over Cat-5 copper cable, 2
kilometers over multimode fiber. Proprietary Fast
Ethernet via single mode fiber solutions can reach even
further.
Note
The CobraNet interface does not transfer
control functions. These can only be transferred
over Ethernet using the Praesideo Open
Interface. Network controllers are always open
interface slaves, which must be controlled by an
open interface master, for example a PC Call
Station.
figure 32.4: Connecting systems
Praesideo Praesideo
Ethernet backbone
Switch Switch
CAT-5/GOF (long distance)
Ethernet
CobraNet
Ethernet
TCP/IP
Ethernet
CobraNet
Ethernet
TCP/IP
Ethernet
TCP/IP
Control
Audio
Control
PC Call station
PRS-NCO-B
Network Controller
LBB4404/00
CobraNet Interface
LBB4404/00
CobraNet Interface
PRS-NCO-B
Network Controller