Bosch 3.5 User Manual

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

Ethernet backbone

Switch

CAT-5/GOF (long distance)

Ethernet
CobraNet

Ethernet
TCP/IP

Ethernet
CobraNet

Ethernet
TCP/IP

ontrol

Audio

ontrol

PC Call station

PRS-NCO-B
Network Controller

LBB4404/00
CobraNet Interface

PRS-NCO-B
Network Controller