Bosch Appliances 3.5 32.7Failsafe, IP Addresses, Connecting an alarm buzzer, Introduction, Rules

Praesideo 3.5 Installation and User Instructions 7 System Hardware Installation

en 302

32.7Failsafe

32.7.1 Introduction

When the Praesideo system must be used as an emergency sound system, the network layout must be failsafe. A failsafe network allows to make calls even if the network controller fails. To achieve this, 'emergency' call stations must be put in the system. However, it is not possible to put them just anywhere in the system.

32.7.2 Rules

When creating a failsafe layout, observe the following rules:

1 Label the call station as an 'emergency' call station using the configuration section of the web interface (see table 43.11).

2The emergency call station must have a supervised back-up power supply. If the network controller fails, it cannot provide power to the system bus anymore. The call station, however, must remain functional and therefore it must be powered by another power source. So, connect the emergency call station to the network using a fiber interface that uses a supervised

external power supply or use an externally powered call station kit.

3Do not put equipment between the emergency call station(s) and the power amplifier(s) that:

•under normal circumstances uses power from the system bus and

•has no back-up power supply connected. Suppose the network controller fails, then these units are not functioning anymore, because they are not connected to any power source. As a result, it is not possible for them to route signals and therefore they may not be put between the emergency call

station(s) and the power amplifier(s).

4Do not put the emergency call station(s) in a tap-off. The emergency call stations must be in the main

network. This is the only way to ensure that calls can be made to all zones.

5It is not allowed to connect local volume control systems to the loudspeakers even if they have a volume override facility. If the network controller is absent, the control outputs that activate the volume override systems are not activated anymore (even if the control outputs are located on power amplifiers or audio expanders). Furthermore, a local volume

control system disturbs the operation of the line supervision. The line supervision set uses the loudspeaker line. Any volume control in the line would attenuate the 20 kHz pilot tone of the supervision-master too much for the supervision-slave to work correctly.

32.8 IP Addresses

In the Praesideo network do not use the following IP addresses for network controllers, PCs with Praesideo software (for example, Logging Server, Logging Viewer), CobraNet Interface, etc.:

•All IP addresses of which the host part is 0. For example, if the subnet mask is 255.255.255.0, do not use the address x.x.x.0.

•All IP addresses of which the host part is 255. For example, if the subnet mask is 255.255.255.0, do not use the address x.x.x.255.

•127.0.0.1

•14.0.0.1 - 14.0.0.254

•24.0.0.1 - 24.0.0.254

•39.0.0.1 - 39.0.254

•128.0.0.1 - 128.0.255.254

•169.254.0.1 - 169.254.255.254

•172.16.0.1 - 172.16.15.254

•191.255.0.1 - 191.255.255.254

•192.0.0.1 - 192.0.255.254

•192.88.99.1 - 192.88.255.254

You can use the following IP addresses, but remember that it is not possible to access the Internet with these addresses:

•10.0.0.1 - 10.255.255.254

•172.16.16.1 - 172.31.255.254

•192.168.0.1 - 192.168.255.254

•224.0.0.1 - 239.255.255.254

If you enter IP addresses in the Praesideo software, always omit leading zeroes, since they can cause network problems. For example, type 192.68.0.10 instead of 192.068.000.010.

32.9 Connecting an alarm buzzer

Many Praesideo installations require the connection of an alarm buzzer, providing an audible signal to indicate a fault situation, an emergency situation, or both. This buzzer is typically mounted in the main 19-inch rack in a technical room, together with the Praesideo network

Bosch Security Systems 2011-02