2011-02 Installation and User Instructions 2 Introduction

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3.2.5 Timing

Most calls are broadcast immediately, but calls can be time-shifted for broadcasting after completion of the original call. This avoids acoustic feedback between the microphone and nearby loudspeakers. A time-shifted call can also be pre-monitored to check the content before it is broadcast and optionally cancelled. This feature is only available in combination with a call stacker (see chapter 23).

3.2.6 System size

The maximum size of a single Praesideo system is limited by the maximum number of nodes in a system, which is 63, and the maximum length of the system bus, which depends on the actual number of nodes in use. See section 31.4 and 31.5 for details.

The mandatory network controller occupies 3 nodes, leaving 60 nodes for other system elements, such as amplifiers and call stations. Different models of Praesideo power amplifiers have 1 - 4 outputs per occupied node and each output can serve an independent voice alarm zone. This adds up to a maximum of 240 voice alarm zones for a single system. This number can be increased by coupling of multiple subsystems, as indicated in section 32.6. Alternatively, the maximum number of voice alarm zones can be increased by using a combination of basic amplifiers and multi channel interfaces, see section 9 and 10. A multi channel interface occupies only 1 node and can drive 14 independent voice alarm zones. For response time reasons it is recommended not to use more than 20 multi channel interfaces in a system. Together with the other power amplifiers and call stations, this yields a practical limit of some 400 voice alarm zones in a single system.

3.3Types

3.3.1Introduction

As mentioned before, Praesideo uses the following types of calls:

•BGM (background music) calls (see section 3.3.2).

•Normal calls (see section 3.3.3).

•Emergency calls (see section 3.3.4).

3.3.2BGM calls

BGM (background music) calls are typically used to distribute background music. Their content consists of an audio signal from a BGM source, such as a CD player or a tuner. By default, BGM calls are partial calls. Zones can be added to the routing of a BGM call at any time. If an added zone is already in use by another call with the same priority or higher, the BGM call will not be routed to that zone until it has been released by the other call.

3.3.3Normal calls

Normal calls typically contain live speech and optionally chimes and prerecorded messages. The content of normal calls is defined by a call macro (see section 3.2.3). Normal calls can be partial, non-partial, or stacked.

3.3.4Emergency calls

Emergency calls are similar to normal calls (see section 3.2.3). The major difference is that emergency calls put the system in the emergency state and are always partial. In the emergency state, Praesideo stops all BGM calls and normal calls.

Bosch Security Systems 2011-02

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Bosch Appliances 3.5 manual Types
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3.5 specifications

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