2011-02 Installation and User Instructions 2 Introduction

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3Calls

3.1Introduction

As Praesideo is a public address and emergency sound system, it is used to distribute background music, live speech and evacuation messages. All audio in the system is distributed in the form of calls.

3.2Call attributes

3.2.1Introduction

A call always consists of the following attributes:

•Priority (see section 3.2.2)

•Call content (see section 3.2.3)

•Routing (see section 3.2.4)

•Timing (see section 3.2.5)

3.2.2Priority

To each call, a priority is assigned. When two or more calls are addressed to the same zone or need shared resources (e.g. the message player), the system only starts the call with the highest priority. The range of priorities that is available for a call depends on the type of call (see table 3.1).

Calls with the same priority operate on first come first serve basis, except in the case of priority 255: calls with the same priority 255 overrule each other, so the latest becomes active. This assures that high priority microphones that are left behind in an active state will never block the system.

table 3.1: Priorities and call types

Priority

Call type

0 to 31

BGM calls

32 to 223

Normal calls

224 to 255

Emergency calls

3.2.3 Call content

The content of a BGM call typically consists of an audio signal coming from a BGM source, such as a CD player or a tuner. The content of normal calls and emergency calls is defined by a call macro, which can consist of:

•A start chime

•Prerecorded message(s)

•Live speech

•An end chime

3.2.4Routing

The routing of the call is the set of zones to which the call is intended to be addressed. Whether the call actually is addressed to the selected zones depends on the priority of the call (see section 3.2.2) and its routing scheme.

Each call can have one of the following routing schemes:

•Partial

•Non-partial

•Stacked

By definition, partial calls do not require the entire routing to be available at the start of the call and during the call. When a partial call is started and a part of the routing is not available, the call is only distributed to the available part of the routing. When a part of the routing becomes unavailable during the call, the call continues in the parts of the routing that are still available.

Non-partial calls are calls that require the entire routing to be available at the start of the call and during the call. When during the call a part of the routing becomes unavailable, the call is aborted.

Note

Non-partial normal calls can only be started when the entire routing is available. BGM and emergency calls can be started when the entire routing is not available.

Note

BGM calls and emergency calls without live speech are started in the non available parts of the routing as soon as these parts are released.

Stacked calls are calls that have been recorded for later playback. This feature is only available in combination with a call stacker (see chapter 23).

Bosch Security Systems 2011-02

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Bosch Appliances 3.5 manual Calls, Call attributes
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3.5 specifications

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