Bosch PRAESENSA, Installation Manual

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PRAESENSA System controller | PRA-SCL/SCM/SCS | en 53
Bosch Security Systems B.V. Installation manual 2019.11 | V1.00 |
7 System controller | PRA-SCL/SCM/SCS
7.1 Introduction
The system controller manages all system related functions in a PRAESENSA Public Address
and Voice Alarm system. It routes all audio connections between network-connected
PRAESENSA audio sources and destinations. It supervises and plays back messages and tones,
stored on its flash memory, either scheduled or manually started from a call station or PC. It
manages the routing of background music streams, along with business calls and emergency
calls, all based on priority level and zone occupancy. It collects all status information of
connected system devices, manages the event logs and reports faults.
The system controller is network‑connected via OMNEO and DC‑powered from a multifunction
power supply with integrated battery backup, accommodating both centralized and
decentralized system topologies. Connections to other devices in the system are made using
the built‑in 5‑port switch, supporting RSTP. The built‑in web server allows for system
configuration using a browser.
7.2 Functions
System control and audio routing
– Capability to control a system with up to 250 devices, serving more than 500 zones.
– Native support for switched single‑subnet networks, with add‑on support for routed
multi‑subnet topologies.*
– Dynamic allocation of multiple and simultaneous audio channels to save on network
bandwidth; audio connections are created when a call or a message is broadcast, and
freed up immediately afterwards.
– Secure interconnections using Advanced Encryption Standard (AES128) for audio data
and Transport Layer Security (TLS) for control data.
– Receiver for Dante or AES67 audio channels from external sources, with dynamic
re‑routing to open or secure OMNEO channels.
– Internal storage capacity for messages and tones; up to eight messages can be played
back simultaneously.
– Recording facility on SD‑card for emergency audio logging and call stacking. The
integrated call stacker automatically forwards recorded calls to previously occupied
zones.*
– Internal real time clock for scheduled events and event time stamping; support for
Network Time Protocol (NTP) with automatic adjustment for Daylight Saving Time (DST).
– Internal system event and fault event log.
– Networked control interface for third party applications.
– Built‑in webserver for configuration and file management using a browser.