124 en | Functionality PRAESENSA
2021.12.21 | V0.15b | F.01U.402.882
Underwriters Laboratories Listing Document (ULLD)
Bosch Security Systems B.V.
5 Functionality
This section addresses the intended function of each PRAESENSA product individually. See
also the sections:
Operation, page 123
and
Programming settings, page 132
.
5.1 System controller | PRA-SCL
5.1.1 Functions
System control and audio routing
– Capability to control a system with up to 150 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.
Supervision
– Supervision of stored messages and tones.
– Supervision of data integrity of site specific data.
– Internal watchdog timers to detect and recover from processing errors.
– Faults or problems of all system devices are collected, reported and logged.
Fault tolerance
– Two system controllers can be configured as a redundant pair.
– Five OMNEO network connection ports, supporting redundant network connections.
– Dual DC‑inputs with polarity reversal protection.
* Availability to be announced.
5.2 Amplifier, 600W 4/8-channel | PRA-AD604 | PRA-AD608
5.2.1 Functions
Efficient 4/8‑channel power amplifier
– Transformerless, galvanically isolated, 70/100V outputs.
– Flexible partitioning of the available output power across all amplifier channels.
Flexibility in loudspeaker topologies
– Two outputs on every amplifier channel to support redundant loudspeaker wiring
topologies.
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