Bosch PRAESENSA, Installation Manual

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32 en | General installation procedures and instructions PRAESENSA
2019.11 | V1.00 | Installation manual Bosch Security Systems B.V.
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– Multicast is used for one‑to‑many transmission with just one sender and multiple
receivers. Multicast differs from broadcast in that packets are sent only to the devices
and ports that are interested in the data. This means that multicast traffic can make much
more efficient use of available network bandwidth, but may also require the use of IGMP
for management. Without IGMP, multicast traffic behaves as broadcast traffic.
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Although OMNEO supports unicast and multicast for audio streams, PRAESENSA uses
multicast transmission for all dynamic OMNEO audio channels. An audio stream of a call
station can be received by multiple amplifiers to play out in connected zones. Even during an
announcement it is possible to add zones to that call by subscribing the appropriate amplifiers
to the already existing multicast stream.
Exchange of control information is done one‑to‑one and uses a unicast transmission link.
Dante audio streams can be configured as unicast or multicast stream, depending on the
number of receivers (destinations).