16 en | Known limitations PRAESENSA
2023-05 | V1.81 |
Release notes
Bosch Security Systems B.V.
6.8 Enable Network Time Protocol (NTP)
NTP is configured on the “Time settings” page. Enable “Set time automatically (NTP)” and
press submit. Wait for the reboot system page; this will take a few seconds. Press “System
reboot” to activate NTP. If you navigate away to another configuration page too early and don’t
wait for the reboot system page, a non-responsive web page will show "Loading" and NTP will
remain disabled.
6.9 Audio missing on systems with multiple subnets
In systems with multiple subnets, live paging from a Call station is possible without chimes,
recorded messages and Dante audio channels from the system controller.
To solve the problem of missing audio signals, update the system to software version 1.50 and
perform a factory reset of the system controller, in that order.
Before doing a factory reset of the system controller hardware, make sure you do a backup so
that your configuration can be restored afterwards.
Note that recorded messages are not part of the backup configuration .tar.gz file. Make sure to
save them so that they can be uploaded again after restoring the configuration file.
6.10 Dante audio outputs
A system with System controller redundancy does not support secure Dante 4‑digit PIN
(Personal Identification Number) on the Dante audio outputs.
You might want to use Dante audio outputs to interface with 3
rd
party devices like amplifiers or
devices for recording purposes. When control is switched from duty system controller to
redundant System controller, the transmit of the Dante output channels of the duty system
controller is moved to the redundant System controller in order to make the Dante audio
outputs redundant.
The persistent Dante audio channels cannot be authenticated and not encrypted, so they form
a security risk, as no precautions are taken against malicious or accidental attacks via their
network interfaces. For highest security, these Dante output channels in combination with
System controller redundancy must not be used as part of the PRAESENSA system.
6.11 Multiple redundant System controllers
Release 1.10 and 1.20 are tested with one duty and one redundant System controller. There is
no built‑in limit, and it is possible to add multiple redundant System controllers. A system
setup with more than one redundant System controller was not tested and proper operation
cannot be confirmed.
6.12 DHCP server
When the DHCP server is not available when the system starts it can happen that some
devices do not receive an DHCP IP‑address and will remain in link‑local. The consequence is
that these devices do not connect to the System Controller. If the System Controller does not
receive a DHCP IP‑address it cannot connect to the system devices. It is strongly
recommended to have the DHCP server available when the system starts.
6.13 Sticky faults
Sticky faults might occur in a system with a Cisco IE-5000-12S12P-10G switch. Take a new
network snapshot to solve it.
This might happen after a restart of an ARNI device or of the Cisco switch itself.
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