Known Limitations; Firmware Upload To Call Station Fails; Dante Connections; Dante Multicast - Bosch PRAESENSA Release Notes

PRAESENSA
6

Known limitations

System functions that are implemented but with limitations. In some cases workarounds are
given.
6.1

Firmware upload to call station fails

The MTU (Maximum Transmission Unit) of the call stations is 1468. When the MTU of the PC
network adapter that is used is set to a lower value than 1472 (1468 + 4), the data packets are
split across different frames; the FWUT (Firmware Upload Tool) cannot handle this and will
disconnect.
Check the actual MTU value of the network adapter by opening a cmd‑window (with
administrator rights) and enter:
netsh interface ipv4 show subinterface
If the MTU value is too low, it can be increased temporarily to a higher value by entering:
netsh interface ipv4 set subinterface
"<name of interface>" mtu=1500
store=persistent
Then try again.
6.2

Dante connections

Some Dante devices do not automatically re‑establish their connection with the system
controller after a reboot of the system controller. Re‑establish the connection via Dante
controller or use a Dante device that supports automatic reconnection.
6.3

Dante multicast

Only use Dante unicast streams between a Dante device and the system controller to prevent
multicast addressing conflicts, that can result in audio distortion or not being able to setup a
call.
6.4

Scheduled calls

If a scheduled call is activated by a button of a call station extension, the scheduled time
intervals are ignored and the call starts immediately. Scheduled calls can only be started from
a control input.
6.5

Load measurement

When a load measurement on an amplifier channel is done with a shorted loudspeaker line,
the web page will indicate: "Not measured". Remove the short circuit and redo the load
measurement.
6.6

Firmware upgrade

Before using the firmware upgrade tool, make sure the released PRAESENSA firmware files
have been installed also.
In some rare cases the upgrade of a device will not be successful in the first attempt. If this
occurs please retry for the device for which it failed.
6.7

Call station reset to factory default

A new Call station (PRA-CSLD or PRA-CSLW) out of factory first needs a firmware update
before it can be reset to the factory default settings.
Bosch Security Systems B.V.
Release notes
Known limitations | en 15
2023-05 | V1.81 |