PRAESENSA
Application notes | en
175
Bosch Security Systems B.V.
Installation manual
2019.11 | V1.00 |
–
Some extenders provide a PoE point-to-point solution of up to 800
m with no mid-cable
equipment and no far-end power source, but only for 100BASE‑T Ethernet. As an
exception to the rule that 1000BASE‑T is needed, this may be used for edge devices only,
such as a single call station without loop-through connection to other PRAESENSA
devices. The maximum number of (multicast) OMNEO audio channels must be kept below
20 in order not to exceed the available network bandwidth. See section
for more information.
http://www.veracityglobal.com/
).
There are also Ethernet bridges on the market that can cover even longer distances and use
CAT, coax or telephone wiring. Although they may have Gigabit Ethernet connections on the
end-devices, they do not use 1000BASE‑T Ethernet on the long distance interconnections but
other (slower) communication links like VDSL. Do
not
use these kind of range extenders for
PRAESENSA because they have too much packet arrival jitter and do not support PTP for
synchronization of audio devices! For the same reason Wi-Fi or other wireless interfaces
cannot be used.
17.3
Compatibility with other network data
Devices that use OMNEO/Dante/AES67 should never be used with active CobraNet devices on
the same network to avoid disturbance of clocking data. If this is not possible, then use an
additional VLAN to keep CobraNet devices separated.
Make sure jumbo frames are not present on the network, because jumbo frames will increase
the packet jitter to an unacceptable level. One packet in a jumbo frame can contain up to
9000
bytes which blocks the network too long for other traffic.
17.4
Static IP-binding
Many applications and devices support making connections via hostnames, so they don’t need
a fixed or static IP‑address to establish a connection. Using hostnames is easier to configure
and maintain because it avoids IP‑address conflicts and makes hardware replacements more
easy. However some applications do not (yet) support hostnames, they need an IP‑address to
setup a connection.
Notice!
The Bosch modular fire panel FPA‑5000 is able to control the PRAESENSA system via the
Open Interface of the PRAESENSA system controller. This connection is called the Smart
Safety Link and it creates an interface between the fire detection system and the voice alarm
system. However, the FPA‑5000 only supports a static IP‑address to establish a connection
and the PRAESENSA system controller does not support the configuration of a static
IP‑address. Solving this problem requires a function called static IP‑binding.
Configuring a static IP‑address in the system controller is not supported. It is not possible to
use the Link Local address of the system controller or an address assigned by a DHCP‑server
because this address may change after a power cycle or reset. Even when the Ethernet switch
with the DHCP‑server is able to create a pool of only one IP‑address that would always be
given to the device connected to a certain port of the switch, this solution would be useless,
because the PRAESENSA system controller has two MAC‑addresses.
The solution is to use a switch, such as the PRA-ES8P2S, that has a DHCP‑server that supports
static IP‑binding to a MAC‑address.
Summary of Contents for PRAESENSA
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