Bosch DICENTIS Hardware Installation Manual page 11

DICENTIS
An ARNI (Audio Routed Network Interface) is used to increase the number of DICENTIS
devices on a single subnet and to connect multiple DICENTIS system subnets. If more than
one subnet is required, two types of an ARNI must be used.
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Defining subnets and subnet masks
A subnet is a logical, visible subdivision of an IP network. The number of DICENTIS devices
that can be in the same subnet depends on the subnet mask.
A standard class C subnet (255.255.255 or /24) can contain 254 IP addresses. Some
DICENTIS devices have 2 IP addresses. For this reason, Bosch advises to use 255.255.252.0
(or /22) as a subnet mask. This allows you to have 1018 IP addresses. The following table lists
the number of IP address per DICENTIS device in a DICENTIS Conference System.
Device
DICENTIS server (optional Meeting Application)
Client PC running DICENTIS meeting application
DICENTIS Audio Powering Switch
DICENTIS Powering Switch
DICENTIS multimedia device
DICENTIS discussion device
DICENTIS discussion device select language
DICENTIS discussion device voting
DICENTIS discussion device extended
ARNI‑Enterprise
ARNI‑Standard
IP camera
SDI video switcher
Table 3.2: Nodes count of DICENTIS equipment
Maximum number of DICENTIS devices in a string:
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Bosch Security Systems B.V.
OMN-ARNIS (ARNI‑S OMNEO interface): The ARNI‑S is required for increasing the system
size above 100 DICENTIS devices. It supports up to 450 DICENTIS nodes in its subnet. It
also acts as a DHCP server in its subnet.
OMN-ARNI‑E (ARNI‑E OMNEO interface): The ARNI‑E is required for increasing the system
size above 450 DICENTIS nodes. It supports up to 450 DICENTIS nodes in its subnet. It
also acts as a DHCP server in its subnet. It can connect up to 40 subnets, each with an
ARNI‑S.
The max age timer should be set to 22 when RSTP is used for cable redundancy to
prevent a defective cable or powering switch from influencing the system.
Each time data hops from one switch to another, the age is increased by one. This timer
can be reached or exceeded, because a daisy chain can be used to loop through the
DICENTIS devices.
Hardware Installation Manual
System installation overview | en
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