User's Manual Part 1

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.
– 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.
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
IP addresses
DICENTIS server (optional Meeting Application) 1
Client PC running DICENTIS meeting application 1
DICENTIS Audio Powering Switch 1
DICENTIS Powering Switch 1
DICENTIS multimedia device 2
DICENTIS discussion device 1
DICENTIS discussion device select language 1
DICENTIS discussion device voting 1
DICENTIS discussion device extended 2
ARNI‑Enterprise 1
ARNI‑Standard 1
IP camera 1
SDI video switcher 1
Table 3.2: Nodes count of DICENTIS equipment
Maximum number of DICENTIS devices in a string:
– 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.
DICENTIS
System installation overview | en 11
Bosch Security Systems B.V. Hardware Installation Manual 2016.07 | V1.4 |