VAR8 and Variants Operation, Commissioning, Fault Finding, and Maintenance Guide -
Is
Page 29 of 166
sue: 02 complete, approved
8.1.2 8x8 ACU Network Topology
The Intellevac Network’s 8x8 Audio Control Unit supports the following Slave Units:
• Wall mount Intellevac Distributed Amplifier Units, both legacy 4x4 DAUs and 8x8 DAUs.
• Rack mount VAR12 and VAR20 Routers, using the VAR Network Interface Adapter (VAR-NIA).
• Rack mount VAR8 Routers fitted with ANIC Network Interface Card.
The Audio Control Unit normally ‘talks’ out of its UPSTREAM port, which is connected to the
DOWNSTREAM port of the first Slave Unit in the chain. The UPSTREAM port of that Slave Unit is then
connected to the DOWNSTREAM port of the following system until a complete ‘ring’ is implemented back to
the Audio Control Unit.
The first Slave Unit is allocated a Slave-ID of 1, the next unit has Slave-ID 2 etc. The Slave-ID corresponds
to the Slave Unit’s physical position in the network.
Figure 4 shows the scheme of an Intellevac Network hosted by an 8x8 Audio Control Unit in which the
different types of Slaves Units are interconnected.
8.1.2.1 System Parameters
• Number of Slave Units: up to 30 units (120 network zones)
• Maximum distance between nodes: 1 km
• Network Control Response Time (Fire Alarm trigger to DVA initiation): <1 second
8.1.2.2 Main Network Features
• Slave Units can be any combination of: Intellevac 4x4 DAUs; Intellevac 8x8 DAUs; VAR8 Routers fitted
with an ANIC Network Interface Card; and VAR12/20 Routers using a VAR-NIA interface unit.
• Slave-IDs must correspond to the Slave Unit’s physical position in the network.
• Not all Slave Unit Outputs have to be Network Outputs.
− On legacy 4x4 DAUs, all outputs need to be Network Outputs.
• Network Outputs do not have to be numbered in the same order as the Slave Ids and Slave Outputs, nor
do they have to be contiguous (i.e. there can be gaps).
− On legacy 4x4 DAUs, Network Outputs are numbered based on its Slave Id and they do need to be
contiguous.
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