Installation guide

VAR4 / VAR12 / VAR20 - Product Description
2.1 System Context
The diagram in Figure 2 shows the VAR Router in system context. A number of audio inputs feed the VAR
Router. Typically, these include ASL DMS-series paging microphone stations, ASL FMS-series Emergency
Fireman’s microphones (All-Call or Zoneable) and various background music sources. The function of the
VAR Router is to connect these sources, as required to a number of audio outputs, which, in turn, feed
power amplifiers and loudspeakers.
Additionally the VAR Router contains Digital Voice Announcers (DVAs). These are controlled by the Fire
Alarm Panel to broadcast Alert or Evacuate messages to the building.
Figure 3 shows an example of VAR12 and VAR20 Routers connected to an Intellevac Network via a
VAR-NIA Network Interface Adapter. The Audio Control Unit in this example is a wall mount Intellevac ACU.
Figure 2 VAR Router in System Context
OUTPUT 1
AB
ABAB
OUTPUT n
FMS10
FIRE MICROPHONE
BACKGROUND MUSIC
VAR
ROUTER
V400
AMPLIFIER MAINFRAME
SPEAKER CIRCUITS
A
B
BMB01
REMOTE I/O UNIT
AMBIENT NOISE SENSOR
PROGRAMME SELECTOR
VOLUME CONTROL
FIRE
ALARM
PANEL
V400
AMPLIFIER MAINFRAME
SPEAKER CIRCUITS
A
B
DMS10
PAGING MICROPHONE
BACKGROUND MUSIC
DMS20
PAGING MICROPHONE
Issue: 03 complete, approved
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