System overview
1.8 EST3 Installation and Service Manual
Network Audio Riser
Network Data Riser
Equipment Enclosure
Local Rail Bus
Central
Processor
Module
Backup
Amplifier
Zoned
Amplifier
Zoned
Amplifier
Zoned
Amplifier
Zoned
Amplifier
AlertEVACPagePage
Figure 1-4: Normal amplifier operation
Possible fault condition Amplifier operation
Amplifier loses communication
with Central Processor module
If the panel is configured for stand-alone operation, the amplifier
automatically switches to the EVAC channel and outputs its 1
kHz temporal tone when the panel detects an alarm.
If the panel is not configured for stand-alone operation, the
amplifier will not output any signal.
Panel loses communication
with network data riser
Amplifier switches to the EVAC channel only in response to the
local panel’s programming uses the default EVAC message.
Panel loses communication
with network audio riser
Amplifier switches to the EVAC channel in response to the
system programming. For EVAC the amplifier uses its 1 kHz
temporal tone. For Alert the amplifier uses its 1 kHz 20 bps tone.
Backup amplifiers
In the event of an amplifier failure (not a field wiring problem),
the backup amplifier automatically replaces the failed amplifier,
as shown in Figure 1-5.