EST EST3X - Audio signal priority

Chapter 4: Supplementary applications
84 EST3X Technical Reference Manual
Figure 15: Single amplifier failure
(2)
(3)
(1)
(4)
(6) (5)
(5)
(7)(8)
SFS1-CPU
(1) Network data riser
(
2) Network audio riser
(3) Equipment enclosure
(4) Local rail bus
(5) Zoned amplifier
(6) Backup amplifier
(7) Alert
(8) EVAC
Table 20: Amplifier fault conditions
Possible fault condition
Amplifier operation
Amplifier loses communication
with
CPU
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.
Audio signal priority
During system configuration, each of the eight available audio channels is
assigned one of the five available types listed in Table 21 on page 85. The Page,