System overview
1.14 EST3 Installation and Service Manual
page, auxiliary and four general audio channels all receive the
page signal. Any amplifier connected to the page, auxiliary or
general audio channels will receive the page. The EVAC and
alert channels are connected to their respective signal sources, as
in the normal mode.
Automatic messaging
One of the features of the 3-ASU Audio Source Unit is the
method used to monitor the integrity of the digital audio system.
When an audio messaging system is configured, default audio
messages are recorded for the Evacuation and Alert channels.
The text of default messages should be generic in nature, and
should not include location-specific instructions. When the
system is in the normal condition, the 3-ASU continuously
transmits default messages over the network audio riser. The
zone amplifiers use the default messages to verify their
operational integrity, as well as the integrity of the riser wiring.
When an alarm is detected, the evacuation and alert message
channels are selected by the amplifiers in the appropriate areas in
the facility, as directed by the system rules. If a specific
evacuation message has been programmed to play in response to
the alarm, it is sent out over the evacuation channel. Location
specific evacuation messages contain information and
instructions that should only be used for a specific alarm
location. Should a second alarm from another location be
received, the evacuation message playing as a result of the first
alarm may not be appropriate for the second alarm.
Note: In the event of conflicting messaging instructions caused
by multiple alarm events, the system will play the default
evacuation message, whenever two or more different messages
are requested at the same time on the evacuation channel.
Automatic message processing is illustrated in Figure 1-9. By
reverting back to the generic default evacuation message in
multiple alarm location scenarios, no one can be misdirected by
the wrong message. Default messages also play during alarms
when no location specific message has been requested.
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