EST EST3X - Network Audio Riser Source

Chapter 4: Supplementary applications
EST3X Technical Reference Manual 81
No.
Control/Indicator Description
3
Paging Volume LED indicates the audio level of the person speaking into the
microphone.
4
Ready To Page LED flashes during preannouncement tone and is steady when
ready to page.
5
All Call Pressing the All Call button temporarily transfers all amplifiers to
the Page channel while the page is active. The All Call command
distributes the page signal to every amplifier in the system.
Pressing the button a second time exits the All Call mode. The
LED indicates when in the All Call mode.
6
Page To Evac Pressing the Page to Evac
button temporarily transfers the Page
signal to all amplifiers actively connected to the EVAC channel.
All EVAC amplifiers then receive and distribute the Page signal.
Pressing the button a second time exits the Page to Evac mode.
The LED indicates when in the Page to Evac mode.
7
Page To Alert Pressing the Page to Alert button temporarily transfers the Page
signal to all amplifiers actively connected to the Alert channel. All
Alert amplifiers then receive and distribute the page signal.
Pressing the button a second time exits the Page
To Alert mode.
The LED indicates when in the Page to Alert mode.
8
All Call Minus
Pressing the All Call Minus button temporarily transfers the page
signal to all amplifiers except those connected to the EVAC and
Alert channels. Pressing the button a second time exits the All
Call Minus mode. The LED indicates when in the All Call Minus
mode.
Network audio riser source
The EAEC Emergency Audio Evacuation Controller Card is the source of the
network audio riser. Available audio sources are local and remote voice page
functions. An integral tone generator database is provided for the EVAC, Alert,
and other functions. Alternately, the EAEC integral digital voice message
playback unit can simultaneously provide multiple prerecorded messages that
may be assigned to any channel.
The network audio riser consists of a single pair (Class B) or two pairs (Class A)
of wires connect all amplifiers together. The multiplexer within the EAEC converts
and compresses the real time audio signal and converts it to a digital format. The
output of the digital message playback unit and the integral tone generator
database is already in the digital format. The eight signal sources in digital format
are then combined together as selected by the system designer using a
multiplexer. All command and control signals for the audio system are distributed
over the network data riser.