Chapter 4: Supplementary applications
EST3X Technical Reference Manual 85
and Auxiliary types may only be assigned to a single channel. The General type
may be assigned to up to four channels.
Table 21: Network audio channel parameters
Priority
1
2
3
4
5
Each channel type has a priority level associated with it. When more than one
channel is commanded to source a given amplifier, the amplifier will connect to
the source having the highest priority. The Page channel will only go active when
the microphone PTT button is pressed.
3X-PMI special page modes
There are five types of page modes available on the network:
• All Call
• EVAC
• Alert
• All Call Minus
• Selective Page
The first four modes are available by pressing a single button on the front of the
3X-PMI. These functions are most commonly used in an emergency situation.
The page buttons provide instantaneous switching of the page signal to the most
frequently contacted areas of the building. The special page modes do not
require any source switching by zoned audio amplifiers. When a special page
switch is activated, the signal content of the eight outgoing audio channels is
modified. Figure 16 on page 86 illustrates this principle.
In the normal page mode, the audio signal sources are each connected to a
separate audio channel, as represented by a at the intersection of the signal
source and the audio channel, shown at the lower left of Figure 16. Each audio
channel is represented as a vertical line in this figure. The eight audio channels
are actually multiplexed together and distributed over a common pair of wires
called the network audio riser. The figure shows the system in the normal page
mode, with the zoned audio amplifiers processing EVAC signals on the 1st and
3rd levels, and a page signal on the 2nd level.
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