Chapter 4: Supplementary applications
64 P/N 3101890-EN • REV 006 • ISS 21JUN18
The first four modes are available by pressing a single button on the front of the VM-PMI. These are the paging
functions 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
page switch is activated, the signal content of the four outgoing audio channels is modified. Figure 16 on page 65
illustrates this principle.
In the normal page mode, the audio signal sources are each connected to a separate audio channel, as
represented by a ν 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 four 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 an EVAC signal on the first floor,
a page signal on the second floor, and an Alert signal on the third floor.
The Selective Page is issued by pressing a display-indicator button that is assigned to selected audio zones. The
action temporarily transfers the selected amplifiers to the page channel while the page is active, distributing the
page signal only to selected audio zones.
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