Chapter 4: Supplementary applications
P/N 3101890-EN • REV 006 • ISS 21JUN18 63
Digital audio riser source
The control panel supports up to three ACHS Audio Channel Selector cards that convert digital audio from an
EAEC card into an analog preamp signal. The audio riser consists of a single pair (Class B) or two pairs (Class A)
of wires that connect together all SIGA-AA30/50 amplifiers housed in a separate cabinet.
Audio signal priority
During system configuration, each of the four available audio channels is assigned one of the four available types
listed in Table 22. The Page and Auxiliary types may only be assigned to a single channel.
Table 22: Network audio channel types and priorities
Priority
1
VAC 2
3
4
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.
Paging channel
Paging is a manual function. An operator is required to select a destination for the page, and then make an
announcement. The Page channel is never automatically selected by the VM-1 system.
The page channel always carries a live page signal, regardless of its source. There are three sources that can
supply the paging signal: the local paging microphone, the firefighter telephone, and the remote microphone.
These sources are automatically prioritized as shown in Table 23.
Table 23: Page priorities
Page signal source
Local microphone
Firefighter telephone
Remote microphone
The page command is a non-latching function. When the page command ends, amplifiers automatically switch
back to the source channel that was active (if any) prior to the page command.
VM-PMI special page modes
There are five types of page commands available on the network:
• All Call
• EVAC
• Alert
• All Call Minus
• Selective Page
To Next Page
Loading...
Need help?
General
