Audio Input Priority And Override - ASL INTERCOM VAR8 Product Description

2.3

Audio Input Priority and Override

The input priority is used to resolve conflicts when two or more inputs try to broadcast to the same output. In
this case the input with the highest priority will be able to broadcast, and the others will not.
19 priority levels available, and can be assigned to any of the audio input sources.
Priority is assignable to each input per output. This is so that different inputs may have different priorities
according to which zone they are serving. For example a particular microphone may have a high priority only
in its local zone, and a lower priority when broadcasting elsewhere.
Assignment of equal priorities to different inputs means that those inputs operate on a 'first-come-first-
served' basis.
An override occurs when a higher priority input taker over control of an output broadcast from a lower priority
input.
Table 4 describes the actions in the event of override. The system supports up to 40 overrides per output.
Table 3 Override
Input Type
Fire Microphone
Zoneable Paging Microphone
Single Button Microphone
DVAs
Permanent Route
Latent Route
1. Care should be taken in ensuring that Fire Microphones, and Alarm and Emergency DVAs
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have a high priority and non-emergency sources, such as Paging Microphones and music
sources, have low priorities. This is to ensure that these emergency inputs can override
normal inputs.
2. In a networked system it is essential that:
a. The Slave Units are programmed so that they know the Priorities of the Audio Control
Unit's audio sources in order that priorities can be successfully arbitrated between their
local inputs and the audio inputs into the Audio Control Unit.
b. The Audio Control Units are programmed so that they know the Priorities of the Slave
Unit's audio sources, in order that priorities can be successfully arbitrated across the
networked system when the Audio Control Unit initiates a remote route.
VAR8 and Variants - Product Description
If Inputs 1 and 2 are assigned as Fire Microphones, they operate on a priority
basis (by default 1>2).
If 1 overrides 2 then 2 will be restored immediately that 1 has completed the
announcement.
When broadcasting to a group of zones the user may be overridden during paging
in any zones in which other users have higher priority. In this case, the original
broadcast will be able to continue to page the remaining zones.
If the override source is removed during the original announcements the
overridden zones will not be re-instated. This is to minimise the broadcast of
potentially ambiguous or annoying message fragments.
If a DVA is overridden it is silenced immediately in the zone(s) in which it is
overridden. When the override is removed it is re-instated immediately, i.e. does
not wait until the beginning of the cycle.
If overridden, the route is restored immediately the override is removed. A soft
fade-up may be desirable if background music is being overridden; this may be
readily programmed for the input being used for the music.
If overridden, the route is restored immediately the override is removed. A soft
fade-up may be desirable if background music is being overridden; this may be
readily programmed for any input that is being used for the music.
Issue: 02 complete, approved
Page 14 of 54
Action in Event of Override