Digital Voice Announcers; Music Input; Mute Input; Audio Outputs - ASL INTERCOM VAR8 Product Description

2.1.2

Digital Voice Announcers

Each VAR8 provides four DVA Messages of the following capacity:
•
DVA#1 and DVA#2: 66-second message length
•
DVA#3 and DVA#4: 50-second message length
The DVAs may be configured so that they either stop immediately, terminating even if they are part way
through a message, or they can be configured to play the message to the end and then stop.
A common application of the DVAs is to be controlled by Fire Alarm contact Inputs. Two methods of
operation are supported:
•
Latching: the trigger is latched by the Router. This requires a separate reset input from the Fire Panel to
terminate the route.
•
Non-Latching: a reset signal is not required. The route is terminated when the trigger ends.
Operation is described in detail in Section
The DVAs may be also routed by the Permanent Route mechanism described in Section
Routes".
2.1.3

Music Input

The Router provides one unbalanced input, which is typically used for background music. Note that any of
the balanced audio inputs may be used for background music when more music inputs are required.
2.1.4

Mute Input

The Router provides a special 'Mute' Input, which mutes even fire microphones if needed. For this purpose
its priority is set to '0' by default. However, the mute input is configurable, so it is possible to mute just DVAs,
and/or any other inputs.
2.2

Audio Outputs

The Base VAR8 variant or this Router provides eight electronically balanced outputs for connection to
external amplifiers. These are on two RJ45 connectors, and are single (non A+B) outputs.
Each of these outputs is also provided as separate A and B output connections on the EXP8 Interface
Expansion Board. These connections are on screw in terminals.
The output is hard-limited to +2.5 dBu. The outgoing surveillance tone is not limited in this way. Thus if the
audio is overdriven, the surveillance tone is not clipped.
The outputs are normally fed from the DSP and all processing is performed in the digital domain. Each
output, is however equipped with an 'override gain' setting. This enables independent adjustment, for each
zone, of the level of the Fire Microphones when the Router is in the hardware bypass mode. These analogue
gain settings are non-volatile and retained even after power failure and/or processor failure.
VAR8 and Variants - Product Description
"2.6.1.2 Contact
Issue: 02 complete, approved
Page 13 of 54
Functions".
"2.6.2 Permanent