Northern Airborne Technology AMU50-001 - Manual (Page 39)

AMU50-001 Audio Management Unit
Installation and Operation Manual
Section 3 Rev: 1.00
Issue 1 Page 3-3
ENG-FORM: 806-0113.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
3.3.7 Audio Muting
The AMU50 can be configured to mute Direct, Receive, and/or intercom audio when a user is transmitting
on a transceiver. The muting is configured on a per ACP basis using the DevCs.
Intercom, Radio (transceiver and receiver), Direct, and Aural Alert Audio will mute the Music audio. When
the action that caused the Music to mute has ended, the Music progressively returns to the previous level.
3.3.8 EMERG/BACKUP Indicator
An output is supplied to allow an external EMERG/BACKUP indicator to be installed. The indicator will
illuminate if the AMU50 is in Backup or Emergency mode.
3.3.9 Passenger Intercom
The AMU50 provides an audio accessory serial data port for connecting a passenger intercom device.
The Voice Operated ICS (VOX) level for the passengers not assigned to an ACP53 is set in the DACS
DevCs. The highest VOX level threshold acts as the keyed mode of operation and the VOX circuit shall
not gate the microphone audio. In this mode the MIC audio can only be gated using the ICS PTT input.
When the lowest VOX level is reached, the ICS shall still be gated but shall only require a small signal to
open the ICS channel.
3.3.10 Passenger ICS Volume
The AMU50 supports two Passenger ICS Volume Inputs for adjusting the passenger ICS Audio Level.
Activating the positive Passenger ICS Volume Pin increases the volume, and activating the negative
Passenger ICS Volume Pin decrease the volume.
The Passenger ICS Level Variable default value is configured using the DevCs application.
3.3.11 Winchman Select
The AMU50 supports three Winchman inputs to allow the winchman to be associated with ACP 1 through
ACP 3. If more than one Winchman Input is active, the winchman adopts the pre-programmed ACP
assignment.
3.3.12 NORM Call; High Priority Call; ISO Override
Support is provided for a Normal ICS Call input, a High Priority ICS Call input, and an Isolation Override
input. These Call inputs are used by passengers without an ACP to call the crew when they have been
isolated.
When the Isolation Override input becomes active, the Isolation Mode is temporarily suspended and the
passengers can communicate with the crew members.