Northern Airborne Technology AMU50-001 - Manual (Page 17)

AMU50-001 Audio Management Unit
SM76 Installation and Operation Manual
Section 2 Rev: 1.04
Issue 1 Page 2-5
ENG-FORM: 805-0120.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.4.4.5 Aural Alerts
The AMU50 can provide up to eight supplemental aural alerts. Each aural alert consists of one or two
audio data files which are played consecutively. The priority, repetition, activation, enabled output, audio
level and audio data files for each Aural Alert can be configured using the DevCs application.
CAUTION:
These alerts must not be used for primary aircraft warnings; audio for primary
aircraft warnings should be generated externally to the AMU50 and connected
to the AMU50 direct audio inputs.
CAUTION:
Ensure that at least one valid WAV file is assigned to each alert that is
enabled. When an enabled alert is activated for which no valid WAV file has
been assigned, alert audio for all alerts will not be played correctly. The alert
playing function will recover when the alert input is de-activated.
CAUTION:
Do not assign the alert priority as “Highest (4)” for more than six alerts. If more
than six alerts with priority assigned as “Highest (4)” are activated
simultaneously, the system will not respond to ACP control inputs; audio will
continue to play corresponding to the last control settings. The system can be
selected to EMER mode using a Mode Control switch to permit emergency
mode functionality, or full system control can be re-established by reducing
the number of active alert inputs to six or below and de-selecting, then re-
selecting NORM mode using the ACP Mode Control switch.
2.4.4.6 Interconnect Inputs
2.4.4.6.1 Passenger Intercommunication System Volume (PAX VOL+/-)
The AMU50 has two Passenger ICS Volume Inputs for adjusting the ICS Audio Level for all users
assigned to the virtual ACP and the digital ICS tieline. The PAX VOL switch (if installed) should be
attached to the PAX VOL+ and PAX VOL- pins. Each activation of the PAX VOL switch causes one
volume level change of 2 dB: an increase for the positive pin and a decrease for the negative pin. The
Passenger power-up ICS Level Variable default value is configured using the DevCs application.
This input is operational with the AMU50 configured in Normal mode only.
2.4.4.6.2 Normal Call Input (NORM CALL IN)
When in ISO mode, if the Normal Call Input is activated, the AMU50 causes the call indicators on all
ACPs to flash, and sends a Normal Call tone to all headsets. The level of the Normal Call tone is
configured for each ACP using the DevCs application.
This input is operational with the AMU50 configured in Normal mode only.