Northern Airborne Technology AMU50-001 - Manual (Page 20)

AMU50-001 Audio Management Unit
SM76 Installation and Operation Manual
Section 2 Rev: 1.04
Issue 1 Page 2-8
ENG-FORM: 805-0120.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.4.4.8 Interconnect Audio
2.4.4.8.1 Receive Audio Inputs
The Receive Audio levels and access to Receive Audio inputs from ACPs are configured using the
DevCs application.
These inputs are fully operational with the AMU50 configured in Normal and Backup modes. Only
transceivers 1 and 2 and receivers 1 and 2 are operational in Emergency mode.
2.4.4.8.2 Direct Audio Inputs (DIR 1 RX thru DIR 6 RX)
The Direct Audio Inputs should be used for aircraft audio warnings. The Direct Audio levels and which
user headsets include Direct Audio are configured using the DevCs application. If the ICS tie line is set to
analog, the Direct 6 audio input is disabled.
These inputs are fully operational with the AMU50 configured in Normal and Backup modes. Only Direct
Inputs 1, 2 and 3 are operational in Emergency mode.
2.4.4.8.3 Composite Audio output
The Composite Audio output (with two preset levels) is a summation of selected audio inputs. It is
configured using the DevCs application.
This output is operational with the AMU50 configured in Normal and Backup modes only.
2.4.4.8.4 ICS Tieline
The AMU50 can support ICS communications with an external device on either an analog tieline or a
digital tieline, but not both. The analog/digital setting is configured using the DevCs application.
When the tieline is configured as analog, the tieline loading must be equivalent to 1000 Ohms. The tieline
must be set to ANALOG mode when connecting multiple AMU50 units together. See the Interconnect in
section 2.7 for example loading connections.
This output is operational with the AMU50 configured in Normal and Backup modes only.
2.4.4.8.5 Music Inputs (MUSIC RIGHT/LEFT RX)
The preset music input audio gain level, and the ability for each user to access music, is configured using
the DevCs application.
These inputs are operational with the AMU50 configured in Normal or Back-up modes only.
2.4.4.8.6 Cockpit Voice Recorder Outputs (CVR1/CVR2)
The CVR1 output consists of Phones and continuous live mic Audio from User 1. The CVR2 output
consists of Phones and continuous live mic Audio from User 2.
These outputs are operational with the AMU50 configured in all modes.