User's Manual

Airbus Iridium SATCOM System
165E5733-00 L-3 Aviation Recorders Proprietary
Issue, Rev. 02
21 January 2014
Page 50
Figure 6-7 – Discrete Input Interfaces
6.11 Discrete Outputs
The Airbus Iridium SATCOM System has 8 configurable Discrete Outputs, each of which is software-
configurable for Active High or Active Low logic and the assigned function. The Discrete Outputs use
‘Open-Closed’ signal levels, where the output is either high-impedance to ground (Open) or low-
impedance to ground (Closed).
Once a function (except “None”) is selected for any given output, it is no longer available for
assignment to any of the other outputs.
6.12 SATCOM
This section describes the interface and integration requirements for the Airbus Iridium SATCOM
System with an Audio Integrating System.
6.12.1 Audio Integrating System
Extension 1 is generally intended to be connected to the aircraft’s audio integrating system for flight
crew use. The interfaces required to fully support this functionality vary significantly depending on the
design of the audio integrating system. Generally, the MCDUs are used for control and display of the
SATCOM functions for Extension 1.
6.12.1.1 Audio Discrete Signals
There is one discrete input and one discrete output that can be used to support the integrated audio
interface.