L3 Technologies AFIRS228S User Manual
AFIRS 228S Iridium Global Communications System Installation Manual
16 July 2014
L-3 Aviation Recorders Proprietary
Page 47
165E5733-00 Rev. 03
6.10 Discrete Outputs
The 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).
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.
assignment to any of the other outputs.
6.11 SATCOM
This section describes the interface and integration requirements for the Iridium SATCOM System
with an Audio Integrating System.
with an Audio Integrating System.
6.11.1 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.
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.
6.11.1.1 Audio Discrete Signals
There is one discrete input and one discrete output that can be used to support the integrated audio
interface.
interface.
Mic On Input
The Mic On function is dedicated as a Latched ACP mode; therefore, Voice Extension 1
(Mic/Phone input) will answer an incoming call when the Mic On input transitions to the active
state. Once a call is in progress, the microphone audio channel will function as long as the Mic
On input is in the active state. If a call is in progress and the Mic On input toggles to the
inactive state, the call will be terminated. For outgoing calls when the Mic On input is
configured for Latched ACP, the function is dependent on which control source is configured
for Extension 1. When an MCDU is the Extension 1 dialing control, setting the “Mic On” input
to the active state will initiate the dialing process using the phone number preselected on the
MCDU.
(Mic/Phone input) will answer an incoming call when the Mic On input transitions to the active
state. Once a call is in progress, the microphone audio channel will function as long as the Mic
On input is in the active state. If a call is in progress and the Mic On input toggles to the
inactive state, the call will be terminated. For outgoing calls when the Mic On input is
configured for Latched ACP, the function is dependent on which control source is configured
for Extension 1. When an MCDU is the Extension 1 dialing control, setting the “Mic On” input
to the active state will initiate the dialing process using the phone number preselected on the
MCDU.
Call Light Output
The Call List Output is Software configurable for either steady or flashing lights.
•
Incoming Call is Ringing = Call Light output will transition to the active state, either in a
steady state or flashing at approximately a 1 Hz rate.
steady state or flashing at approximately a 1 Hz rate.
•
Call is Answered = Call Light output remains active in the steady state as long as the
call is in progress.
call is in progress.
•
Call is Terminated = Call Light output will go inactive.