User's Manual

Airbus Iridium SATCOM System
165E5733-00 L-3 Aviation Recorders Proprietary
Issue, Rev. 02
21 January 2014
Page 51
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.
Call Light Output
The ‘Call Light’ output is software configurable for either steady or flashing lights. When an
incoming voice call is ringing, the ‘Call Light’ output will transition to the active state; either in a
steady state or flashing at approximately a 1 Hz rate. When the incoming call is subsequently
answered, the ‘Call Light’ output will remain active in the steady state as long as the call is in
progress. When the call in progress is terminated, the ‘Call Light’ output will go inactive.
6.12.1.2 Latched ACP Configuration
If the Audio Integrating System provides a latched Mic On output, the following interface can be used.
When an incoming call is ringing and the SATCOM switch on the Audio Control Panel is pressed, the
call will be answered and microphone audio will always be live. The SATCOM switch on the Audio
Control Panel is pressed a second time to end the call. Calls cannot be answered and terminated on
the MCDU screen in this configuration.
The following diagram also shows how the Call Light output can be interfaced to an Audio Integrating
System that provides SATCOM visual and aural call indications. In this case, a Call Light, Chime and
Chime Reset switch are not required. See Figure 6-8.
Figure 6-8 – Latched ACP Audio Interface