L3 Aviation Products SDU L-3 Quick Start Manual
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Airbus Iridium SATCOM System165E5733-00 L-3 Aviation Recorders ProprietaryIssue, Rev. 0221 January 2014Page 51Mic On InputThe ‘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 activestate. 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 theinactive state, the call will be terminated. For outgoing calls when the ‘Mic On’ input isconfigured for ‘Latched ACP’, the function is dependent on which control source is configuredfor Extension 1. When an MCDU is the Extension 1 dialing control, setting the ‘Mic On’ input tothe active state will initiate the dialing process using the phone number preselected on theMCDU.Call Light OutputThe ‘Call Light’ output is software configurable for either steady or flashing lights. When anincoming voice call is ringing, the ‘Call Light’ output will transition to the active state; either in asteady state or flashing at approximately a 1 Hz rate. When the incoming call is subsequentlyanswered, the ‘Call Light’ output will remain active in the steady state as long as the call is inprogress. When the call in progress is terminated, the ‘Call Light’ output will go inactive.6.12.1.2 Latched ACP ConfigurationIf 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, thecall will be answered and microphone audio will always be live. The SATCOM switch on the AudioControl Panel is pressed a second time to end the call. Calls cannot be answered and terminated onthe MCDU screen in this configuration.The following diagram also shows how the Call Light output can be interfaced to an Audio IntegratingSystem that provides SATCOM visual and aural call indications. In this case, a Call Light, Chime andChime Reset switch are not required. See Figure 6-8.Figure 6-8 – Latched ACP Audio Interface |
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