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190-01007-A3 GTN 6XX/7XX AML STC Installation Manual
Rev. 4 Page 5-59
5.5.4.8 GMA 35 Audio Panel Configuration (GTN 7XX Only)
5.5.4.8.1 Audio Terminology
The following terms will be used throughout the audio panel configuration sections and are defined here.
ALERT - Unswitched inputs. These inputs are typically warnings, and there is no way for the user to de-
select the audio.
COPILOT - The second crewmember is considered the COPILOT. The copilot is typically the front
right-seat for airplanes.
CREW - Refers to aircraft occupants who can transmit on radios. i.e. PILOT and COPILOT. In certain
installations, each crew member may be able to individually select radios.
ICS - Intercom Communication System - This refers to the distribution of microphone audio for each
occupant in the aircraft.
PA - Passenger Address - This refers to a crewmember broadcasting audio to the Passengers either
through headsets or speakers outside of the ICS distribution.
PASSENGERS - Occupants considered passengers are not able to transmit or select individual radios,
and are treated as a group in that each PASSENGER hears the same audio.
PILOT - The first crewmember is considered the PILOT. The pilot is typically the front left-seat for
airplanes. This crew position will always hear Selected Audio (SA).
PTT - Push-To-Talk - This refers to keyed microphone transmissions. An input must be activated before
the microphone audio is transmitted.
PRIMARY RADIO - For a crewmember, the Primary Radio is the radio selected for transmission. A
Push-to-talk (PTT) by a crewmember will transmit over the PRIMARY RADIO.
SA - Selected Audio - This refers to the combination of audio sources selected by the crewmember. Note
that Alerts are separate from Selected Audio.
SECONDARY RADIOS - For a crewmember, any radio selected for monitoring that is not selected for
transmission is considered a Secondary Radio.
SOFT MUTE - When music audio is muted due to an audio interruption such as ICS or alerts, Soft Mute
feature allows music audio to fade in gradually to the original volume setting after muting.
SIDETONE - Side tone refers to the audio spoken into the microphone by an occupant. Many half-
duplex radios provide side tone audio to the radio's received audio output. When transmitting on these
radios, it is not desired for the Audio Panel to provide the side tone to the headset since this is usually
provided by the transceiver. For PA and Telephone audio, side tone distribution may be adjusted.
197


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