Page 4-10
GMA 1347D Installation Manual
Revision C
190-00303-21
4.4.3 Com Audio and Mic Keys
Table 4-13. Com Audio and Mic Keys Pin Assignments, J3471
Pin Pin
Name
Description
I/O
27
ON-SIDE COM MIC KEY*
Out
33
CROSS-SIDE COM MIC KEY*
Out
78
COM 3 MIC KEY*
Enables audio into the respective
transceiver unit
Out
7
ON-SIDE COM AUDIO IN HI
COM 1 audio input for GMA #1
COM 2 audio input for GMA #2
In
26
ON-SIDE COM MIC AUDIO OUT HI
COM 1 audio output for GMA #1
COM 2 audio output for GMA #2
Out
8
ON-SIDE COM AUDIO LO
Ground reference for COM 1 audio
(GMA #1)
Ground reference for COM 2 audio
(GMA #2)
--
12
CROSS-SIDE COM AUDIO IN HI**
COM 2 audio input for GMA #1
COM 1 audio input for GMA #2
In
32
CROSS-SIDE COM MIC AUDIO OUT
HI**
COM 2 audio output for GMA #1
COM 1 audio output for GMA #2
Out
13
CROSS-SIDE COM AUDIO LO**
Ground reference for COM 2 audio
(GMA #1)
Ground reference for COM 1 audio
(GMA #2)
--
58
COM 3 AUDIO IN HI
COM 3 audio input
In
77
COM 3 MIC AUDIO OUT HI
COM 3 audio output
Out
59
COM 3 AUDIO LO
Ground reference for Com 3 audio
--
* Denotes Active Low (Inputs: ground to activate; Outputs: grounded when active).
** Denotes analog inputs not used in digital installations.
4.4.4 Nav Audio
Table 4-14.
Nav Audio
Pin Assignments, J3471
Pin Pin
Name
Description
I/O
6
ON-SIDE NAV AUDIO IN HI**
Nav 1 audio input for GMA #1
Nav 2 audio input for GMA #2
In
25
ON-SIDE NAV AUDIO IN LO**
Nav 1 ground reference for GMA #1
Nav 2 ground reference for GMA #2
In
14
CROSS-SIDE NAV AUDIO IN
HI**
Nav 2 audio input for GMA #1
Nav 1 audio input for GMA #2
In
34
CROSS-SIDE NAV AUDIO IN
LO**
Nav 2 ground reference for GMA #1
Nav 1 ground reference for GMA #2
In
** Denotes analog inputs not used in digital installations.
