User Manual

AFIRS 228S Iridium Global Communications System Installation Manual
16 July 2014 L-3 Aviation Recorders Proprietary Page 24
165E5733-00 Rev. 03
Table 3-3 – J1C Bottom Plug (BP) Insert
Pin Size Description
1 20 Not Used
2 12 Primary 28 VDC Power Input
3 12 Power Ground
4 20 Not Used
5 20 Not Used
6 20 Not Used
7 12 Not Used
8 16 Chassis Ground
9 16 Not Used
10 16 Not Used
11 16 Not Used
12 5 Not Used
13 5 Iridium/GPS Antenna
Figure 3-9 – SDU Connector Map
3.5.2 Power Input
The Iridium SATCOM System is powered by +28 VDC.
3.5.3 Chassis Ground
Quantity 1
Format DC Chassis Ground
For redundant chassis ground connection only.
Not to be used as a normal current carrying conductor.