User Manual

AFIRS 228S Iridium Global Communications System Installation Manual
16 July 2014 L-3 Aviation Recorders Proprietary Page 27
165E5733-00 Rev. 03
3.5.9 Microphone Input
Quantity 1
Format Standard DO-214 Microphone Input
Dynamic Range 20 mV to 1.5 V RMS
Input Impedance 150 Ω ± 20%
Mic. Bias (No Load) 16 ± 0.5 V
Mic. Bias Ripple <1 mV RMS in the 300 – 3400 Hz band
Sidetone Provided by System to Interphone Output
Sidetone Level Software Configurable
Audio Band Pass 300 – 3400 Hz
3.5.10 Iridium / GPS Antenna
Coaxial Cable Insertion
Loss (Max.)
3 dB @ 1626.5 MHz
3.6 Maintenance Front Panel Ethernet Port (J2)
The Iridium SATCOM System SDU provides an RJ-45 Maintenance Port connector on the front panel,
which provides for Ethernet connection to Ground Service Equipment (GSE) e.g. a laptop or Personal
Computer with a standard web browser.
3.7 SDU Configuration Module (SCM)
The SCM and antenna connect directly to the SDU. The SDU is the heart of the system and provides
all of the interfaces to other aircraft systems.
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