L3 FA2100 CVR Component Maintenance Manual With Illustrated Parts List page 115

AVIATION RECORDERS
COMPONENT MAINTENANCE MANUAL
FA2100CVR
The Audio Compressor PWA receives conditioned audio, GMT, rotor speed, and
discrete command/control data from the AI concurrently. Audio and ARINC 429 in-
put data are processed by the AC and formatted into 16–bit wide words for serial
Time Division Multiplexed (TDM) Bus transmission to the AP. Discrete data from the
AI are consolidated into word format prior to TDM transmission.
Discrete data received over the TDM Bus from the Acquisition Processor provide the
Audio Compressor with Built–In Test (BIT) control and with BIT fault status; fault sta-
tus data are output to the Aircraft interface PWA. Additionally, audio data repro-
cessed on the Audio Compressor are output to the Aircraft Interface for audio moni-
toring. Power/ground and a master reset for the Audio Compressor are derived
from the Acquisition Processor PWA.
The Audio Compressor PWA interfaces with the Aircraft Interface and the Acquisition
Processor. The AC/AI interface comprises four audio input channels: an audio
monitoring output channel, a serial ARINC 429 GMT data input channel, and inputs
for rotor speed frequency and discrete control data. The AC/AP Interface consists of
a serial TDM bus, a master clock signal, a master reset, a test mode control bit, and
power/ground interconnections.
The information transmitted by the AC over the serial TDM bus includes audio, GMT,
rotor speed, and discrete data. Information received by the AC over the serial TDM
bus includes discrete data for status and control.
The AI/AC Interface includes the Audio Interface, the GMT Interface, the Rotor
Speed Interface, and the Discrete Data Interface.
23–70–04
Use or disclosure of information on this sheet is subject
Description and Operation
to the restrictions on the cover page of this document.
Rev. 15 Page 38
Apr. 14/16
The document reference is online, please check the correspondence between the online documentation and the printed version.