COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
FA2100CVR
Page 20
Nov. 01/98
Description and Operation
23–70–04
N. Remote Microphone Module
The Model S055/S056 Remote Microphone Modules are available to complete a
TSO−C123a and ED–56A-compatible installation. The Model S055 Microphone is
required with the S151 and S251 Control Units, and with the S150 Preamplifier Mod-
ule. The Model S056 Microphone is required with the S161 and S261, and with the
S160 Preamplifier Module.
O. Ground Support Equipment Interface
The interface to the Ground Support Equipment (GSE) is via a bi-directional high-
speed serial link available at the front-panel GSE connector.
A facility for retrieving the stored data from the CSMU to Ground Support Equip-
ment, GSE, is provided for high-speed downloading of the voice data. The GSE In-
terface serves two purposes:
(1) As a connector for use with portable or bench test equipment for recorder
checkout.
(2) As a connector for use in downloading data into a storage device while on the
aircraft or bench.
P. BIT and Fault Detection
The FA2100 incorporates multiple overlapping methods of built−in−test (BIT) to en-
sure proper reporting of the recorder faults. At the most basic level the fault driver
outputs default to the FAULT state (even with no power applied to the recorder) and
must be actively cleared by a properly operating Store Manager Processor (SMP) as
the recorder powers up.
Next, a watchdog circuit monitors the operation of the SMP and associated circuitry.
This assures that a fault is asserted in the event of a processor failure (including par-
tial failures such as arithmetic errors, inordinate increments, and logic errors.) The
watchdog circuit will also be activated in the event of a failure of the SMP
s program
Flash memory.
If the SMP is operating properly it performs the task of monitoring the above listed
faults in the other FA2100 processors. It detects errors in the Flight Data Processor
(FDP) and Audio Compressor Processor (ACP) by checking for protocol errors and
unexpected data values.
Apr. 30/1
Rev. 09 Page 20
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