COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
FA2100CVR
Rev. 15 Page 37
Apr. 14/16
Description and Operation
23–70–04
Use or disclosure of information on this sheet is subject
to the restrictions on the cover page of this document.
(3)
ARINC 557/757A Aircraft Interface Signals
Table 5 lists the signal interfaces between the FA2100 Aircraft Interface PWA and
Acquisition Processor PWA.
Table 5. Aircraft Interface PWA to Acquisition Processor PWA Interface Signals
Signal Name
Description
39VDC
36.6
$
2 volt dc output provides up to 16 watts, maximum, to the
main power supply. Up to an additional 4 watts can be supplied to
external test equipment with nominal input voltages and room tem-
perature.
39VDC RTN
Return path for 39 Vdc current. Tied to ground on both PWAs.
+5VDC
+5 volt input from main power supply. Required tolerance is
$
5%.
Current required is less than 40 ma.
+12VDC
+12 volt input from main power supply. Required tolerance is
$
10%.
Current required is not more than 35 ma.
−
12VDC
–12 volt input from main power supply. Required tolerance is
$
10%.
Current required is not more than 25 ma.
PREAMP PWR
(+18VDC)
+18 volt input from the main power supply, current limited on Acquisi-
tion Processor. Required tolerance is
$
2 volts.
Current requirement is less than 25 ma.
+15VDC
+15 volt output made from Storage Supply input voltage. Tracks the
unregulated input below about 15 volts and then regulates at that lev-
el. +18VDC of the main supply is diode coupled to this signal and
provides the power after the main supply is running. Maximum cur-
rent required by Aircraft Interface is 20 ma. The Aircraft Interface can
supply 100 ma to the Acquisition Processor until the main supply
starts running.
+ 5VDC (S)
+5
$
0.1 volt output made by Storage Supply to provide power to the
main power supply control circuits. The external current must be less
than 10 ma.
Data Link & OMS*
* Used with
2100
−
1025/1026/
1027
−
XX only
Inputs (A, B)
−
Conditioned, differential Data Link/OMS input to AP
PWA [only used with 205E2502
−
10/11 AP boards. (MOD
−
DOT 5
Units.)]
Outputs (A, B)
−
Data Link/OMS output signal for Acquisition Proces-
sor, which drives the ARINC
−
429 output buffer.
C.
Audio Compressor (AC) PWA
The Audio Compressor (AC) provides a data interface between the Aircraft Interface
(AI) and the Acquisition Processor (AP). The AC digitizes, compresses, and pack-
ages four audio channels for subsequent processing by the AP. The AC provides in-
terfaces between the AI and the AP for Greenwich Mean Time (GMT) Data, Rotor
Speed (RSE) Data, and Discrete Data.
The document reference is online, please check the correspondence between the online documentation and the printed version.
