COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
FA2100CVR
Rev. 15 Page 35
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.
Table 3. (Cont.) ARINC 557/757/757A Aircraft Interface Signals
Signal Name
Description
GMT IN
(A, B) (429)
GMT input signal. ARINC 429 format. Low Speed (12.5 kbps).
The 205E1849
−
00 and 205E1849
−
03 Audio Compressor cards
provide both 150 (1 sec resolution) and 125 (0.1 min. resolu-
tion) for 429 GMT inputs.
CHANNEL 1 AUDIO IN
(HI, LO)
3rd crew member or extra audio input. Reference signal is 1
kHz at 3 Vrms. Input impedance is greater than 10 kohms.
CHANNEL 2 AUDIO IN
(HI, LO)
Co–pilot’s audio input. Reference signal is 1 kHz at 3 Vrms. In-
put impedance is greater than 10 kohms.
CHANNEL 3 AUDIO IN
(HI, LO)
Pilot’s audio input. Reference signal is 1 kHz at 3 Vrms. Input
impedance is greater than 10 kohms.
CHANNEL 4 AUDIO IN
(HI, LO)
CAM audio input. Reference signal is 1 kHz at 2 Vrms. Input
impedance is greater than 10 kohms.
ROTOR SPEED IN
(HI, LO)
Rotor speed input data as defined in ARINC 557/757.
7
−
6000 Hz Analog Frequency Input.
VOICE ERASE
(A, C)
No Bulk Erase if “A” is grounded or connected to “C” for less
than 0.5 seconds. Bulk Erase occurs if “A” is connected to “C”
for 2 or more seconds and then grounded.
*Data Link In (A,B)
Out (A,B)
ARINC 429, Labels 156 & 157, Message for displaying ATC
Data Link messaging IAW Williamsburg V3 protocol
*OMS
In (A,B)
Out (A,B)
On
−
board Maintenance System, ARINC
−
429, Label 350, For
monitoring recorder system status including, CVR, CMC Bus,
Control Unit, FDR, and Data Link.
* Only used in 2100
−
1X25/1X26/1X27
−
( ) Models of CVR.
(2)
ARINC 557/757/757A Aircraft Interface Signals Between Aircraft Interface
and Audio Compressor PWAs
Table 4 lists the signal interfaces between the FA2100 Aircraft Interface PWA and
Audio Compressor PWA.
The document reference is online, please check the correspondence between the online documentation and the printed version.