L3 FA2100 CVR Component Maintenance Manual With Illustrated Parts List page 112

Table 3. (Cont.) ARINC 557/757/757A Aircraft Interface Signals
Signal Name
GMT IN
(A, B) (429)
CHANNEL 1 AUDIO IN
(HI, LO)
CHANNEL 2 AUDIO IN
(HI, LO)
CHANNEL 3 AUDIO IN
(HI, LO)
CHANNEL 4 AUDIO IN
(HI, LO)
ROTOR SPEED IN
(HI, LO)
VOICE ERASE
(A, C)
*Data Link In (A,B)
*OMS
* 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.
Use or disclosure of information on this sheet is subject
to the restrictions on the cover page of this document.
The document reference is online, please check the correspondence between the online documentation and the printed version.
AVIATION RECORDERS
COMPONENT MAINTENANCE MANUAL
FA2100CVR
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.
3rd crew member or extra audio input. Reference signal is 1
kHz at 3 Vrms. Input impedance is greater than 10 kohms.
Co–pilot's audio input. Reference signal is 1 kHz at 3 Vrms. In-
put impedance is greater than 10 kohms.
Pilot's audio input. Reference signal is 1 kHz at 3 Vrms. Input
impedance is greater than 10 kohms.
CAM audio input. Reference signal is 1 kHz at 2 Vrms. Input
impedance is greater than 10 kohms.
Rotor speed input data as defined in ARINC 557/757.
7−6000 Hz Analog Frequency Input.
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.
ARINC 429, Labels 156 & 157, Message for displaying ATC
Out (A,B) Data Link messaging IAW Williamsburg V3 protocol
In (A,B) On−board Maintenance System, ARINC−429, Label 350, For
Out (A,B) monitoring recorder system status including, CVR, CMC Bus,
Control Unit, FDR, and Data Link.
Description
23–70–04
Description and Operation
Rev. 15 Page 35
Apr. 14/16