L3 Communications FA2100 - Aircraft Interface PWA to Audio Compressor PWA Interface Signals; ARINC 557;757;757 A Aircraft Interface Signals between Aircraft Interface and Audio Compressor Pwas

COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
FA2100CVR
Page 33
Nov. 01/98
Description and Operation
23–70–04
Table 3. (Cont.) ARINC 557/757/757A Aircraft Interface Signals
Signal Name Description
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 2100−1025/1026−/1027( ) 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.
Table 4. Aircraft Interface PWA to Audio Compressor PWA Interface Signals
Signal Name Description
CH 1 IN HI Single ended, Channel 1 audio output to Audio Compressor. Signal
level is 2 Vrms $10% with reference signal applied to CVR Channel
1 input.
CH 2 IN HI Single ended, Channel 2 audio output to Audio Compressor. Signal
level is 2 Vrms $10% with reference signal applied to CVR Channel
2 input.
CH 3 IN HI Single ended, Channel 3 audio output to Audio Compressor. Signal
level is 2 Vrms $10% with reference signal applied to CVR Channel
3 input.
CH 4 IN HI Single ended, Channel 4 audio output to Audio Compressor. Signal
level is 1.33 Vrms $10% with reference signal applied to CVR
Channel 4 input.
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Rev. 11 Page 33