L3 FA2100 CVR, Руководство по техническому обслуживанию компонентов с иллюстрированным списком запчастей

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COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
FA2100CVR
Rev. 15 Page 67
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.
C. Label 377 ARINC 429 Equipment Identification Word Output
The CVR outputs a Label 377 equipment identification word on the OMS bus once
per second. The word structure is defined below:
Bit No Function Status
1­8 Label 377 11111111
9­10 SDI 00
11­18 Equipment ID (CVR = 0x57) 11101010
19­29 Not Used
30­31 SSM 00
32 Parity
D. OMS Input
For the purpose of reporting the OMS input bus status in the Label 350 CVR Status
Word output, the CVR expects a valid OMS input “heartbeat” once per second on
the low speed OMS ARINC 429 input. The heartbeat is detected through the pres-
ence of a valid Label 227 input (including good parity) to the CVR. This Label 227 is
used only for heartbeat detection and is not otherwise processed by the CVR. If the
heartbeat is not detected during three consecutive seconds, the CVR will report the
CMS Bus (OMS input) status as “failed” in the Label 350 CVR Status Word output. If
the OMS input bus is not connected, then the associated Label 350 Status Word bit
12 can be ignored.
10. CVR DATALINK INPUT INTERFACE
The FA2100 CVR, part numbers 2100
−
1X25
−
02/
−
22/
−
24 and 2100
−
1X26
−
02, was
developed specifically to satisfy recent requirements for Controller Pilot DataLink
Communications (CPDLC or “DataLink”) recording in addition to the two hour audio
recording capability. The DataLink recording function of the CVR is generally com-
patible with ARINC 429, ARINC /757A, ARINC 758, and ARINC 619. The interface
is characterized by the following specifications:
F Single, ARINC 429, High Speed, physical layer input interface (Pins 33/34)
F
Williamsburg Version 3, Bit
−
Oriented Protocol for link layer interface
F
Includes support for ALOHA exchange (but not required)
F
Records all System Address Label (SAL) 157 and/or 156 full word inputs
F
Recording of all Label 270 and Label 276 DataLink status word inputs
F Recording of all Label 350 CVR OMS status word outputs
F
32 Mbytes of crash survivable memory reserved for DataLink message recording
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