-Downlink block identifier: only appears in the message transmitted by the aircraft. Enables the ground to detect duplicated messages.
-Start of text: indicates the start of useful data transmission.
-Text: useful data. Only one part of the ISO 5 characters can be transmitted in this field.
-Suffix: indicates the end of useful data transmission.
-Block check sequence: result of a computation made before transmission on the previous bit set. At reception, the same computation is made and the two results are compared. If they are identical, the transmission is correct.
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R **ON A/C 106-149, 151-199, 201-299, 301-399, 401-499,
E. Indicating and Recording systems /ATIMS interface The ATIMS is interfaced with different sub-systems of the Indicating and Recording systems:
-FWS (FWC/SDAC)
-EIS (DMC)
-Clock
-AIDS (DMU)
-CFDS (CFDIU, Printer)
-Data Loading System
(1) ATIMS/FWS interface The FWS are used to generate warning indications to the crew. The ATSU broadcasts data on its output buses for information transmission to the FWC. On the other hand, the ATSU acquires FWC and SDAC broadcasted data which are needed for AOC hosted application. The ATSU broadcasts on ATSU SYS1 & SYS2 output buses data for:
-AIrline warnings
-Datalink system alarms The FWC and the SDAC broadcast on FWC L1, FWC L2, SDAC L1 or SDAC L2 buses data for:
-AOC application data delivery
-ACARS Routing function data delivery.
(a) Company alerts The ATSU generates the alert while the FWCs manage the alert display, the flight phase inhibition, the alert cancel and priority. The ATSU sends signals to the FWCs for memos activation on the EWD:
1_ when an alert message is received from the airline.
2_ when a VOICE GO-AHEAD message is received from the airline
requiring a voice communication
3_ when a standard AOC message is received from the airline.
NOTE : These messages are inhibited during takeoff and landing____
phases.
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(b) System Alarms
1_ The system management function of the ATSU sends signals to
the FWCs concerning its own status and the VDR3 mode.
2_ The air/ground communication router of the ATSU sends signals
to the FWCs concerning the status of the interface with
communication system peripherals and the datalink
communication availability.
3_ The FWCs generate the system alarms such as internal ATSU
alarm, datalink alarm and communication system alarm,
according to the flight phases inhibition and the priority
level.
4_ The FWC display the warnings/malfunctions in amber on the
upper ECAM DU, the INOP SYSTEM in amber and the limitations in
cyan on the System Display (SD).
(c) A/C configuration parameters The FWCs provide the ATSU with A/C configuration parameters as software pin programming: SDU1 and DMU installed or not installed. These information are used by the system management function of the ATSU for peripherals management (alarm signals, BITE message generation or inhibition, on-board routing function...).
(2)
ATIMS/Clock interface The clock provides the ATSU with UTC date and time for printed message datation. The ATSU acquires from Clock output bus these broadcasted data.
(3)
ATIMS/EIS interface The ATSU acquires from DMC output bus broadcasted data which are needed for AOC hosted application.
(4)
ATIMS/AIDS interface The DMU is an optional peripheral hosting a remote AOC application. A pin-programming sent by the CFDIU enables the ATSU to determine if the DMU is installed or not. The ATSU/DMU interface supports exchanges using ARINC 429 protocol. These exchanges concern ARINC 619 messages related to the remote AOC application hosted in the DMU. The DMU uses the ATSU as an ACARS Router to send DMU downlink reports and to receive DMU uplink requests.
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