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 C. ATSU Description
 (Ref. Fig. 005A) The ATSU is the main component of the system. The ATSU consists of a hardware case with minimum software and of five packages, each one corresponding to a set of disks identified by a Functional Item Number. These disks contain the ATSU software and application software. The software is uploaded in the ATSU by means of the MDDU or the PDL. A package must be loaded completely and the application/software becomes operational after the ATSU self-test. The package part number(s) is (are) displayed on the MCDU, in the LRU IDENT page related to the ATSU. The designation on the floppy disk corresponds to abbreviated terms of the official designations:
 -------------------------------------------------------------------------------FIN DESIGNATION ABBREVIATED DESIGNATION FUNCTION
 (ON FLOPPY DISKS) -------------------------------------------------------------------------------20TX SOFTWARE-ATSU A/C S/W-ATSU A/C INTFC Aircraft Interface
 INTERFACE  package for host
 platform services -------------------------------------------------------------------------------21TX SOFTWARE-ATSU S/W-ATSU CONFIG Configuration
 CONFIGURATION  package for manufacturer configurable parameters
 -------------------------------------------------------------------------------30TX SOFTWARE-ATSU ROUTER S/W-ATSU ROUTR PARAM Router Parameters
 PARAM package -------------------------------------------------------------------------------22TX SOFTWARE-AOC S/W-AOC AOC package for
 AOC application -------------------------------------------------------------------------------24TX SOFTWARE-AOC DATABASE S/W-AOC D/B AOC package for
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 ATIMS - Functional Architecture
 Figure 005A

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 -------------------------------------------------------------------------------FIN DESIGNATION ABBREVIATED DESIGNATION FUNCTION (ON FLOPPY DISKS) -------------------------------------------------------------------------------AOC database -------------------------------------------------------------------------------
The main functions of the ATSU are:
 -
to host the various datalink applications, including Airline Operational Control,

 -
to provide management and access to the different datalink services available,

 -
to provide management and access to the various datalink networks available.

 

R **ON A/C 106-149, 151-199, 201-299, 301-399, 401-499,
 (1)
 ATSU hardware case The ATSU hardware case consists of all necessary hardware resources (hardware platform) and minimum software. The minimum software contains two main parts:

 -
the first one is in charge of hardware initialization

 -
the second part is designed to allow the uploading of the software components.

 

 (2)
 ATSU A/C interface software
 Its different functions are :

 

 -monitoring of the system (power supply and BITE functions)
 -acquisition of the aircraft parameters for application software use
 -
management of the air/ground communications (ARF function)

 -
management of the communication with the on-board peripheral units

 -
management of the Human/Machine Interface (MCDU, printer and alert

 function). The ATSU A/C interface software enables applications to access the communication environment. It contains the functional services allowing the applications to perform their tasks and the main part of the interface services. The air/ground communication services depend on the communication environment (ACARS network), while the on-board integration services and the human/machine interface services depend on aircraft system configuration.
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 (3)
 ATSU configuration software The configuration software is a complement to the A/C interface software. This software consists of a database containing routing policies definitions and configuration elements.

 (4)
 ATSU router parameters software The ATSU router parameters software is a complement to the A/C interface software. This software contains the standard DSP world map database. The DSP world map contains two types of tables: media configuration tables and VHF world map

 

R **ON A/C 106-149, 151-199, 201-299, 301-399, 401-499,
 (5) AOC software The AOC software consists of hosted AOC applications which depend on airline definition. An AOC data base enables customization of AOC applications. In this package, is defined the list of the labels used by the AOC application, which have to be extracted from the ATSU input data. These datalink applications concern operations related to the flight such as flight plans, weather, behaviour of aircraft elements transmitted for maintenance reasons, fuel quantity, personnel management, gate management...
　
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