-Air/Ground communication services . Air/ground Routing Function (ARF) . Communication subnetworks management . Communication subnetworks access . Messages formatting
 -Human/Machine Interface (HMI) services . HMI resources (MCDU, printer...) management . HMI resources access
 -On-board Integration Services . On-board data access and delivery for hosted applications . On-board data access and delivery for remote AOC applications (On-board routing function)
 -System Management services . system configuration set-up . system status monitoring . system maintenance (BITE) . operating system to use and share the hardware resources.

 (c)
 Interface Services The interface services are low-level services shared by the functional services and used to handle the ATSU interfaces:

 -Discrete signals input or output management
 -ARINC 429 broadcast and Williamsburg protocol

R **ON A/C 106-149, 151-199, 201-299, 301-399, 401-499,
 (2) ATSU hardware case description
 (Ref. Fig. 013)
 (a)
 Characteristics The ATSU complies with ARINC 600 Specification:

 -size : 4MCU case
 -weight : 6kg
 -dissipated power : 55.5 Watts in average value and 70 Watts in maximum value
 -unit connectors size : 2 shell

 (b)
 Operation It provides the functions with hardware resources such as:

 -processing power
 -memory capacity
 -Input/Output electrical circuit
 -power supply
R 1EFF : 106-149, 151-199, 201-299, 301-399, 1 46-21-00Page 57 1401-499, 1Aug 01/05 1 1 1CES 1

 ATIMS - ATSU Hardware Case
 Figure 013

R 1EFF : 106-149, 151-199, 201-299, 301-399, 1 46-21-00Page 58 1401-499, 1Aug 01/05 1 1 1CES 1 and with minimum software to enable the corresponding softwares loading:

 -hardware initialization
 -data loading processing.
 (3) ATSU A/C Interface Software
 (a)
 Characteristics This software is provided by a set of disks. It complies with ARINC 615 Specification.

 (b)
 Operation
 The different functions provided are :

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

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

 -
management of the human/machin interface (MCDU, printer and alert function)

R **ON A/C 062-099, 106-149, 151-156, 159-199, 201-299, 301-399, 401-499,
R Post SB 46-1013 For A/C 062-099,151-156,201-209,
 (4) ATSU configuration software
 (a)
 Characteristics This software is provided in a set of disks. It complies with ARINC 615 Specification.

 (b)
 Operation This software consists of a database containing:

 -routing policies definitions A routing policy lists a set of allowed media, with a preference order and the conditions which lead to a change of media. A downlink AOC message is submitted to the ACARS router with a routing policy code. The meaning of this code is customizable for hosted AOC applications and ATSU 619 peripherals except FMGC: it can specify a subnetwork to be used, an ordered list of subnetworks and a service provider for the VHF subnetwork.
 -configuration elements The configuration database contains two software pin-programming: HFDL pin-programming for ATC applications and
R 1EFF : 062-099, 106-149, 151-199, 201-299, 1 46-21-00Page 59 1301-399, 401-499, 1Aug 01/05 1 1 1CES 1 VHF3 voice/data switching through the MCDU (it will be inhibited if ATC applications are uploaded).

 -downlink messages priorities.
 (5) Router Parameters software
 (a)
 Characteristics This software is provided in a set of disks. It complies with ARINC 615 Specification.

 (b)
 Operation This software consists of a database containing the standard DSP world map database:

 -media configuration tables The media configuration tables give the ARINC 618 parameters for each air/ground communication medium, such as timers, counters, identifiers. There is a Satcom media configuration table and a VHF media configuration table for each service provider.
 -VHF world map The VHF world map database contains the VHF geographical areas for each service provider. The world map is described over 512 rectangular areas defined by the latitude/longitude of their south-east limits. It can be presented in an array form or in graphic format. The first defined area is delimited by 90.N at its north border and 180.W at the west border. In the standard DSP world map, the order of the service providers is not taken into account. When more than one service provider cover an area, a scan mask must be defined.
　
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