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as, for instance, digitized voice.
CHAPTER 2. GENERAL
[to be developed]
ANNEX 10 - VOLUME 111
CHAPTER 3. AERONAUTICAL
TELECOMMUNICATION NETWORK
3.1 DEFINITIONS
Note 1.- The following definition,^ were taken from
ISOflEC 7498-1, Information technology - Open Systems
Interconnection - Basic Reference Model (Reference: ITU-T
Rec. X.200 (1994)) and from ICAO Doc 9705 - Manual of
Technical Provisions for the Aeronautical Telecommunication
Network (ATN).
Note 2.- ICAO Doc 9705 has evolved through multiple
editions. Each sub-volume of rhnr document indicates tlze
evolution of the provisions between successive editions.
Note 3.- Sub-volume I of ICAO Doc 9705 provides a
cross-reference chart between versions (i.e. embedded sojtware
capabilities) and editions (i.e. technical provisions).
Accounting management. An ATN systems management
facility to monitor users for use of network resources and to
limit the use of those resources.
ADS application. An ATN application that provides ADS data
from the aircraft to the ATS unit(s) for surveillance
purposes.
Aeronautical administrative communication (AAC). Communication
used by aeronautical operating agencies related to the
business aspects of operating their flights and transport
services. This communication is used for a variety of purposes,
such as fight and ground transportation, bookings, deployment
of crew and aircraft or any other logistical purposes that
maintain or enhance the efficiency of over-all flight operation.
Aeronautical operational control (AOC). Communication
required for the exercise of authority over the initiation,
continuation, diversion or termination of flight for safety,
regularity and efficiency reasons.
Aeronautical passenger communication (APC). Communication
relating to the non-safety voice and data services to
passengers and crew members for personal communication.
AIDC application. An ATN application dedicated to
exchanges between ATS units (ATSUs) of air traffic control
(ATC) information in support of flight notification, flight
coordination, transfer of control, transfer of communication,
transfer of surveillance data and transfer of general
data.
Air traflic service. A generic term meaning variously, flight
information servicc, alerting service, air traffic advisory
service, air traffic control service (area control service,
approach control service or aerodrome control service).
Application. The ultimate use of an information system, as
distinguished from the system itself.
Application entity (AE). Part of an application process that is
concerned with communication within the OSI environment.
The aspects of an application process that need to be
taken into account for the purposes of OSI are represented
by one or more AEs.
Application information. Refers to thc application names (e.g.
AE qualifiers such as ADS and CPC), version numbers, and
addresses (the long or short TSAP, as required) of each
application.
ATZS applicalion. A FIS application that supports the D-ATIS.
ATN directory services @ZR). A service which provides the
capability for an application entity or user in thc ATN
community to query a distributed directory data base and
retrieve addressing, security and technical capabilities
information relating to other users or entities within the
ATN community.
ATN security services. A set of information securi~y
provisions allowing the receiving end system or
intermediate system to unambiguously identify (i.e.
authenticate) the source of the received information and to
verify the integrity of that information.
ATN systems management (SM). A collection of facilities to
control, coordinate and monitor the resources which allow
communications to take place in the ATN environment.
These facilities include fault management, accounting
management, configuration management, performance
management and security management.
ATSC class. The ATSC class parameter enables the ATSC user
to specify the quality of service expected for the offered
data. The ATSC class value is specified in terms of ATN
end-to-end transit delay at 95 per cent probability.
ATS communications (ATSC). Communication related to air
traffic services including air traffic control, aeronautical and
meteorological information, position reporting and services
related to safety and regularity of flight. This communication
involves one or more air traffic service administrations.
This term is used for purposes of address
administration.
1111101
No. 76
4 ANNEX 10 - VOLUME III
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