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Provisions for the Aeronautical Telecommunication Network
(ATN).
ADS application. An ATN application that provides ADS data
from the aircraft to the ATS unit(s) for surveillance
purpses.
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 flight 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.
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.
ATS interfacility data communication (AIDC). Automated
data exchange between air traffic services units, particularly
in regard to co-ordination and transfer of flights.
ATS message handling services (ATSMHS). Procedures used
to exchange ATS messages over the ATN such that the
conveyance of an ATS message is in general not
correlated with thc conveyance of another ATS message
by the service provider. There are two ATS message
handling services, which are the ATS messaging service
and the ATN pass-through service.
ATS unit (ATSU). A generic term meaning variously. air
Aeronautical passenger communication (APC). traffic control unit, flight information centre or air traffic
services reporting office.
Communication relating to the non-safety voice and data
services to passengers and crew members for personal
communication.
AZDC 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 traffic service. A generic term meaning variously, flight
information service, 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.
Authorized path. A communication path that the administrator(~)
of the routing domain(s) has pre-defined as
suitable for a given traffic type and category.
Automatic dependent surveillance (ADS). A surveillance
technique in which aircraft automatically provide, via a
data link, data derived from on-board navigation and
position-fixing systems, including aircraft identification,
four-dimensional position, and additional data as
appropriate.
Automatic terminal information service (ATZS). The
provision of current, routine information to arriving and
departing aircraft throughout the day or a specified portion
of the day, via a data link or a continuous and repetitive
voice broadcast.
Application entity (AE). Part of an application process that is Context management (CM) applicatinn. An ATN application
concerned with communication within the OSI environ- that provides a log-on service allowing initial aircraft
ment. The aspects of an application process that need to be introduction into the ATN and a directory of all other data
taken into account for the purposes of OSI are represenled link applications on the aircraft. It also includes
by one or more ABs. functionality to forward addresses between ATS units.
-5111198
No. 73
ANNEX 10 - VOLUME 111
Part I Annex 10 - Aeronautical Telecommunications
Note.- Context management is a recognized OSI
presentation layer term. The OSI use and the ATN use have
nothing in common.
Controller pilot da& link communication (CPDLC).' A means
of communication between controller and pilot, using data
link for ATC communications.
CPDLC application. An ATN application that provides a
means of ATC data communication between controlling,
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