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Part I Annex 10 - Aeronautical Telecommunications
ATS interfacility data commu~iication (AlDC). Automalcd
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 the conveyance of another ATS message by the service
provider.
ATS unit (ATSU). A generic term meaning variously, air
traffic control unit, flight information centre or air traffic
services reporting office.
Authentication. A process used to ensure the identity of a
person/user/network entity.
Authorized path. A communication path that the administrator(~)
of the routing domain(s) has predefined as
suitable for a given traffic type and category.
Auto~natic dependent surveillance (ADS). A surveillance
technique in which aircraft automatically provide, via a data
link, data derived from on-board navigation and positionfixing
systems, including aircraft identification, fourdi~
nensional position, and additional data as appropriate.
Automatfc terminal information servlce (AXIS). Thc
alltomatic provision of current, routine information to
arriving and departing aircraft throughout 24 hours or a
specified portion thereof.
Data link-automatic renninal infinnation service (D-ATIS).
The provision of ATIS via data link.
Voice-uutomaric termirzal information service (Voice-ATIS).
The provision of ATIS by means of continuous and
repetitive voice broadcasts.
Configuration management. An ATN systems management
facility for managers to change the configuration of remote
elements-
Context management (CM) application. An ATN application
that provides a log-on service allowing initial aircraft
introduction into the ATN and a directory of all other data
link applications on the aircraft. It also includes functionality
to forward addresses between ATS units.
Note.- Confext management is a recognized OSI
presentation layer term. The OSI use and the ATN use have
nothing in common.
Context management (CM) servet. An ATS facility that is
capable of providing application information relating to
other ATSUs to requesting aircraft: or ATSUs.
Controller pilot data link communication (CPDLC). A means
of communication between controller and pilot, using data
link fox ATC communications.
CPDLC application. An ATN application that provides a
means of ATC data communication between controlling,
receiving or downstream ATS units and the aircraft, using
air-ground and ground-ground subnetworks, and which is
consistent with the ICAO phraseology for the current ATC
voice communication.
Datailztegrity. The probability that data has not been altered
or destroyed.
D-METAR. The symbol used to designate data link avjation
weather report servicc.
End system (ES). A system that contains the OSI seven layers
and contains one or more end user application processes.
End-to-end. Pertaining or relating to an entire communication
path, typically from (1) the interface between the information
source and the communjcation system at the
transmitting end to (2) the interface between the communication
system and the information user ox processor or
application at the receiving cnd.
Entity. An active element in any layer which can be either a
software entity (such as a process) or a hardware entity
(such as an intelligent UO chip).
Fault munagement. An ATN systems management facility to
detect, isolate and correct problems.
FIS application. An ATN application that provides to aircraft
information and advice useful for the safe and efficient
conduct of flights.
Flight information service (FIS). A service provided for the
purpose of giving advice and information useful for the safe
and efficient conduct of flights.
Inter-centre communications (ICC). ICC is data communication
between ATS units to support ATS, such as notification,
coordination, transfer of conlrol, flight planning,
airspace management and air traffic flow management.
Intermediate system (IS]. A system which performs relaying
and routing functions and comprises the lowest three layers
of the OSI reference model.
Internet communications service. The internet communications
service is an internetwork architecture which allows
ground, air-to-ground and avionics data subnetworks to
interoperate by adopting common interface services and
protocols based on the ISOlOSI reference model.
METAR applicatiorr. A FIS application that supports the
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