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ATN applications deflned below.
b) directory information rctricval; and
Note 2.- The implementation ofpre-defined subsets of the
ATN applicution technical provisions are allowed as detailed c) directory information change.
in Doc 9705.
3.5.1 System applications
Note I.- The ATN Directoly Service provides a capability
for an upplication or user to que y a distributed directo y data
base and to retrieve addressing, security and technical
capabilities information. Directoly Service provides a
Note.- System applicafions provide sewices that are
capability to special, authorized users to add, delete and
necessary for operation of the ATN air-groctnd applications,
modify parts of the directoly data base for which they are
ground-ground applications andor ATN communication responsible. The Directory Service is offered over the ATN to
services.
all applications and users com.p~ly ing- with the technical
of Doc 9705, Sub-volume VII .
3.5.1.1 CONTEXT MANAGEMENT (CM)
APPLICATION
Note.- The CM application provides the capability for an
aircrafi to log on with an ATS ground system; in some
instances the ground system will request the aircraft to conract
a specific ground system. Once an appropriate connection is
established, CM provides for the exchange of infomzation on
each supported ATN upplicarion including the network uddress
of each, as appropriate. For ATN systems supporting security
services, CM also obtains and exchanges key and key usage
informarion. CM also provides the capability to update log-on
infomzation and the capability for an ATS ground system to
forward log-on information to another ATS ground system. The
registration function of the CM allows the sharing of
information with other applications on the ground or on the
aircr~fi.
3.5.1.1.1 The ATN shall be capable of supporting the
following CM application functions:
Note 2.- Directory bind is the function of establishing an
association between two directory components that support
other directory functions. Directory bind sers up the application
contexts and underlying communications connections
for use in other directoryfunctions.
3.5.1.3 OTHER SYSTEM APPLICATIONS
(to be developed)
3.5.2 Air-ground applications
Note.- The ground components of air-ground upplicarions
irzclude functionality to support the forwarding of the contents
of air-to-ground messages along ground-ground communications
paths.
Annex 10 - Aeronautical Telecommunications Volume 111
3.5.2.1 AUTOMATIC DEPENDENT
SURVEILLANC(AED S) APPLJCATJON
Note.- The ADS application comprises an airborne and
ground component. The airborne ADS applicution component
is capable of automatically providing, via the ATN
communications service, to the ground component data
derived from on-board navigation esterns (e.g. aircraft
ident$cation, four-dimensional position, intent, and
additional data as appropriate). The ADS application provides
service based on contracts established between its air and
ground components (i.e. demand contract, periodic contract,
event contract and emergency contract) and between two ADS
ground components (i.e. forward contract).
3.5.2.1.1 The ATN shall be capable of supporting the
following ADS application functions:
a) demand- contracts;
b) periodic contracts;
c) event contracts;
d) emergency contracts; and
e) forward contracts.
Note.- The technical provisions for the ADS application
are defined in Doc 9705, Sub-volume 11.
3.5.2.2 CONTROLLER-PILDOATT AL INK
COMMUNICATIO(CNPSD LC) APYL~CATION
Note.- The CPDLC application, comprising an airborne
and groun,d component, provides capability for data link
commun.ications between ATS units and aircraft under their
control and/or aircrgji about to come under their control. The
CPDLC application has tht capability to establish, manage,
and terminate CPDEC diulogues for controller-pilot message
exchange and for ground message forwarding.
3.5.2.2.1 The ATN shall be capable of supporting the
following CPDLC application functions:
a) concrollcr-pilot message exchange;
b) transfer of data authority;
c) downstream clearance; and
d) ground forward.
Note.- The technical provisions for the CPDLC
application are defined in Doc 9705, Sub-volume I].
3.5.2.3 FLIGHT ~NFORMATIONS ERVICE(H S)
APPLICATIONS
Note.- FIS applications provide flight information services
to airspace users from ground FIS systems.
3.5.2.3.1 AUTOMATIC DRMINIANFLO RMATION SERVICE
(ATIS) APPLICATION
3.5.2.3.1.1 The ATN shall be capable of supporting the
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