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standards which wilI facilitate the development
of compliant systems and encourage the competitive
provision of network services:
e) accommodates differing types/categories/classes of service
(including preferrediselected air-ground subnetwork)
rcquired by the various applications;
fj defines an architecture that enables the integration of
public and private subnetworks, both air-ground and
ground-ground. This allows the use of existingJplanned
infrastructure and network technologies, as well as
giving implementors the freedom to scale the network
to meet the increasing needs of the users; and
g) efficiently uses the bandwidth limited air-ground
subnetworks and consequently reduces the associated
costs.
3.2.3 The ATN applications presently defined have been
developed to provide aeronautical communication, surveillance,
and informatjon services. These applications are
intended to support the following air traffic management
services:
a) air traffic services (ATS)
1) air traffic control service
2) flight information service (FIS)
3) alerting service.
b) air traffic flow management (ATFM)
c) airspace management
3.2.4 This chapter contains broad and general provisions
for the ATN. The detailed technical provisions arc found in
Doc 9705 - Manual of Technical Provisions for the Aeronautical
Telecommunication Network (ATN). The remainder of
this chapter is organized to address the following requirements
and functions:
a) general:
b) sys tern level requirements;
C) ATN applications requirements;
d) ATN communications service requirements:
e) ATN naming and addressing;
f ) ATN system management requirements: and
g) ATN security requirements.
3.3 GENERAL
3.3.1 The aeronautical telecommunication network
(ATN) shall provide data communication services and
application entities in support of:
a) the delivery of air traffic services (ATS) to aircraft;
b) the exchange of ATS information between ATS units:
and
c) other applications such as aeronautical operational
control (AOC) and aeronautical administrative communication
(AAC).
Note I.- Provisions have been made to accommodate the
exchange of informution such as weather; flight plans. notices
to airmen and dynamic real time air trafJicJow management
between aircrajt operating agencies' ground-based systems
and ATS units.
Note 2.- Provisions have also been made to accommodate
aeronautical passenger communication (APC).
3.3.2 When the ATN is used in support of air traffic
services, it shall conform with the provisions of this chapter.
3.3.3 Requirements for use of the ATN shall be made
on the basis of regional air navigation agreements.
3.3.4 Recommendation.- Civil aviation authorities
should co-ordinate, with national authorities and aeronautical
industry, those implemenration aspects of the ATN which will
permit its world-wide safety. interoperability and efficient use,
as appropriate.
3.4 SYSTEM LEVEL REQUIREMENTS
Note.- The system level requirements are high-level
technical requirements that have been derived from operational
requirements, technological constraints and regulatory
5/11/98
No. 73
Annex 10 - Aeronautical Telecommunications
constraints (administrative and institutional). These system
level requirements are the basis for the finctional requirements
and lower-level requirements.
3.4.1 The ATN shall use International Organization for
Standardization (ISO) communication standards for open
systems interconnection (OSI).
3.4.2 The ATN shall provide a means to facilitate
migration to future versions of application entities and/or the
communication services.
Note.- It is an objective that the evolution towards@ture
versions facilitates the backward compatibility with previous
versions.
3.4.3 The ATN shall enable the transition of existing
AFTN users and systems into the ATN architecture.
3.4.4 The ATN shall make provisions whereby only the
controlling ATS unit may provide ATC instructions to aircraft
operating in its airspace.
Note.- This is achieved through the current and next data
authority aspects of the controller-pilot data link comrnunications
(CPDLC) application entiiy.
3.4.5 The ATN shall accommodate routing based on a
pre-defined routing policy.
3.4.6 The ATN shall provide means to define data
communications that can be carried only over authorized paths
for the traffic type and category specified by the user.
3.4.7 The ATN shall offer ATSC classes in accordance
with the criteria in Table 3-l.*
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