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Annex I0 - Aeronautical Telecommunications Volume Ill
Opelz systems intercon~zection (OSI) reference model. A
model providing a standard approach to network design
introducing modularity by dividing the complex scl of
functions into seven more manageable, self-contained,
functional layers. By convenlion these are usually depicted
as a vertical stack.
Note.- Tlzc OSI reference model is defined by 1SOJEC
7495-1.
Performance management. An ATN sy stems management
facility to monitor and evaluate the performance of the
systems.
Security management. An ATN systems management facility
for access control, aulhenticarjon and data integrity.
Subrzehuork. An actual implementation of a data network that
employs a homogeneous protocol and addressing plan and
is under control, ol' a single authority.
System level requirement. The system level requirement is a
high-level technical requirement that has been derived from
operational requirements; technological constraints and
regulatory constraints (administrative and institutional). The
system level requirements are the basis for the functional
requirements and lower-level rcyuirements.
Transit delay. In packet data systems, the elapsed time
between a request to transmit an assembled data packet and
an indication at the receiving end that the correspondi~~g
packet has been received and is ready to be used or
forwarded.
Upper layers (UL) communicatio~zss ervice. A term pertaining
to the session, presentation and application layers of the
OSI reference model.
3.2 INTRODUCTION
3.2.1 The aeronautical telccornmunication network (ATN)
comprises application entities and communication services
which allow ground, air-to-ground and avionics data
subnetworks to interoperate by adopting common interface
services and protocols based on Lhe International Organization
for Standardization (ISO) open syslems interconnection (OSI)
reference model. The conceptual model of the ATN is shown
in Figure 3-1 .*
* All figures are locatcd at the end of this chapter.
3.2.2 Thc ATN and the associated application processes
have been designed in support of the con~munica~ions,
navigation, surveillance and air traffic management
(CNS/ATM) systems. The ATN:
a) is specifically md exclusively intended to provide data
communications services to air traffic scrvice provider
organizations and aircraft operating agencies supporting
the following types of communications traffic:
1) air traffic services communication (ATSC);
2) aeronautical operational control (AOC);
3) aeronautical administrative communication (AAC);
and
4) aeronautical passenger communication (APC);
b) provides, in a manner transparent to the user, a reliabIe
end-to-end comn~unicationss ervice essential to support
lhe provision of sak and efficient air traffic services,
between:
1) airborne systems and ground syslems; and
2) multiple ground systems;
c) provides a data communication service which is capable
of meeting the security and safety requirements of the
users;
d) is based on internationally recognized data communications
standards which will fadirate the development
of compliant systems and encourage the competitive
provision of network se~vices;
e) accommodates differing rypes/categories/classes of servicc
(including preferredlselected air-ground subnetwork)
rcquired by the various applications;
f,) defines an architecture that enables the integralion of
public and private subnetworks, both air-ground and
ground-ground. This allows the usc of existing/planned
infrastructure and network lechnologies, 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 Tile ATN applications presently d~linedh ave been
developed to provide aeronautical communication, surveiIlance,
and information scrvices. These applications are
inlended to supporl the following air traffic nlanagemerlt
scrvices:
111 110 1
Nu. 76
Part I Annex 10 - Aemnautical Telecommurzications
a) air traffic services (ATS);
I) air traffic control service;
2) flight information service (FIS); and
3) aledng service.
b) air trafiic flow management (AWM); and
3.3.3 Requirements for use of the ATN shall bc made on
the basis of regional air navigalion agreements.
3.3.4 Recommendation.- Civil aviation authorities
should co-ordinate, with national autlzoritie~a nd aeronautical
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