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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.
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 communication system at the transmitting
end to (2) the interface between the communication
system and the information user or processor or
application at the receiving end.
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).
FZS application. An ATN application that provides to aircraft
information and advice useful for the safe and efficient
conduct of flights.
Flight information service (FZS). A service provided for the
purpose of giving advice and information useful for the
safe and efficient conduct of flights.
litter-centre communications (ZCC). ICC is data communication
between ATS units to support ATS, such as notification,
coordination, transfer of control, flight planning,
airspace management and air traffic Row 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 ISOIOSI reference model.
Note.- The OSI reference model is de3ned by ISO/IEC
7498-1.
Subnetwork. An actual implementation of a data network that
employs a homogeneous protocol and addressing plan and
is under control of 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 requirements.
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 corresponding
packet has been received and is ready to be used or
forwarded.
Upper layers (UL) communications service. A tern pertaining
to the session, presentation and application layers of the
OSI reference model.
3.2 INTRODUCTION
3.2.1 The aeronautical telecommunication 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 the International Organization
for Standardization (ISO) open systems interconnection (OSI)
reference model. Thc conceptual model of the ATN is shown
in Figure 3- 1 .*
3.2.2 The ATN and the associated application processes
have been designed in support .of the Communications.
Navigation, Surveillance and Air Traffic Management
(CNSIATM) systems. The Am:
a) is specifically and exclusively intended to provide data
communications services to air traFfic service provider
organizations and aircraft operating agencies supporting
the following types of communications traffic:
I) air traffic services communication (ATSC);
2) aeronautical operational control (AOC);
3) aeronautical administrative communication (AAC);
Open systems interconnection (OSZ) reference model. A and
model providing a standard approach to network design
introducing modularity by dividing the complex set of 4) aeronautical passenger communication (APC);
functions into seven more manageable, self-contained,
functional layers. By convention these are usually depicted
as a vertical stack. * All figures arc located at the end of this chapter.
5/11/98
No. 73
Annex 10 - Aeronautical Telecommunications Volume 111
b) provides, in a manner transparent to the user, a reliable
end-to-end communications service essential to support
the provision of safe and efficient air traffic services,
between:
1) airborne systems and ground systems; 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 intcmationally.recognized data communications
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