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Aeronautical passenger communication (APC). Communication
relating to the non-safety voice and data services to
passengers and crew members for personal communication.
AlDC application. An ATN application dedicated to exchanges
between ATS units (ATSUs) of air traffic control (ATC)
information in support of flight notification, flight
coordination, transfer of control, transfer of communication,
transfer of surveillance data and transfer of general data.
Air traffic service. A generic term meaning variously, flight
information service, alerting service, air traffic advisory
service, air traffic control service (area control service,
approach control service or aerodrome control service).
Application. The ultimate use of an information system, as
distinguished from the system itself.
Application entity (AX). Part of an application process that is
concerned with communication within the OSI environment.
The aspects of an application process that need to be
taken into account for the purposes of OSI are represented
by one or more AEs.
ATSC chss. The ATSC class parameter enables the ATSC user
to specify the quality of service expected for the offered
data. The ATSC class value is specified in terms of ATN
end-to-end transit delay at 95 per cent probability.
ATS communications (ATSC). Communication related to air
traffic services including air traffic control, aeronautical and
meteorological information, position reporting and services
related to safety and regularity offlight. Thjs comml~njcation
involves one or more air traffic service administrations. This
term is used for purposes of address administration.
ATS interfacility data communication (AZDC). Automated
data exchange between air trafic 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. There are two ATS message handling services,
which are the AT$ messaging service and the ATPI passthrough
service.
ATS unit (ATSU). A generic term meaning variously, air
traffic control unit, flight information centre or air traffic
services reporting office.
Authorized path. A communication path that the administrator(~)
of the routing dornain(s) has pre-defined as
suitable for a given traffic type and category.
Automatic dependent surveillance (ADS). A surveillance
technique in which aircraft automatically provide, via a data
link, data derived from on-board navigation and
position-fixing systems, including aircraft identification,
four-dimensional position, and additional data as appropriate.
Automatic termifla1 information service (ATZS). The
automatic provision of current, mutine information to
arriving and departing aircraft throughout 24 hours or a
specified portion thereof.
Data link-automatic terminal information service
(D-ATIS). The provision of ATIS via data link.
Voice-automatic terminal information service (Voice-
ATZS). The provision of ATIS by means of
continuous and repetitive voice broadcasts.
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.
4/11/99
No. 74
4 ANNEX 10 - VOLUME 111
CHAPTER 4. AERONAUTICAL
MOBILE-SATELLITE SERVICE
4.1 . DEFLNITIONS AND DESCRIPTIONS
OF CHANNEL TYPES; GENERAL;
SYSTEM CAPABILITIES
4.1.1 Definitions and descriptions
rrf channel types
Adjacent beams. Beams which have the minimum spatial
separation in a given direction and whose conespanding
phase shifter states differ for at least one element.
Application. The ultimate use of an information system, as
distinguished from the system itself.
Aviation-BPSK (A-BPSK). The particular form of binary phase
shift keyed modlllation which is used in AMSS for channel
rates of 2.4, 1.2 and 0.6 -kbits/s. A-BPSK is a modulation
technique which maps,a "0" to a phase shift of -90" and "1"
to a phase shift of +90°. The phase-encoded A-BPSK data
stream is then filtered with a filter which satisfies the
amplitude and phase versus frequency limits defined by
Tables Al-1 and A1-2 in Appendix 1 to Chapter 4.
Aviation-QPSK {A-QPSKj. The particular form of offset
quaternary phase shift keyed modulation which is used in
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