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Introduction of material relating to the ATN; changes to specitkations 19 March 1998
of the Mode S subnetwork. 20 July 1998
5 November 1998
Introduction of: a) specifications for HF data link; and b) changes to 18 March 1999
the specifications for emergency locator transmitters. 19 July 1999
4 November 1999
Changes to the AMSS SARPs introducing a new antenna typc, a new 13 March 2000
voice channel type and enhanced provisions for interoperability 17 July 2000
among AMSS systems; changes to the VDL SARPs to reduce 2 November 2000
potenlial interference to current VHF voice cornmu.nication systems
caused by VDL transmitters; changes to the VBF voice communication
SARPs to enhance immunity to interfercncc from VDL
aansrnitters on board the same aircraft.
Aeronautical telecommunication network (ATN) system management, 12 March 200 1
security and directory services; removal of detailed material relating 16 July 2001
to CIDIN; integrated voice and data link system (VDL Mode 3); data I November 2001
link satisfying surveillance applications (VDL Mode 4); deletion of all
the provisions for VDL Mode 1; removal of the detailed technical
specifications for VDL Mode 2; aeronautical speech circuits; update
of references to the ITU Radio Regulations.
INTERNATIONAL STANDARDS AND
RECOMMENDED PRACTICES
CHAPTER 1. DEFINITIONS
Note 1.- Air! references to "Radio Regulations" are to the
Radio Regulations publislzed by the International Telecommunication
Union (ITU). Radio Regulations are amended from
time to time by the decisions embodied in the Final Acts of
World Radiocommunication Conferences held normally ever;v
Two to three years. Further information on the ITW processes
as they relate to aeronautical radio system frequency use is
contained in the Handbook on Radio Frequency Spectrum
Requirements for Civil Aviation including statement of
approved ICAO policies (Doc 9718).
Note 2.- This Part of Annex I0 includes Standards and
Aircraft earth station (AES). A mobile earth station in the
aeronautical mobile-satellite service located on board an
aircraft (see also "GES").
Bit error rate (BER). The number of bit errors in a sample
divided by the total number of bits in the sample, generally
averaged over many such samples.
Carrier-to-multipath ratio (C/M). The ratio of the carrier
power received directly, i.e. without reflection, to the
multipath power, i.e. carrier power received via reflection.
Recommended Practices for certain forms of equipment for Currier-to-noise densio ratio (C/N,j. The ratio of the total
communication systems. While the Contracting State will camer power to the average noise power in a 1 Hz
determine the necessity for specific installations in accordance bandwidth, usually expressed in dBHz.
with the conditions prescribed in the relevant Standard or
Recommended Practice, review of the need for speclfic
installarion und the formulation of ICAO opinion and
recommendutions to Contracting States concerned, is carried
out periodically by Council, ordinarily on the basis of
recommendations of Regional Air Navigation Meetings
(Doc 8144, Directives to Regional Air Navigation Meetings
and Rules of Procedure for their Conduct).
Note 3.- This chapter contains general dejinitions relevant
to communication systems. Definitions specific to each of the
system included in this volumc are contained in the relevant
chapters.
Channel rule. The rate at which bits are transmitted over the
RF channel. These bits include those bits used for framing
and error correction, as well as the information bits. For
burst transmission, the channel rate refers to the
instantaneous burst rate over the period of the burst.
Channel rnte accuracy. This is relative accuracy of the clock
to which the transmitted channel bits ale synchronized. For
example, at a channel ratc of 1.2 kbitsls, maximum error of
one part in lo6 imS l ies the maximum allowed error in the clock is 21.2 x 10- Hz.
N~~~ 4,- Material on power supply and Circuit mode. A configuration of the communications network
guidance material concernihg reliability and availabilizy for which gives the appearance to the application of a dedicated
communication systems is contained in Annex 10, Volume I, transmission path.
2.9 and Volume I, Attachment f; respectively.
Aeronautical telecommunication network (ATN). An
internetwork architecture that allows ground, air-ground
and avionic data subnetworks to interoperate by adopting
common interface services and protocols based on the
International Organizalion for Standardization (ISO) Open
Systems Interconnection (OSI) reference model.
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