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Attachment A to Part I1 .Gui dance material for communication systems ....................... 429
1 . VHF communications . . . . . . . . . . . . . . . . . . . . 429
2 . SELCAL system . . . . . . . . . . . . . . . . . . . . . . . 430
Foreword Annex 10 - Aeronautical Telecommunications
Table A. Amendments to Annex 10, Volume 111
Amendment Sourcefs)
Adopted
Effective
Applicable
70 Air Navigation Commission, Introduction of new Volume III and SARPs related to the Aeronautical
Third Meeting of the Aero- Mobile-Satellite Service (AMSS)
nautical Mobile Communications
Panel (AMCP)
7 1 Air Navigation Commission; SP Addition of specifications for the Mode S subnetwork of ATN;
COMlOPSl95 Divisional Meeting addition of material relating to the introduction of 8.33 HIz channel
(1995); fifth meeting of the spacing; changes to material related to the protection of air-ground
Secondary Surveillance Radar communications in the VHF band; addition of technical specifications
Improvements and Collision relating to the RF characteristics for the VHF digital link (VDL).
Avoidance Systems Panel
(SICASP); third meeting of the
Aeronautical Mobile
Communications Panel (AMCP)
72 Air Navigation Commission; Introduction of SARPs and guidance material for VHF digital link
fourth meeting of the (VDL); definition for VDL and deletion of obsolete material on
Aeronautical Mobile airlground data interchange.
Communications Panel (AMCP)
20 March 1995
24 July 1995
9 November 1995
12 March 1996
15 July 1996
7 November 1996
12 March 1997
21 July 1997
6 November 1997
6/11/97
No. 72
INTERNATIONAL STANDARDS AND
RECOMMENDED PRACTICES
CHAPTER 1. DEFINITIONS
Note I.- All references to "Radio Regulations" are to the Carrier-to-multipath ratio (C/M). The ratio of the carrier
Radio Regulatio~zsp ublished by the I~zternationulT elecomm~i- power received directly, i.c. without reflection, to the
nicatiorz Union. multipath power. i.e. carrier power received via reflection.
Note 2.- This Part qf Annex 10 includes Standards and
Recommended Practices for certain .forms of ~quipmelzfto r
communicariun systems. While the Contructing State will
determine the necessiQfor sper@c installations in accordance
with the conditions prescribed in the relevant Standard or
Recommended Practice, review ojLthe need for specific installation
and the formlilatron of ICAO opinion and recammendations
m Contracting States concerned, is carried out
periodically by Council, ordinarily on the basis of recommendations
of Regional Air Nnvigah'on Meetings (Doc 8144,
Directives to Regional Air Navigation Meetings and Rules of
Procedure fur their Conduct).
Carrier-to-noise density ratio (Urn. The ratio of the total
carrier power to the avcrage noise power in a 1 Hz bandwidth,
usually expressed in dBHz.
Channel rate. 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 rate accuracy. This is relative accuracy of the clock
to which the transmitted channel bits are synchronized. For
Note 3.- This chapter coritrrins general de9nitions relc- example, at a channel rate of 1.2 kbits/s, maximum error
of one part in lo6 implies the maximum allowed enror in
vant to comrnunicatiolz systems. Dejnitions specific to each of
the systems included in this volume are contained in the the clock is r1.2 x Hz.
relevant ~hapttrs.
Circuit mode. A configuration of the communications network
which gives the aipcarance to the application of a dedi-
Note 4.- Material on secondaq power si~pply and
guidance material corlcerrzirzg reliability and ovailubili~fo r cated transmission palh.
communication systems is contained in Annex 10, Volume I,
2.9 and Volume I, Attachment F: respectively. Doppler shift. The frequency shift observed at a receiver due
to any relative motion between transmitter and receiver.
Aeronautical telecommunication network (ATN). An
internetwork architecture that allows ground, air-ground End-to-end. Pertaining or relating Lo an entire communication
and avionic data subnetworks to interoperate by adopting path, typically from (I) the interface between the informacommon
interface services and protocols based on the tion source and the communication system at the trans-
International Organization for Standardization (ISO) Open mitting end to (2) the interface between the communica-
Systems Interconnection (OSI) reference model. tion system and the information user or processor or
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