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Avoidance Systems Panel
(SICASP); third meeting of the
Aeronautical Mobile
Communic;ltions Panel (AMCP)
Adopted
Effective
Applicable
20 March 1995
24 July 1995
9 November 1995
12 March 1996
15 July 1995
7 November 1996
7111196
No. 71
INTERNATIONAL STANDAIU)S AND
RECOMMENDED PRACTICES
CHAPTER 1.
Note I.- All references to "Radio Regulations" are to the
Radio Regulatio?zs published by the International Telecommunication
Union.
Note 2.- This Part of Annex 10 includes Starzdards and
Recommended Practices for certain fonns of equipment for
communication systems. While the Contracting State will
deternzine rhe necessity for specijic insrallations in accordance
with tlze conditions prescribed in the relevant Srundurd or
Recommended Practice, review of the need for specific insfaliution
arzd the fornulation of lCAO opinion and recommendations
to Contracting Stares concerned, is carried out
periodically by Council, ordinarily on the basis of recommendations
qf Regional Air Navigation Meetings (Doc 8144.
Directives to Regional Air Navigation Meetings and Rules of
Procedure for their Conduct).
Note 3.- This chupter contains general definitions relevant
to cornmzinication systems. Defilzitions specific ~o each of
the systems incllided in this volume ure contained in the
relevant chapters.
Note 4.- Material on secondaty power supply and
guidance muterial concenzing reliability and availability for
conzmu~licariun systems is contained in Annex 10. Volume l,
2.9 and Volume I, Attachment E respectively.
Aeronautical telecommunication network (AT2V). 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 Organization for Standardization (ISO) Open
Systems Interconnection (OSI) reference model.
Aircraft address. A unique combination of twenty-four bits
available for assignment to an aircraft for the purpose of
air-ground communications, navigation and surveillance.
Aircrafr 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 nunlber of bits in the sample,
generally averaged over many such samples.
DEFINITIONS
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.
Carrier-to-noise density ratio (C/iVJ. The ratio of the total
carrier power to the average noise power in a 1 Hz bandwidth,
usually expressed in &Hz.
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. he 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
example, at a charnel rate of 1.2 kbits/s, maximum trror
of one part in 10' implies the maximum allowed error in
the clock is k1.2 x Hz.
Circuit mode. A configuration of the communications network
which gives the appearance to the application of a dedicated
transmission path.
Doppler shift. The frequency shift observed at a receiver due
to any relative motion between transmitter and receiver.
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.
E~zd-userA. n ultimate source andor consumer of information.
Equi~lalentis otropically radiated power (e-ixp).T he product
of the power supplied to the antenna and the antenna gaill
in a given direction relative to an isotropic antenna
(absolute or isotropic gain).
Energy per symbol to noise density ratio (EiNJ. The ratio of
the average energy transmitted per channel symbol to the
average noise power in a 1 Hz bandwidth, usually
ANNEX 10 - VOLUME 111
Annex I0 - Aeronautical Telecommunications Volume ZII
expresstd in dB. For A-BPSK and A-QPSK, one channel
symbol refers to one channel bit.
Fmard error correction (FITC). The process of adding
redundant information to the transmitted signal in a
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