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TO INTERNATIONAL AERONAUTICAL SPEECH
CIRCUIT SWITCHING AND SIGNALLING
Note.- Guidance material on aeronautical speech circuit
switching and signalling is contained in ICAO Circular 183.
4.1.1 The use of circuit switching and signalling to
provide point-to-point speech circuits to interconnect area
control centres not interconnected by dedicated cixcuits shall
be by agreement between the Administrations concerned.
4.1.2 The application of aeronautica1 speech circuit
switching and signalling shall be made on the basis of regional
air navigation agreements,
4.1.3 Recommendation.- Where implemented, aeronautical
speech circuit switching and signalling should
provide:
a) priori~a ccess;
b) autonzatic call-back;
c) conference calling;
d) dzrough switching facilities;
e) the capability of alternate routing, when necessaly and
feasible;
JI identification of originator for incoming calls, when
necessary and feasible; and
g) call fonvarding, when necessary and feasible.
Note 1.- Identij5carion of originator is done by analysis
of the originator's code which i.r transmitted on both
signalling systems R2 and No. 5.
Note 2.- Call forwarding ensures that calls to operating
positions which are temporarily not manned will be remuted
automatically to an appropriate operating position.
4.1.4 Recommendation.- The characteristics of signalling
tones used in aeronautical speech circuit switching and
signalling should conform to ITU CCITT Signalling System
No. 5 ot to ITU CCITT Signalling System R2 as appropriate.
Signalling tones on inrerregional trunks should conform to one
of these ITU CCIlT specifications as determined by agreement
between the Administrations concerned.
Note.- Details of ITU CC17T Signalling System No. 5 are
contained in C C m Yellow Book, Volume VI - Fascicle VI-2;
details of ITU CCI7T Signalling System R2 are contained in
CCITT Yellow Book, Volume VI - Fascicle VI-4.
4.1.5 Recommendation.- The characteristics of the
ringing tone, the busy tone and the congestion tone used in
aeronautical speech circuit switching and signalling should
conforrn to ITU CCITT Recommendation E.180.
Note.- Details of ITU CCITT Recommendation E.180 are
contained in CCUT Yellow Book, Volume II - Fascicle 11-2.
4.1.6 Recommendation.- The numberingplan used in
aeronautical speech circuit switching and signalling should
consist of six digits whereby the first two digits identify the
area, the third und fourth digits the control centre and thefifth
and sixth digits the working position or correspondent within
the control centre. Up to hvo additional digits muy be added
following the sixth digit to allow a larger number of positions
within a control centre to be uniquely addressed.
Note.- The area identifier mav be used to identify either
a countv or a group of countries.
4.1.7 Recommendation.- It .rhould not be necessary
to dial the area identifier code on calls between stations
sharing n common area identifiel:
ANNEX 10 - VOLUME I11
711 1/96
No. 71
CHAPTER 5. EMERGENCY LOCATOR TRANSMITTER (ELT)
FOR SEARCH AND RIESCUE
5.1 GENERAL 5.2.1.2 The emission from an ELT under normal
conditions and attitudes of the antenna shall be vertically
5.1.1 Until 1 January 2005, emergency locator transmitters polarized and essentially omnidirectional in the horizontal
shall operate either on both 406 MHz and 121.5 MHz or on plane.
121.5 MHz.
Note.- From I January 2000, ELTs opemting on 5.2.1.3 Over a period of 48 hours of continuous operation,
121.5 M H ~ will be to meet the impmved technical at an operating temperature of minus 20°C+ the peak effective
chmcteristics contained in 5.2.1.8. radiated power (PERP) shall at no time be less than 50 mW.
5.1.2 All installations of emergency locator transmitters 5.2.1.4 The type of emission shall be A3X. Any other
operating on 406 MHz shall meet the provisions of 5.3. type of modulation that meets the requirements of 5.2.1.5,
5.1.3 All installations of emergency locator transmitters 5.2.1.6 and 5.2.1.7 below may be used provided that it will not
operating on 121.5 MHz shall meet the provisions of 5.2. prejudice precise location of the beacon by homing equipment.
5.1.4 From 1 January 2005, emergency locator Nore.-- Some ELTs are equipped with an optional voice
transmitters shdl operate on 406 MHz and 121.5 MHz (A3E) in &tian the A3X e,niaion.
simultaneously.
5.1.5 All emergency locator transmitters installed on or 5.2.1.5 The carrier shall be amplitude modulated at a
after 1 January 2002 shall operate simultaneously on 406 MHz modulation factor of at least 0.85-
and 121.5 MHz.
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